MUYANG GUO / INDEX

#Python

464 posts

2m

LintCode 971 Surplus Value Backpack - Hard

971. Surplus Value Backpack

· LintCode· Hard· Python
1m

LintCode 960 First Unique Number In Data Stream II - Medium

960. First Unique Number in Data Stream II

· LintCode· Medium· Python
1m

LintCode 92 Backpack - Medium

描述

· LintCode· Medium· Python
1m

LintCode 90 K Sum II - Medium

90. k Sum II

· LintCode· Medium· Python
2m

LintCode 89 K Sum - Hard

89. k Sum

· LintCode· Hard· Python
1m

LintCode 845 Greatest Common Divisor - Easy

845. Greatest Common Divisor

· LintCode· Easy· Python
1m

LintCode 843 Digits Flip - Medium

· LintCode· Medium· Python
2m

LintCode 841 String Replace - Hard

841. String Replace

· LintCode· Hard· Python
1m

LintCode 839 Merge Two Sorted Interval Lists - Easy

839. Merge Two Sorted Interval Lists

· LintCode· Easy· Python
7m

LintCode 816 Traveling Salesman Problem - Hard

816. Traveling Salesman Problem

· LintCode· Hard· Python
1m

LintCode 761 Smallest Subset - Medium

761. Smallest Subset

· LintCode· Medium· Python
2m

LintCode 752 Rogue Knight Sven - Medium

752. 流浪剑客斯温

· LintCode· Medium· Python
1m

LintCode 724 Minimum Partition - Medium

724. Minimum Partition

· LintCode· Medium· Python
1m

LintCode 685 First Unique Number In Data Stream - Medium

685. First Unique Number in Data Stream

· LintCode· Medium· Python
1m

LintCode 680 Split String - Medium

680. Split String

· LintCode· Medium· Python
1m

LintCode 654 Sparse Matrix Multiplication - Medium

654. Sparse Matrix Multiplication

· LintCode· Medium· Python
3m

LintCode 630 Knight Shortest Path II - Medium

630. Knight Shortest Path II

· LintCode· Medium· Python
1m

LintCode 628 Maximum Subtree - Easy

628. Maximum Subtree

· LintCode· Easy· Python
1m

LintCode 625 Partition Array II - Medium

625. Partition Array II

· LintCode· Medium· Python
1m

LintCode 612 K Closest Points - Medium

612. K Closest Points

· LintCode· Medium· Python
3m

LintCode 611 Knight Shortest Path-II - Medium

611. Knight Shortest Path

· LintCode· Medium· Python
1m

LintCode 610 Two Sum-Difference Equals To Target - Medium

610. Two Sum - Difference equals to target

· LintCode· Medium· Python
1m

LintCode 61 Search For A Range - Medium

61. Search for a Range

· LintCode· Medium· Python
1m

LintCode 609 Two Sum-Less Than Or Eqaul To Target - Medium

609. Two Sum - Less than or equal to target

· LintCode· Medium· Python
1m

LintCode 604 Window Sum - Easy

604. Window Sum

· LintCode· Easy· Python
1m

LintCode 6 Merge Two Sorted Arrays - Easy

6. 合并排序数组 II

· LintCode· Easy· Python
2m

LintCode 596 Minimum Subtree - Easy

596. Minimum Subtree

· LintCode· Easy· Python
1m

LintCode 585 Maximum Number In Mountain Sequence - Medium

585. Maximum Number in Mountain Sequence

· LintCode· Medium· Python
3m

LintCode 584 Drop Eggs II - Medium

584. Drop Eggs II

· LintCode· Medium· Python
2m

LintCode 578 Lowest Common Ancestor III - Medium

578. Lowest Common Ancestor III

· LintCode· Medium· Python
1m

LintCode 577 Merge K Sorted Interval Lists - Medium

577. Merge K Sorted Interval Lists

· LintCode· Medium· Python
2m

LintCode 563 Backpack V - Medium

描述

· LintCode· Medium· Python
1m

LintCode 560 Friendship Service - Easy

560. Friendship Service

· LintCode· Easy· Python
1m

LintCode 553 Two Sum-Closest To Target - Medium

533. Two Sum - Closest to target

· LintCode· Medium· Python
1m

LintCode 545 Top K Largest Numbers II - Medium

545. Top k Largest Numbers II

· LintCode· Medium· Python
2m

LintCode 538 Memcache - Medium

538. Memcache

· LintCode· Medium· Python
2m

LintCode 522 Tiny URLII - Medium

522. Tiny Url II

· LintCode· Medium· Python
1m

LintCode 521 Remove Duplicate Numbers In Array - Easy

521. Remove Duplicate Numbers in Array

· LintCode· Easy· Python
1m

LintCode 502 Mini Cassandra - Medium

502. Mini Cassandra

· LintCode· Medium· Python
1m

LintCode 494 Implement Stack By Two Queues - Easy

494. Implement Stack by Two Queues

· LintCode· Easy· Python
1m

LintCode 492 Implement Queue By Linked List - Easy

492. Implement Queue by Linked List

· LintCode· Easy· Python
1m

LintCode 49 Sort Letters By Case - Medium

49. Sort Letters by Case

· LintCode· Medium· Python
1m

LintCode 474 Lowest Common Ancestor II - Easy

474. Lowest Common Ancestor II

· LintCode· Easy· Python
3m

LintCode 464 Sort Integers II - Easy

464. 整数排序 II

· LintCode· Easy· Python
1m

LintCode 462 Total Occurrence Of Target - Easy

462. Total Occurrence of Target

· LintCode· Easy· Python
2m

LintCode 461 Kth Smallest Numbers In Unsorted Array - Medium

Find the kth smallest number in an unsorted integer array.

· LintCode· Medium· Python
2m

LintCode 460 Find K Closest Elements - Medium

460. Find K Closest Elements

· LintCode· Medium· Python
1m

LintCode 458 Last Position Of Target - Easy

458. Last Position of Target

· LintCode· Easy· Python
2m

LintCode 447 Search In A Big Sorted Array - Medium

447. Search in a Big Sorted Array

· LintCode· Medium· Python
1m

LintCode 443 Two Sum-Greater Than Target - Medium

443. Two Sum - Greater than target

· LintCode· Medium· Python
2m

LintCode 440 Backpack III - Medium

给定 n 种物品, 每种物品都有无限个. 第 i 个物品的体积为 A[i], 价值为 V[i].

· LintCode· Medium· Python
3m

LintCode 437 Copy Books - Medium

给定 n 本书, 第 i 本书的页数为 pages[i]. 现在有 k 个人来复印这些书籍, 而每个人只能复印编号连续的一段的书, 比如一个人可以复印 pages[0], pages[1], pages[2], 但是不可以只复印 pages[0], pages[2], pa…

· LintCode· Medium· Python
1m

LintCode 40 Implement Queue By Two Stacks - Medium

40. Implement Queue by Two Stacks

· LintCode· Medium· Python
1m

LintCode 396 Coin In Line III - Hard

有 n 个硬币排成一条线, 第 i 枚硬币的价值为 values[i].

