Description Find connected component in undirected graph. Each node in the graph contai...
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431. Connected Component in Undirected Graph -
178. Graph Valid TreeDescription Givennnodes labeled from0ton - 1and a list ofundirectededges (each edge is ...
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python中defaultdict用法详解
zz：https://www.jianshu.com/p/bbd258f99fd3 认识defaultdict： 当我使用普通的字典时，用法一般是dict={},添加元素的只...
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531. Six DegreesDescription Six degrees of separation is the theory that everyone and everything is six...
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598. Zombie in MatrixDescription Given a 2D grid, each cell is either a wall2, a zombie1or people0(the numbe...
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618. Search Graph NodesDescription Given aundirected graph, anodeand atarget, return the nearest node to given...
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624. Remove Substrings
Description Given a stringsand a set ofnsubstrings. You are supposed to remove every in...
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667. Longest Palindromic SubsequenceDescription Given a string s, find the longest palindromic subsequence's length in s. Y...
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65. Median of two Sorted ArraysDescription There are two sorted arraysAandBof sizemandnrespectively. Find themedianof ...
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486. Merge K Sorted Arrays
Description Givenksorted integer arrays, merge them into one sorted array. Example Exam...
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577. Merge K Sorted Interval Lists
Description MergeKsorted interval lists into one sorted interval list. You need to merg...
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654. Sparse Matrix Multiplication
Description Given twoSparse MatrixA and B, return the result of AB. You may assume that...
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944. Maximum SubmatrixDescription Given ann x nmatrix ofpositiveandnegativeintegers, find the submatrix with ...
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64. Merge Sorted Array
Description Given two sorted integer arrays A and B, merge B into A as one sorted array...
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839. Merge Two Sorted Interval Lists
Description Merge two sorted (ascending) lists of interval and return it as a new sorte...
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115. Unique Paths IIDescription Follow up for "Unique Paths": Now consider if some obstacles are added to t...
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114. Unique PathsDescription A robot is located at the top-left corner of amxngrid. The robot can only m...
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603. Largest Divisible Subset
Description Given a set ofdistinct positiveintegers, find the largest subset such that ...
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602. Russian Doll EnvelopesDescription Give a number of envelopes with widths and heights given as a pair of integ...
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76. Longest Increasing SubsequenceDescription Given a sequence of integers, find the longest increasing subsequence (LIS)...