· LintCode· Hard· Python
1m

LintCode 394 Coin In Line - Medium

描述

· LintCode· Medium· Python
1m

LintCode 39 Recover Rotated Sorted Array - Easy

39. Recover Rotated Sorted Array

· LintCode· Easy· Python
1m

LintCode 38 Search A2 D Matrix II - Medium

38. Search a 2D Matrix II

· LintCode· Medium· Python
1m

LintCode 373 Partition Arrayby Oddand Even - Easy

373. Partition Array by Odd and Even

· LintCode· Easy· Python
1m

LintCode 254 Drop Eggs - Easy

254. Drop Eggs

· LintCode· Easy· Python
1m

LintCode 249 Count Smaller Number Before Itself - Hard

Description

· LintCode· Hard· Python
1m

LintCode 235 Prime Factorization - Easy

235. Prime Factorization

· LintCode· Easy· Python
1m

LintCode 211 String Permutation - Easy

211. String Permutation

· LintCode· Easy· Python
1m

LintCode 197 Permutation Index - Medium

197. Permutation Index

· LintCode· Medium· Python
1m

LintCode 1870 Number Of Substrings With All Zeroes - Medium

1870. number of substrings with all zeroes

· LintCode· Medium· Python
2m

LintCode 183 Wood Cut - Hard

183. Wood Cut

· LintCode· Hard· Python
1m

LintCode 1790 Rotate String II - Easy

1790. Rotate String II

· LintCode· Easy· Python
1m

LintCode 1479 Can Reach The Endpoint - Easy

1479. Can Reach The Endpoint

· LintCode· Easy· Python
1m

LintCode 144 Interleaving Positive And Negative Numbers - Medium

144. Interleaving Positive and Negative Numbers

· LintCode· Medium· Python
1m

LintCode 143 Sort Colors II - Medium

· LintCode· Medium· Python
1m

LintCode 140 Fast Power - Medium

140. Fast Power

· LintCode· Medium· Python
1m

LintCode 14 First Position Of Target - Easy

14. First Position of Target

· LintCode· Easy· Python
1m

LintCode 1375 Substring With At Least K Distinct Characters - Medium

1375. Substring With At Least K Distinct Characters

· LintCode· Medium· Python
1m

LintCode 1343 Sum Of Two Strings - Easy

1343. Sum of Two Strings

· LintCode· Easy· Python
1m

LintCode 1331 English Software - Easy

1331. English Software

· LintCode· Easy· Python
2m

LintCode 130 Heapify - Medium

130. Heapify

· LintCode· Medium· Python
2m

LintCode 129 Rehashing - Medium

129. Rehashing

· LintCode· Medium· Python
1m

LintCode 128 Hash Function - Easy

128. Hash Function

· LintCode· Easy· Python
1m

LintCode 127 Topological Sorting - Medium

127. Topological Sorting

· LintCode· Medium· Python
1m

LintCode 125 Backpack II - Medium

有 n 个物品和一个大小为 m 的背包. 给定数组 A 表示每个物品的大小和数组 V 表示每个物品的价值.

· LintCode· Medium· Python
1m

LintCode 120 Word Ladder - Hard

120. Word Ladder

· LintCode· Hard· Python
2m

LintCode 1166 Recommended Results Are Scattered - Easy

1166. Recommended Results are Scattered

· LintCode· Easy· Python
1m

LintCode 10 String Permutations II - Medium

10. String Permutation II

· LintCode· Medium· Python
1m

LeetCode 994 Rotting Oranges - Medium

994. Rotting Oranges -- Medium

· LeetCode· Medium· Python
1m

LeetCode 991 Broken Calculator - Medium

991. Broken Calculator -- Medium

· LeetCode· Medium· Python
2m

LeetCode 987 Vertical Order Traversal Of A Binary Tree - Medium

987. Vertical Order Traversal of a Binary Tree -- Medium

· LeetCode· Medium· Python
1m

LeetCode 986 Interval List Intersections - Medium

986. Interval List Intersections

· LeetCode· Medium· Python
2m

LeetCode 983 Minimum Cost For Tickets - Medium

983. Minimum Cost For Tickets -- Medium

· LeetCode· Medium· Python
2m

LeetCode 981 Time Based Key Value Store - Medium

981. Time Based Key-Value Store -- Medium

· LeetCode· Medium· Python
1m

LeetCode 98 Valid Binary Search Tree - Medium

98. Validate Binary Search Tree -- Medium

· LeetCode· Medium· Python
1m

LeetCode 977 Squares Of A Sorted Array - Easy

Given an array of integers A sorted in non-decreasing order, return an array of the squares of each number, also in sorted non-decreasing…

· LeetCode· Easy· Python
1m

LeetCode 974 Subarray Sums Divisible By K - Medium

974. Subarray Sums Divisible by K -- Medium

· LeetCode· Medium· Python
2m

LeetCode 973 K Closest Points To Origin - Medium

973. K Closest Points to Origin -- Medium

· LeetCode· Medium· Python
2m

LeetCode 97 Interleaving String - Hard

Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2.

· LeetCode· Hard· Python
2m

LeetCode 969 Pancake Sorting - Medium

969. Pancake Sorting

· LeetCode· Medium· Python
1m

LeetCode 96 Unique Binary Search Trees - Medium

96. Unique Binary Search Trees -- Medium

· LeetCode· Medium· Python
2m

LeetCode 958 Check Completeness Of A Binary Tree - Medium

958. Check Completeness of a Binary Tree -- Medium

· LeetCode· Medium· Python
2m

LeetCode 950 Reveal Cards In Increasing Order - Medium

950. Reveal Cards In Increasing Order -- Medium

· LeetCode· Medium· Python
1m

LeetCode 95 Unique Binary Search Trees II - Medium

95. Unique Binary Search Trees II -- Medium

· LeetCode· Medium· Python
1m

LeetCode 94 Binary Tree Inorder Traversal - Medium

94. Binary Tree Inorder Traversal

· LeetCode· Medium· Python
1m

LeetCode 937 Reorder Data In Log Files - Easy

937. Reorder Data in Log Files

· LeetCode· Easy· Python
1m

LeetCode 931 Minimum Falling Path Sum - Medium

931. Minimum Falling Path Sum -- Medium

· LeetCode· Medium· Python
2m

LeetCode 924 Minimize Malware Spread - Hard

924. Minimize Malware Spread -- Hard

· LeetCode· Hard· Python
2m

LeetCode 92 Reverse Linked List II - Medium

92. Reverse Linked List II

· LeetCode· Medium· Python
1m

LeetCode 914 X Of A Kind In A Deck Of Cards - Easy

914. X of a Kind in a Deck of Cards -- Easy

· LeetCode· Easy· Python
3m

LeetCode 912 Sort An Array - Medium

Given an array of integers nums, sort the array in ascending order.

· LeetCode· Medium· Python
1m

LeetCode 91 Decode Ways - Medium

A message containing letters from A-Z is being encoded to numbers using the following mapping:

· LeetCode· Medium· Python
1m

LeetCode 905 Sort Array By Parity - Easy

905. Sort Array By Parity

· LeetCode· Easy· Python
1m

LeetCode 889 Construct Binary Tree From Preorder And Postorder Traversal - Medium

889. Construct Binary Tree from Preorder and Postorder Traversal

· LeetCode· Medium· Python
2m

LeetCode 887 Super Egg Drop - Hard

887. Super Egg Drop

· LeetCode· Hard· Python
2m

LeetCode 883 Find And Replace In String - Medium

833. Find And Replace in String

· LeetCode· Medium· Python
1m

LeetCode 881 Boats To Save People - Medium

881. Boats to Save People -- Medium

· LeetCode· Medium· Python
1m

LeetCode 88 Merge Sorted Array - Easy

Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array.

· LeetCode· Easy· Python
1m

LeetCode 870 Advantage Shuffle - Medium

870. Advantage Shuffle -- Medium

· LeetCode· Medium· Python
3m

LeetCode 87 Scramble String - Hard

Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively.

· LeetCode· Hard· Python
2m

LeetCode 864 Shortest Path To Get All Keys - Hard

864. Shortest Path to Get All Keys -- Hard

· LeetCode· Hard· Python
2m

LeetCode 863 All Nodes Distance K In Binary Tree - Medium

863. All Nodes Distance K in Binary Tree -- Medium

· LeetCode· Medium· Python
1m

LeetCode 86 Partition List - Medium

86. Partition List

· LeetCode· Medium· Python
1m

LeetCode 856 Score Of Parentheses - Medium

856. Score of Parentheses -- Medium

· LeetCode· Medium· Python
2m

LeetCode 853 Car Fleet - Medium

853. Car Fleet -- Medium

· LeetCode· Medium· Python
1m

LeetCode 852 Peak Index In A Mountain Array - Easy

852. Peak Index in a Mountain Array

· LeetCode· Easy· Python
1m

LeetCode 850 Rectangle Area II - Hard

850. Rectangle Area II -- Hard

· LeetCode· Hard· Python
1m

LeetCode 85 Maximal Rectangle - Hard

85. Maximal Rectangle -- Hard

· LeetCode· Hard· Python
1m

LeetCode 837 New21 Game - Medium

837. New 21 Game -- Medium

· LeetCode· Medium· Python
1m

LeetCode 83 Remove Duplicates From Sorted List - Easy

83. Remove Duplicates from Sorted List

· LeetCode· Easy· Python
1m

LeetCode 829 Consecutive Numbers Sum - Hard

829. Consecutive Numbers Sum -- Hard

· LeetCode· Hard· Python
2m

LeetCode 827 Making A Large Island - Hard

827. Making A Large Island -- Hard

· LeetCode· Hard· Python
1m

LeetCode 822 Card Flipping Game - Medium

822. Card Flipping Game -- Medium

· LeetCode· Medium· Python
1m

LeetCode 82 Remove Duplicates From Sorted List II - Medium

82. Remove Duplicates from Sorted List II

· LeetCode· Medium· Python
2m

LeetCode 819 Most Common Word - Easy

819. Most Common Word

· LeetCode· Easy· Python
2m

LeetCode 811 Subdomain Visits - Easy

811. Subdomain Visit Count -- Easy

· LeetCode· Easy· Python
1m

LeetCode 796 Rotate String - Easy

796. Rotate String -- Easy

· LeetCode· Easy· Python
1m

LeetCode 79 Word Search - Medium

79. Word Search -- Medium

· LeetCode· Medium· Python
1m

LeetCode 786 Kth Smallest Prime Fraction - Hard

786. K-th Smallest Prime Fraction -- Hard

· LeetCode· Hard· Python
2m

LeetCode 785 Is Graph Bipatite - Medium

785. Is Graph Bipartite? -- Medium

· LeetCode· Medium· Python
1m

LeetCode 78 Subsets - Medium

17. Subsets

· LeetCode· Medium· Python
2m

LeetCode 777 Swap Adjacent In LR String - Medium

777. Swap Adjacent in LR String -- Medium

· LeetCode· Medium· Python
2m

LeetCode 772 Basic Calculator III - Hard

772. Basic Calculator III -- Hard

· LeetCode· Hard· Python
1m

LeetCode 771 Jewels And Stones - Easy

You're given strings J representing the types of stones that are jewels, and S representing the stones you have. Each character in S is …

· LeetCode· Easy· Python
1m

LeetCode 767 Reorganize String - Medium

767. Reorganize String -- Medium

· LeetCode· Medium· Python
1m

LeetCode 763 Partition Labels - Medium

763. Partition Labels

· LeetCode· Medium· Python
1m

LeetCode 76 Minimum Window Substring - Hard

76. Minimum Window Substring -- Hard

· LeetCode· Hard· Python
2m

LeetCode 759 Employee Free Time - Hard

759. Employee Free Time -- Hard

· LeetCode· Hard· Python
2m

LeetCode 75 Sort Colors - Medium

Given an array with n objects colored red, white or blue, sort them in-place so that objects of the same color are adjacent, with the col…

· LeetCode· Medium· Python
2m

LeetCode 741 Cherry Pickup - Hard

741. Cherry Pickup -- Hard

· LeetCode· Hard· Python
1m

LeetCode 74 Search A2 D Matrix - Medium

74. Search a 2D Matrix

· LeetCode· Medium· Python
1m

LeetCode 735 Asteroid Collision - Medium

735. Asteroid Collision -- Medium

· LeetCode· Medium· Python
2m

LeetCode 726 Number Of Atoms - Hard

726. Number of Atoms -- Hard

· LeetCode· Hard· Python
2m

LeetCode 723 Candy Crush - Medium

723. Candy Crush -- Medium

· LeetCode· Medium· Python
2m

LeetCode 72 Edit Distance - Hard

Given two words word1 and word2, find the minimum number of operations required to convert word1 to word2.

· LeetCode· Hard· Python
2m

LeetCode 716 Max Stack - Easy

716. Max Stack

· LeetCode· Easy· Python
1m

LeetCode 713 Subarray Product Less Than K - Medium

713. Subarray Product Less Than K -- Medium

· LeetCode· Medium· Python
2m

LeetCode 706 Design Hash Map - Easy

706. Design HashMap -- Easy

· LeetCode· Easy· Python
1m

LeetCode 704 Binary Search - Easy

Given a sorted (in ascending order) integer array nums of n elements and a target value, write a function to search target in nums. If ta…

· LeetCode· Easy· Python
1m

LeetCode 703 Kth Largest Element In A Stream - Easy

703. Kth Largest Element in a Stream

· LeetCode· Easy· Python
1m

LeetCode 70 Climbing Stairs - Easy

70. Climbing Stairs -- Easy

· LeetCode· Easy· Python
1m

LeetCode 698 Partition To K Equal Sum Subsets - Medium

698. Partition to K Equal Sum Subsets -- Medium

· LeetCode· Medium· Python
3m

LeetCode 697 Degree Of An Array - Easy

· LeetCode· Easy· Python
2m

LeetCode 695 Max Area Of Island - Medium

695. Max Area of Island -- Medium

· LeetCode· Medium· Python
1m

LeetCode 692 Top K Frequent Words - Medium

692. Top K Frequent Words

· LeetCode· Medium· Python
1m

LeetCode 682 Maximum Product Of Three Numbers - Easy

628. Maximum Product of Three Numbers -- Easy

· LeetCode· Easy· Python
1m

LeetCode 681 Next Closest Time - Medium

681. Next Closest Time -- Medium

· LeetCode· Medium· Python
1m

LeetCode 680 Valid Palindrome II - Easy

Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome.

· LeetCode· Easy· Python
2m

LeetCode 68 Text Justification - Hard

68. Text Justification -- Hard

· LeetCode· Hard· Python
2m

LeetCode 679 24 Game - Hard

679. 24 Game -- Hard

· LeetCode· Hard· Python
3m

LeetCode 674 Longest Continuous Increasing Subsequence - Easy

Given an unsorted array of integers, find the length of longest continuous increasing subsequence (subarray).

· LeetCode· Easy· Python
1m

LeetCode 670 Maximum Swap - Medium

670. Maximum Swap -- Medium

· LeetCode· Medium· Python
1m

LeetCode 67 Add Binary - Easy

67. Add Binary -- Easy

· LeetCode· Easy· Python
2m

LeetCode 662 Maximum Width Of Binary Tree - Medium

662. Maximum Width of Binary Tree -- Medium

· LeetCode· Medium· Python
1m

LeetCode 66 Plus One - Easy

66. Plus One

· LeetCode· Easy· Python
1m

LeetCode 658 Find K Closest Elements - Medium

658. Find K Closest Elements

· LeetCode· Medium· Python
1m

LeetCode 647 Palindromic Substrings - Medium

647. Palindromic Substrings

· LeetCode· Medium· Python
2m

LeetCode 64 Minimum Path Sum - Medium

Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers alo…

· LeetCode· Medium· Python
2m

LeetCode 63 Unique Paths II - Medium

A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below).

· LeetCode· Medium· Python
2m

LeetCode 621 Task Scheduler - Medium

621. Task Scheduler -- Medium

· LeetCode· Medium· Python
2m

LeetCode 62 Unique Paths - Medium

A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below).

· LeetCode· Medium· Python
1m

LeetCode 611 Valid Triangle Number - Medium

611. Valid Triangle Number

· LeetCode· Medium· Python
1m

LeetCode 61 Rotate List - Medium

61. Rotate List -- Medium

· LeetCode· Medium· Python
1m

LeetCode 589 N-ary Tree Preorder Traversal - Easy

589. N-ary Tree Preorder Traversal -- Easy

· LeetCode· Easy· Python
2m

LeetCode 582 Kill Process - Medium

582. Kill Process -- Medium

· LeetCode· Medium· Python
2m

LeetCode 581 Shortest Unsorted Continuous Subarray - Easy

581. Shortest Unsorted Continuous Subarray

· LeetCode· Easy· Python
1m

LeetCode 58 Length Of Last Word - Easy

58. Length of Last Word

· LeetCode· Easy· Python
1m

LeetCode 567 Permutation In String - Medium

567. Permutation in String -- Medium

· LeetCode· Medium· Python
2m

LeetCode 561 Array Partition I - Easy

Given an array of 2n integers, your task is to group these integers into n pairs of integer, say (a1, b1), (a2, b2), ..., (an, bn) which …

· LeetCode· Easy· Python
1m

LeetCode 56 Merge Intervals - Medium

56. Merge Intervals

· LeetCode· Medium· Python
2m

LeetCode 55 Jump Game - Medium

Given an array of non-negative integers, you are initially positioned at the first index of the array.

· LeetCode· Medium· Python
1m

LeetCode 547 Friend Circles - Medium

547. Friend Circles

· LeetCode· Medium· Python
2m

LeetCode 545 Boundary Of Binary Tree - Medium

545. Boundary of Binary Tree -- Medium

· LeetCode· Medium· Python
1m

LeetCode 543 Diameter Of Binary Tree - Easy

543. Diameter of Binary Tree -- Easy

· LeetCode· Easy· Python
1m

LeetCode 542 01 Matrix - Medium

542. 01 Matrix

· LeetCode· Medium· Python
1m

LeetCode 535 Encode And Decode Tiny URL - Medium

535. Encode and Decode TinyURL

· LeetCode· Medium· Python
3m

LeetCode 529 Minesweeper - Medium

529. Minesweeper -- Medium

· LeetCode· Medium· Python
2m

LeetCode 528 Random Pick With Weight - Medium

528. Random Pick with Weight -- Medium

· LeetCode· Medium· Python
1m

LeetCode 526 Beautiful Arrangement - Medium

526. Beautiful Arrangement

· LeetCode· Medium· Python
1m

LeetCode 523 Continuous Subarray Sum - Medium

523. Continuous Subarray Sum -- Medium

· LeetCode· Medium· Python
1m

LeetCode 52 N-Queens II - Hard

52. N-Queens II

· LeetCode· Hard· Python
1m

LeetCode 518 Coin Change II - Medium

518. Coin Change 2 -- Medium

· LeetCode· Medium· Python
2m

LeetCode 516 Longest Palindromic Subsequence - Medium

516. Longest Palindromic Subsequence

· LeetCode· Medium· Python
2m

LeetCode 51 N-Queens - Hard

51. N-Queens

· LeetCode· Hard· Python
1m

LeetCode 509 Fibonacci Number - Easy

The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequence, such that each number is the sum of the two …

· LeetCode· Easy· Python
1m

LeetCode 500 Keyboard Row - Easy

500. Keyboard Row -- Easy

· LeetCode· Easy· Python
1m

LeetCode 50 Pow(x,n) - Medium

50. Pow(x, n)

· LeetCode· Medium· Python
1m

LeetCode 493 Reverse Pairs - Hard

493. Reverse Pairs -- Hard

· LeetCode· Hard· Python
1m

LeetCode 49 Group Anagrams - Medium

Given an array of strings, group anagrams together.

· LeetCode· Medium· Python
1m

LeetCode 485 Max Consecutive Ones - Easy

Given a binary array, find the maximum number of consecutive 1s in this array.

· LeetCode· Easy· Python
1m

LeetCode 48 Rotate Image - Medium

48. Rotate Image

· LeetCode· Medium· Python
2m

LeetCode 474 Onesand Zeroes - Medium

Given an array, strs, with strings consisting of only 0s and 1s. Also two integers m and n.

· LeetCode· Medium· Python
1m

LeetCode 470 Implement Rand10()Using Rand7() - Medium

470. Implement Rand10() Using Rand7() -- Medium

· LeetCode· Medium· Python
1m

LeetCode 47 Permutations II - Medium

47. Permutations II

· LeetCode· Medium· Python
2m

LeetCode 465 Optimal Account Balancing - Hard

465. Optimal Account Balancing -- Hard

· LeetCode· Hard· Python
2m

LeetCode 463 Island Perimeter - Easy

463. Island Perimeter -- Easy

· LeetCode· Easy· Python
1m

LeetCode 454 4 Sum II - Medium

454. 4Sum II

· LeetCode· Medium· Python
1m

LeetCode 451 Sort Characters By Frequency - Medium

451. Sort Characters By Frequency -- Medium

· LeetCode· Medium· Python
2m

LeetCode 450 Delete Node In ABST - Medium

450. Delete Node in a BST -- Medium

· LeetCode· Medium· Python
1m

LeetCode 449 Serialize And Deserialize BST - Medium

449. Serialize and Deserialize BST

· LeetCode· Medium· Python
1m

LeetCode 448 Find All Numbers Disappered In An Array - Easy

448. Find All Numbers Disappeared in an Array -- Easy

· LeetCode· Easy· Python
2m

LeetCode 445 Add Two Numbers II - Medium

445. Add Two Numbers II -- Medium

· LeetCode· Medium· Python
1m

LeetCode 441 Arranging Coins - Easy

441. Arranging Coins -- Easy

· LeetCode· Easy· Python
1m

LeetCode 440 Kth Smallest In Lexicographical Order - Hard

440. K-th Smallest in Lexicographical Order -- Hard

· LeetCode· Hard· Python
3m

LeetCode 44 Wildcard Mathcing - Hard

Given an input string (s) and a pattern (p), implement wildcard pattern matching with support for '?' and '*'.

· LeetCode· Hard· Python
1m

LeetCode 437 Path Sum III - Medium

437. Path Sum III -- Medium

· LeetCode· Medium· Python
2m

LeetCode 430 Flatten A Multilevel Doubly Linked List - Medium

430. Flatten a Multilevel Doubly Linked List -- Medium

· LeetCode· Medium· Python
1m

LeetCode 43 Multiply Strings - Medium

43. Multiply Strings -- Medium

· LeetCode· Medium· Python
2m

LeetCode 424 Longest Repeating Character Replacement - Medium

424. Longest Repeating Character Replacement

· LeetCode· Medium· Python
1m

LeetCode 42 Tapping Rain Water - Hard

42. Trapping Rain Water

· LeetCode· Hard· Python
2m

LeetCode 417 Pacific Atlantic Water Flow - Medium

417. Pacific Atlantic Water Flow -- Medium

· LeetCode· Medium· Python
1m

LeetCode 415 Add Strings - Easy

415. Add Strings -- Easy

· LeetCode· Easy· Python
1m

LeetCode 412 Fizz Buzz - Easy

412. Fizz Buzz -- Easy

· LeetCode· Easy· Python
1m

LeetCode 410 Split Array Largest Sum - Hard

410. Split Array Largest Sum -- Hard

· LeetCode· Hard· Python
1m

LeetCode 41 First Missing Positive - Hard

41. First Missing Positive

· LeetCode· Hard· Python
2m

LeetCode 409 Longest Palindrome - Easy

Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those …

· LeetCode· Easy· Python
1m

LeetCode 407 Trapping Rain Water II - Hard

407. Trapping Rain Water II -- Hard

· LeetCode· Hard· Python
2m

LeetCode 406 Queue Reconstruction By Height - Medium

406. Queue Reconstruction by Height -- Medium

· LeetCode· Medium· Python
2m

LeetCode 403 Frog Jump - Hard

403. Frog Jump -- Hard

· LeetCode· Hard· Python
1m

LeetCode 402 Remove K Digits - Medium

402. Remove K Digits -- Medium

· LeetCode· Medium· Python
1m

LeetCode 40 Combination Sum II - Medium

40. Combination Sum II

· LeetCode· Medium· Python
2m

LeetCode 398 Evaluate Division - Medium

399. Evaluate Division -- Medium

· LeetCode· Medium· Python
2m

LeetCode 395 Longest Substring With At Least K Repeating Characters - Medium

395. Longest Substring with At Least K Repeating Characters -- Medium

· LeetCode· Medium· Python
1m

LeetCode 394 Decode String - Medium

394. Decode String -- Medium

· LeetCode· Medium· Python
1m

LeetCode 390 Elimination Game - Medium

390. Elimination Game -- Medium

· LeetCode· Medium· Python
1m

LeetCode 39 Combination Sum - Medium

39. Combination Sum

· LeetCode· Medium· Python
1m

LeetCode 389 Find The Difference - Easy

389. Find the Difference -- Easy

· LeetCode· Easy· Python
1m

LeetCode 387 First Unique Character In A String - Easy

387. First Unique Character in a String

· LeetCode· Easy· Python
1m

LeetCode 386 Lexicographical Numbers - Medium

386. Lexicographical Numbers -- Medium

· LeetCode· Medium· Python
1m

LeetCode 384 Shuffle An Array - Medium

384. Shuffle an Array -- Medium

· LeetCode· Medium· Python
1m

LeetCode 383 Ransom Note - Easy

Given an arbitrary ransom note string and another string containing letters from all the magazines, write a function that will return tru…

· LeetCode· Easy· Python
2m

LeetCode 380 Insert Delete Get Random O(1) - Medium

380. Insert Delete GetRandom O(1)

· LeetCode· Medium· Python
1m

LeetCode 38 Count And Say - Easy

38. Count and Say

· LeetCode· Easy· Python
1m

LeetCode 378 Kth Smallest Element In A Sorted Matrix - Medium

378 Kth Smallest Element in a Sorted Matrix

· LeetCode· Medium· Python
1m

LeetCode 377 Combination Sum IV - Medium

Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive in…

· LeetCode· Medium· Python
3m

LeetCode 37 Suudku Solver - Hard

37. Sudoku Solver

· LeetCode· Hard· Python
1m

LeetCode 363 Max Sum Of Rectangle No Larger Than K - Hard

363. Max Sum of Rectangle No Larger Than K -- Hard

· LeetCode· Hard· Python
1m

LeetCode 361 Bomb Enemy - Medium

· LeetCode· Medium· Python
2m

LeetCode 36 Valid Sudoku - Medium

36. Valid Sudoku -- Medium

· LeetCode· Medium· Python
3m

LeetCode 355 Design Twitter - Medium

355. Design Twitter

· LeetCode· Medium· Python
1m

LeetCode 354 Russian Doll Envelopes - Hard

You have a number of envelopes with widths and heights given as a pair of integers (w, h). One envelope can fit into another if and only …

· LeetCode· Hard· Python
2m

LeetCode 350 Intersection Of Two Arrays II - Easy

350. Intersection of Two Arrays II -- Easy

· LeetCode· Easy· Python
1m

LeetCode 35 Search Insert Position - Easy

35. Search Insert Position

· LeetCode· Easy· Python
1m

LeetCode 349 Intersection Of Two Arrays - Easy

349. Intersection of Two Arrays

· LeetCode· Easy· Python
2m

LeetCode 347 Top K Frequent Elements - Medium

347. Top K Frequent Elements -- Medium

· LeetCode· Medium· Python
1m

LeetCode 346 Moving Average From Data Stream - Easy

346. Moving Average from Data Stream

· LeetCode· Easy· Python
1m

LeetCode 344 Reverse String - Easy

Write a function that reverses a string. The input string is given as an array of characters char[].

· LeetCode· Easy· Python
1m

LeetCode 340 Longest Substring With At Most K Distinct Characters - Hard

340. Longest Substring with At Most K Distinct Characters

· LeetCode· Hard· Python
1m

LeetCode 34 Find First And Last Position Of Element In Sorted Array - Medium

34. Find First and Last Position of Element in Sorted Array

· LeetCode· Medium· Python
1m

LeetCode 338 Counting Bits - Medium

Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary represe…

· LeetCode· Medium· Python
2m

LeetCode 336 Palindrome Pairs - Hard

336. Palindrome Pairs

· LeetCode· Hard· Python
1m

LeetCode 33 Search In Rotated Sorted Array - Medium

33. Search in Rotated Sorted Array

· LeetCode· Medium· Python
2m

LeetCode 329 Longest Increasing Path In A Matrix - Hard

329. Longest Increasing Path in a Matrix -- Hard

· LeetCode· Hard· Python
1m

LeetCode 325 Maximum Size Subarray Sum Equals K - Medium

325. Maximum Size Subarray Sum Equals k

· LeetCode· Medium· Python
1m

LeetCode 323 Number Of Connected Components In An Undirected Graph - Medium

323. Number of Connected Components in an Undirected Graph -- Medium

· LeetCode· Medium· Python
1m

LeetCode 322 Coin Change - Medium

· LeetCode· Medium· Python
1m

LeetCode 320 Generalized Abbreviation - Medium

320. Generalized Abbreviation -- Medium

· LeetCode· Medium· Python
1m

LeetCode 32 Longest Valid Parentheses - Hard

32. Longest Valid Parentheses -- Hard

· LeetCode· Hard· Python
2m

LeetCode 317 Shortest Distance From All Buildings - Hard

317. Shortest Distance from All Buildings -- Hard

· LeetCode· Hard· Python
1m

LeetCode 316 Remove Duplicate Letters - Medium

316. Remove Duplicate Letters -- Medium

· LeetCode· Medium· Python
2m

LeetCode 314 Binary Tree Vertical Order Traversal - Medium

314. Binary Tree Vertical Order Traversal -- Medium

· LeetCode· Medium· Python
2m

LeetCode 312 Burst Balloons - Hard

Given n balloons, indexed from 0 to n-1. Each balloon is painted with a number on it represented by array nums. You are asked to burst al…

· LeetCode· Hard· Python
1m

LeetCode 31 Next Permutation - Medium

31. Next Permutation

· LeetCode· Medium· Python
2m

LeetCode 305 Number Of Islands II - Hard

305. Number of Islands II -- Hard

· LeetCode· Hard· Python
1m

LeetCode 302 Smallest Rectangle Enclosing Black Pixels - Hard

302. Smallest Rectangle Enclosing Black Pixels

· LeetCode· Hard· Python
2m

LeetCode 301 Remove Invalid Parentheses - Hard

301. Remove Invalid Parentheses -- Hard

· LeetCode· Hard· Python
1m

LeetCode 300 Longest Increasing Subsequence - Medium

Given an unsorted array of integers, find the length of longest increasing subsequence.

· LeetCode· Medium· Python
2m

LeetCode 297 Serialize And Deserialize Binary Tree - Hard

297. Serialize and Deserialize Binary Tree

· LeetCode· Hard· Python
1m

LeetCode 295 Find Median From Data Stream - Hard

295. Find Median from Data Stream -- Hard

· LeetCode· Hard· Python
1m

LeetCode 292 Nim Game - Easy

292. Nim Game -- Easy

· LeetCode· Easy· Python
1m

LeetCode 291 Word Pattern II - Hard

291. Word Pattern II

· LeetCode· Hard· Python
1m

LeetCode 29 Divide Two Integers - Medium

29. Divide Two Integers

· LeetCode· Medium· Python
1m

LeetCode 286 Walls And Gates - Medium

286. Walls and Gates -- Medium

· LeetCode· Medium· Python
1m

LeetCode 283 Move Zeros - Easy

283. Move Zeroes

· LeetCode· Easy· Python
1m

LeetCode 282 Expression Add Operators - Hard

282. Expression Add Operators -- Hard

· LeetCode· Hard· Python
2m

LeetCode 28 Implementstr Str() - Easy

Implement strStr().

· LeetCode· Easy· Python
1m

LeetCode 279 Perfect Squares - Medium

Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, ...) which sum to n.

· LeetCode· Medium· Python
1m

LeetCode 278 First Bad Version - Easy

278. First Bad Version

· LeetCode· Easy· Python
1m

LeetCode 273 Integer To Egnlish Words - Hard

273. Integer to English Words -- Hard

· LeetCode· Hard· Python
1m

LeetCode 272 Closest Binary Search Tree Value II - Hard

272. Closest Binary Search Tree Value II

· LeetCode· Hard· Python
1m

LeetCode 270 Closest Binary Search Tree Value - Easy

270. Closest Binary Search Tree Value

· LeetCode· Easy· Python
2m

LeetCode 27 Remove Element - Easy

27. Remove Element

· LeetCode· Easy· Python
2m

LeetCode 269 Alien Dictionary - Hard

269. Alien Dictionary

· LeetCode· Hard· Python
1m

LeetCode 268 Missing Number - Easy

268. Missing Number

· LeetCode· Easy· Python
2m

LeetCode 265 Paint House II - Hard

There are a row of n houses, each house can be painted with one of the k colors. The cost of painting each house with a certain color is …

· LeetCode· Hard· Python
1m

LeetCode 264 Ugly Number II - Medium

264. Ugly Number II

· LeetCode· Medium· Python
1m

LeetCode 26 Remove Duplicatesfrom Sorted Array - Easy

26. Remove Duplicates from Sorted Array

· LeetCode· Easy· Python
1m

LeetCode 258 Add Digits - Easy

258. Add Digits -- Easy

· LeetCode· Easy· Python
1m

LeetCode 257 B Inary Tree Paths - Easy

257. Binary Tree Paths

· LeetCode· Easy· Python
1m

LeetCode 256 Paint House - Easy

There are a row of n houses, each house can be painted with one of the three colors: red, blue or green. The cost of painting each house …

· LeetCode· Easy· Python
1m

LeetCode 255 Verify Preorder Sequence In Binary Search Tree - Medium

255. Verify Preorder Sequence in Binary Search Tree -- Medium

· LeetCode· Medium· Python
1m

LeetCode 253 Meeting Rooms II - Medium

253. Meeting Rooms II -- Medium

· LeetCode· Medium· Python
1m

LeetCode 252 Meeting Rooms - Easy

252. Meeting Rooms -- Easy

· LeetCode· Easy· Python
2m

LeetCode 25 Reverse Nodes In K-Group - Hard

25. Reverse Nodes in k-Group -- Hard

· LeetCode· Hard· Python
1m

LeetCode 242 Valid Anagram - Easy

242. Valid Anagram

· LeetCode· Easy· Python
1m

LeetCode 240 Search A2 D Matrix II - Medium

240. Search a 2D Matrix II

· LeetCode· Medium· Python
1m

LeetCode 24 Swap Nodes In Pairs - Medium

24. Swap Nodes in Pairss

· LeetCode· Medium· Python
1m

LeetCode 239 Sliding Window Maximum - Hard

239. Sliding Window Maximum

· LeetCode· Hard· Python
1m

LeetCode 238 Product Of Array Except Self - Medium

238. Product of Array Except Self -- Medium

· LeetCode· Medium· Python
2m

LeetCode 236 Lowest Common Ancestor Of A Binary Tree - Medium

236. Lowest Common Ancestor of a Binary Tree

· LeetCode· Medium· Python
1m

LeetCode 235 Lowest Common Ancestor Of A Binary Search Tree - Easy

235. Lowest Common Ancestor of a Binary Search Tree -- Easy

· LeetCode· Easy· Python
1m

LeetCode 234 Palindrome Linked List - Easy

234. Palindrome Linked List

· LeetCode· Easy· Python
2m

LeetCode 232 Implement Queue Using Stacks - Easy

232. Implement Queue using Stacks

· LeetCode· Easy· Python
1m

LeetCode 230 Kth Smallest Element Ina BST - Medium

230. Kth Smallest Element in a BST

· LeetCode· Medium· Python
2m

LeetCode 23 Merge K Sorted Lists - Hard

23. Merge k Sorted Lists

· LeetCode· Hard· Python
1m

LeetCode 229 Majority Element II - Medium

229. Majority Element II

· LeetCode· Medium· Python
1m

LeetCode 227 Basic Calculator II - Medium

227. Basic Calculator II -- Medium

· LeetCode· Medium· Python
1m

LeetCode 226 Invert Binary Tree - Easy

· LeetCode· Easy· Python
1m

LeetCode 225 Implement Stack Using Queues - Easy

225. Implement Stack using Queues

· LeetCode· Easy· Python
2m

LeetCode 222 Count Complete Tree Nodes - Medium

222. Count Complete Tree Nodes -- Medium

· LeetCode· Medium· Python
1m

LeetCode 221 Maximal Square - Medium

Given a 2D binary matrix filled with 0's and 1's, find the largest square containing only 1's and return its area.

· LeetCode· Medium· Python
2m

LeetCode 220 Contains Duplicate III - Medium

220. Contains Duplicate III -- Medium

· LeetCode· Medium· Python
1m

LeetCode 22 Generate Parentheses - Medium

22. Generate Parentheses

· LeetCode· Medium· Python
1m

LeetCode 219 Contains Duplicate II - Easy

219. Contains Duplicate II -- Easy

· LeetCode· Easy· Python
1m

LeetCode 217 Contains Duplicate - Easy

217. Contains Duplicate -- Easy

· LeetCode· Easy· Python
2m

LeetCode 215 Kth Largest Element In An Array - Medium

Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct elem…

· LeetCode· Medium· Python
1m

LeetCode 214 Shortest Palindrome - Hard

214. Shortest Palindrome

· LeetCode· Hard· Python
1m

LeetCode 212 Wird Search II - Hard

212. Word Search II

· LeetCode· Hard· Python
2m

LeetCode 210 Course Schedule II - Medium

210. Course Schedule II

· LeetCode· Medium· Python
1m

LeetCode 21 Merge Two Sorted Lists - Easy

21. Merge Two Sorted Lists

· LeetCode· Easy· Python
1m

LeetCode 209 Minimum Size Subarray Sum - Medium

209. Minimum Size Subarray Sum

· LeetCode· Medium· Python
1m

LeetCode 207 Course Schedule - Medium

207. Course Schedule

· LeetCode· Medium· Python
1m

LeetCode 206 Reverse Linked List - Easy

Reverse a singly linked list.

· LeetCode· Easy· Python
1m

LeetCode 204 Count Primes - Easy

Count the number of prime numbers less than a non-negative number, n.

· LeetCode· Easy· Python
1m

LeetCode 203 Remove Linked List Elements - Easy

203. Remove Linked List Elements

· LeetCode· Easy· Python
1m

LeetCode 200 Number Of Islands - Medium

200. Number of Islands

· LeetCode· Medium· Python
1m

LeetCode 20 Valid Parentheses - Easy

20. Valid Parentheses

· LeetCode· Easy· Python
2m

LeetCode 198 House Robber - Easy

198. House Robber -- Easy

· LeetCode· Easy· Python
1m

LeetCode 19 Remove Nth Node From End Of List - Medium

19. Remove Nth Node From End of List

· LeetCode· Medium· Python
1m

LeetCode 189 Rotate Array - Medium

189. Rotate Array -- Medium

· LeetCode· Medium· Python
3m

LeetCode 188 Best Time To Buy And Sell Stock IV - Hard

Say you have an array for which the i-th element is the price of a given stock on day i.

· LeetCode· Hard· Python
2m

LeetCode 18 4 Sum - Medium

18. 4Sum

· LeetCode· Medium· Python
1m

LeetCode 179 Largest Number - Medium

179. Largest Number -- Medium

· LeetCode· Medium· Python
2m

LeetCode 173 Binary Search Tree Iterator - Medium

173. Binary Search Tree Iterator

· LeetCode· Medium· Python
2m

LeetCode 170 Two Sum III-Data Structure Design - Easy

170. Two Sum III - Data structure design

· LeetCode· Easy· Python
1m

LeetCode 17 Letter Combinations Of A Phone Number - Medium

17. Letter Combinations of a Phone Number

· LeetCode· Medium· Python
1m

LeetCode 169 Majority Element - Easy

169. Majority Element

· LeetCode· Easy· Python
1m

LeetCode 167 Two Sum II-Input Array Is Sorted - Easy

Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number.

· LeetCode· Easy· Python
1m

LeetCode 166 Fraction To Recurring Decimal - Medium

166. Fraction to Recurring Decimal -- Medium

· LeetCode· Medium· Python
1m

LeetCode 162 Find Peak Element - Medium

162. Find Peak Element

· LeetCode· Medium· Python
2m

LeetCode 1603 Design Parking System - Easy

1603. Design Parking System -- Easy

· LeetCode· Easy· Python
3m

LeetCode 160 Intersection Of Two Linked Lists - Easy

160. Intersection of Two Linked Lists

· LeetCode· Easy· Python
1m

LeetCode 16 3 Sum Closest - Medium

16. 3Sum Closest

· LeetCode· Medium· Python
2m

LeetCode 1583 Count Unhappy Friends - Medium

1583. Count Unhappy Friends -- Medium

· LeetCode· Medium· Python
1m

LeetCode 155 Min Stack - Easy

155. Min Stack

· LeetCode· Easy· Python
1m

LeetCode 1528 Shuffle String - Easy

1528. Shuffle String -- Easy

· LeetCode· Easy· Python
1m

LeetCode 1522 Diameter Of N-Ary Tree - Medium

1522. Diameter of N-Ary Tree -- Medium

· LeetCode· Medium· Python
1m

LeetCode 152 Maximum Product Subarry - Medium

Given an integer array nums, find the contiguous subarray within an array (containing at least one number) which has the largest product.

· LeetCode· Medium· Python
2m

LeetCode 151 Reverse Words In A String - Medium

151. Reverse Words in a String

· LeetCode· Medium· Python
2m

LeetCode 15 3 Sum - Medium

15. 3Sum

· LeetCode· Medium· Python
1m

LeetCode 1481 Least Number Of Unique Integers After K Removals - Medium

1481. Least Number of Unique Integers after K Removals -- Medium

· LeetCode· Medium· Python
1m

LeetCode 1480 Running Sum Of1 D Array - Easy

1480. Running Sum of 1d Array -- Easy

· LeetCode· Easy· Python
2m

LeetCode 1472 Design Browser History - Medium

1472. Design Browser History -- Medium

· LeetCode· Medium· Python
1m

LeetCode 1470 Shuffle The Array - Easy

1470. Shuffle the Array -- Easy

· LeetCode· Easy· Python
2m

LeetCode 1465 Maximum Area Of A Piece Of Cake After Horizontal And Vertical Cuts - Medium

1465. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts -- Medium

· LeetCode· Medium· Python
2m

LeetCode 146 LRU Cache - Medium

146. LRU Cache

· LeetCode· Medium· Python
1m

LeetCode 1458 Max Dot Product Of Two Subsequences - Hard

1458. Max Dot Product of Two Subsequences

· LeetCode· Hard· Python
2m

LeetCode 1457 Pseudo-Palindromic Paths In A Binary Tree - Medium

1457. Pseudo-Palindromic Paths in a Binary Tree

· LeetCode· Medium· Python
1m

LeetCode 1456 Maximum Number Of Vowels In A Substring Of Given Length - Medium

1456. Maximum Number of Vowels in a Substring of Given Length

· LeetCode· Medium· Python
1m

LeetCode 1455 Check If A Word Occurs As A Prefix Of Any Word In A Sentence - Easy

1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence

· LeetCode· Easy· Python
1m

LeetCode 145 Binary Tree Postorder Traversal - Hard

145. Binary Tree Postorder Traversal

· LeetCode· Hard· Python
1m

LeetCode 144 Binary Tree Preorder Traversal - Medium

144. Binary Tree Preorder Traversal

· LeetCode· Medium· Python
2m

LeetCode 1431 Kids With The Greatest Number Of Candies - Easy

1431. Kids With the Greatest Number of Candies -- Easy

· LeetCode· Easy· Python
1m

LeetCode 143 Reorder List - Medium

143. Reorder List -- Medium

· LeetCode· Medium· Python
2m

LeetCode 1429 First Unique Number - Medium

1429. First Unique Number -- Medium

· LeetCode· Medium· Python
2m

LeetCode 1423 Maximum Points You Can Obtain From Cards - Medium

1423. Maximum Points You Can Obtain from Cards -- Medium

· LeetCode· Medium· Python
1m

LeetCode 142 Linked List Cycle II - Medium

142. Linked List Cycle II

· LeetCode· Medium· Python
1m

LeetCode 141 Linked List Cycle - Easy

141. Linked List Cycle

· LeetCode· Easy· Python
1m

LeetCode 140 Word Break II - Hard

140. Word Break II -- Hard

· LeetCode· Hard· Python
1m

LeetCode 14 Longest Common Prefix - Easy

14. Longest Common Prefix

· LeetCode· Easy· Python
3m

LeetCode 1396 Design Underground System - Medium

1396. Design Underground System -- Medium

· LeetCode· Medium· Python
1m

LeetCode 138 Copy List With Random Pointer - Medium

138. Copy List with Random Pointer -- Medium

· LeetCode· Medium· Python
3m

LeetCode 1376 Time Needed To Inform All Employees - Medium

1376. Time Needed to Inform All Employees -- Medium

· LeetCode· Medium· Python
1m

LeetCode 1375 Bulb Switcher III - Medium

1375. Bulb Switcher III -- Medium

· LeetCode· Medium· Python
1m

LeetCode 1374 Generate A String With Characters That Have Odd Counts - Easy

1374. Generate a String With Characters That Have Odd Counts -- Easy

· LeetCode· Easy· Python
2m

LeetCode 1366 Rank Teams By Votes - Medium

1366. Rank Teams by Votes -- Medium

· LeetCode· Medium· Python
1m

LeetCode 1365 How Many Numbers Are Smaller Than The Current Number - Easy

1365. How Many Numbers Are Smaller Than the Current Number -- Easy

· LeetCode· Easy· Python
2m

LeetCode 1361 Valid Binary Tree Nodes - Medium

1361. Validate Binary Tree Nodes (Pony.ai CHINA VO)

· LeetCode· Medium· Python
1m

LeetCode 136 Single Number - Easy

136. Single Number -- Easy

· LeetCode· Easy· Python
1m

LeetCode 1352 Product Of The Last K Numbers - Medium

1352. Product of the Last K Numbers -- Medium

· LeetCode· Medium· Python
1m

LeetCode 1347 Minimum Number Of Steps To Make Two Strings Anagram - Medium

1347. Minimum Number of Steps to Make Two Strings Anagram -- Medium

· LeetCode· Medium· Python
1m

LeetCode 134 Gas Station - Medium

· LeetCode· Medium· Python
2m

LeetCode 1339 Maximum Product Of Splitted Binary Tree - Medium

1339. Maximum Product of Splitted Binary Tree -- Medium

· LeetCode· Medium· Python
3m

LeetCode 1334 Find The City With The Smallest Number Of Neighbors At A Threshold Distance - Medium

1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance -- Medium

· LeetCode· Medium· Python
3m

LeetCode 133 Clone Graph - Medium

133. Clone Graph

· LeetCode· Medium· Python
1m

LeetCode 132 Palindrome Partitioning II - Hard

Given a string s, partition s such that every substring of the partition is a palindrome.

· LeetCode· Hard· Python
2m

LeetCode 130 Surrounded Regions - Medium

130. Surrounded Regions -- Medium

· LeetCode· Medium· Python
2m

LeetCode 13 Roman To Integer - Easy

Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.

· LeetCode· Easy· Python
1m

LeetCode 1295 Find Numbers With Even Number Of Digits - Easy

Given an array nums of integers, return how many of them contain an even number of digits.

· LeetCode· Easy· Python
1m

LeetCode 1290 Convert Binary Number In A Linked List To Integer - Easy

Binary to Decimal from Linked List:

· LeetCode· Easy· Python
1m

LeetCode 1289 Minimum Falling Path Sum II - Hard

1289. Minimum Falling Path Sum II -- Hard

· LeetCode· Hard· Python
1m

LeetCode 128 Longest Consecutive Sequence - Hard

128. Longest Consecutive Sequence -- Hard

· LeetCode· Hard· Python
2m

LeetCode 1274 Number Of Ships In A Rectangle - Hard

1274. Number of Ships in a Rectangle -- Hard

· LeetCode· Hard· Python
3m

LeetCode 127 Word Ladder - Medium

127. Word Ladder

· LeetCode· Medium· Python
1m

LeetCode 1266 Minimum Time Visiting All Points - Easy

1266. Minimum Time Visiting All Points -- Easy

· LeetCode· Easy· Python
1m

LeetCode 1262 Greatest Sum Divisible By Three - Medium

1262. Greatest Sum Divisible by Three -- Medium

· LeetCode· Medium· Python
2m

LeetCode 126 Word Ladder II - Hard

126. Word Ladder II

· LeetCode· Hard· Python
1m

LeetCode 1254 Number Of Closed Islands - Medium

1254. Number of Closed Islands -- Medium

· LeetCode· Medium· Python
2m

LeetCode 125 Valid Palindrome - Easy

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.

· LeetCode· Easy· Python
1m

LeetCode 1249 Minimum Remove To Make Valid Parentheses - Medium

1249. Minimum Remove to Make Valid Parentheses -- Medium

· LeetCode· Medium· Python
2m

LeetCode 1244 Design A Leaderboard - Medium

1244. Design A Leaderboard -- Medium

· LeetCode· Medium· Python
1m

LeetCode 124 Binary Tree Maximum Path Sum - Hard

124. Binary Tree Maximum Path Sum -- Hard

· LeetCode· Hard· Python
2m

LeetCode 1235 Maximum Profit In Job Scheduling - Hard

1235. Maximum Profit in Job Scheduling -- Hard

· LeetCode· Hard· Python
2m

LeetCode 123 Best Time To Buy And Sell Stock III - Hard

Say you have an array for which the ith element is the price of a given stock on day i.

· LeetCode· Hard· Python
1m

LeetCode 122 Best Time To Buy And Sell Stock II - Easy

Say you have an array prices for which the ith element is the price of a given stock on day i.

· LeetCode· Easy· Python
2m

LeetCode 1216 Valid Palindrome III - Hard

1216. Valid Palindrome III

· LeetCode· Hard· Python
2m

LeetCode 1214 Two Sum BS Ts - Medium

1214. Two Sum BSTs -- Medium

· LeetCode· Medium· Python
1m

LeetCode 121 Best Time To Buy And Sell Stock - Easy

Say you have an array for which the ith element is the price of a given stock on day i.

· LeetCode· Easy· Python
1m

LeetCode 1209 Remove All Adjacent Duplicates In String - Medium

1209. Remove All Adjacent Duplicates in String II -- Medium

· LeetCode· Medium· Python
2m

LeetCode 1202 Smallest String With Swaps - Medium

1202. Smallest String With Swaps -- Medium

· LeetCode· Medium· Python
1m

LeetCode 1200 Minimum Absolute Difference - Easy

1200. Minimum Absolute Difference -- Easy

· LeetCode· Easy· Python
2m

LeetCode 12 Integer To Roman - Medium

12. Integer to Roman

· LeetCode· Medium· Python
1m

LeetCode 1197 Minimum Knight Moves - Medium

1197. Minimum Knight Moves

· LeetCode· Medium· Python
3m

LeetCode 1188 Design Bounded Blocking Queue - Medium

1188. Design Bounded Blocking Queue -- Medium

· LeetCode· Medium· Python
4m

LeetCode 1172 Dinner Plate Stacks - Hard

1172. Dinner Plate Stacks -- Hard

· LeetCode· Hard· Python
4m

LeetCode 117 Populating Next Right Pointers In Each Node II - Medium

117. Populating Next Right Pointers in Each Node II -- Medium

· LeetCode· Medium· Python
1m

LeetCode 1169 Invalid Transactions - Medium

1169. Invalid Transactions -- Medium

· LeetCode· Medium· Python
2m

LeetCode 1156 Swap For Longest Repeated Character Substring - Medium

1156. Swap For Longest Repeated Character Substring -- Medium

· LeetCode· Medium· Python
1m

LeetCode 1153 String Transforms Into Another String - Hard

1153. String Transforms Into Another String -- Hard

· LeetCode· Hard· Python
2m

LeetCode 115 Distinct Subsequnces - Hard

Given a string S and a string T, count the number of distinct subsequences of S which equals T.

· LeetCode· Hard· Python
2m

LeetCode 1143 Longest Common Subsequence - Medium

Given two strings text1 and text2, return the length of their longest common subsequence.

· LeetCode· Medium· Python
1m

LeetCode 114 Flatten Binary Tree To Linked List - Medium

114. Flatten Binary Tree to Linked List

· LeetCode· Medium· Python
1m

LeetCode 1130 Minimum Cost Tree From Leaf Values - Medium

1130. Minimum Cost Tree From Leaf Values

· LeetCode· Medium· Python
2m

LeetCode 112 Path Sum - Easy

112. Path Sum -- Easy

· LeetCode· Easy· Python
1m

LeetCode 111 Minimum Depth Of Binary Tree - Easy

111. Minimum Depth of Binary Tree -- Easy

· LeetCode· Easy· Python
1m

LeetCode 110 Balanced Binary Tree - Easy

110. Balanced Binary Tree

· LeetCode· Easy· Python
1m

LeetCode 1099 Two Sum Less Than K - Easy

Given an array A of integers and integer K, return the maximum S such that there exists i < j with A[i] + A[j] = S and S < K. If no i, j …

· LeetCode· Easy· Python
2m

LeetCode 1095 Find In Mountain Array - Hard

1095. Find in Mountain Array -- Hard

· LeetCode· Hard· Python
1m

LeetCode 1092 Two City Scheduling - Medium

1029. Two City Scheduling -- Medium

· LeetCode· Medium· Python
1m

LeetCode 1089 Duplicate Zeros - Easy

Given a fixed length array arr of integers, duplicate each occurrence of zero, shifting the remaining elements to the right.

· LeetCode· Easy· Python
1m

LeetCode 1081 Smallest Subsequence Of Distinct Characters - Medium

1081. Smallest Subsequence of Distinct Characters -- Medium

· LeetCode· Medium· Python
4m

LeetCode 1057 Campus Bikes - Medium

1057. Campus Bikes -- Medium

· LeetCode· Medium· Python
1m

LeetCode 1054 Distant Barcodes - Medium

1054. Distant Barcodes -- Medium

· LeetCode· Medium· Python
1m

LeetCode 1052 Grumpy Bookstore Owner - Medium

1052. Grumpy Bookstore Owner

· LeetCode· Medium· Python
1m

LeetCode 1051 Height Checker - Easy

1051. Height Checker -- Easy

· LeetCode· Easy· Python
1m

LeetCode 1049 Last Stone Weight II - Medium

1049. Last Stone Weight II -- Medium

· LeetCode· Medium· Python
1m

LeetCode 104 Maximum Depth Of Binary Tree - Easy

104. Maximum Depth of Binary Tree

· LeetCode· Easy· Python
2m

LeetCode 1031 Maximum Sum Of Two Non-Overlapping Subarrays - Medium

· LeetCode· Medium· Python
1m

LeetCode 103 Binary Tree Zigzag Level Order Traversal - Medium

103. Binary Tree Zigzag Level Order Traversal

· LeetCode· Medium· Python
2m

LeetCode 102 Binary Tree Level Order Traversal - Medium

102. Binary Tree Level Order Traversal

· LeetCode· Medium· Python
1m

LeetCode 101 Symmetric Tree - Easy

101. Symmetric Tree -- Easy

· LeetCode· Easy· Python
1m

LeetCode 1008 Construct Binary Search Tree From Preorder Traversal - Medium

1008. Construct Binary Search Tree from Preorder Traversal -- Medium

· LeetCode· Medium· Python
1m

LeetCode 100 Same Tree - Easy

100. Same Tree -- Easy

· LeetCode· Easy· Python
4m

LeetCode 10 Regular Expression Matching - Hard

Given an input string (s) and a pattern (p), implement regular expression matching with support for '.' and '*'.

· LeetCode· Hard· Python
7m

CyberLeet, a Three.js + React, cyberpunk style visualization for leetcode problems -- made for fun

Built with the native three.js and the create-react-app framework. Data was built with a python crawler.

· three.js· Javascript· Python· HTML & CSS
5m

Rabin-Karp Algorithm - A rolling hash method to locate substring

A very useful concept for string-searhing problem.

· Python
6m

Discrete Events Simulation project for Tech Square Intersection Traffic with real world map visualization playback

A DES traffic simulation software package in python3, a visual playback web app in react.js using deck.gl trips layer

· deck.gl· Javascript· React· Python
4m

Use poisson distribution to generate random discrete events over a time for simulation

An example of how I use poisson distributed random variables to generate discrete events

· Python· Modeling & Simulation
1m

COVID-19 Outbreaks Simulation and Analysis by an Extended SEIR Model focus on the hidden asymptomatic infections

Modeling COVID-19 with three outbreak-spread simulation methodologies - by continuum dynamical system (SIER system by differential equations), by a SEIR cellular automata model, by a Markov Chain Analysis Based on One Dimensional CA model.

· Python· Data Analytics & Visualization· Modeling & Simulation
2m

Hood---Mate V1, a Geo-based Recommendation Sys with SNS feature

Geo-based SNS, Residense/roommates/landlords Recommendation System, Multi-dimensional exploratory data visualization

· deck.gl· Javascript· Python· HTML & CSS