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Given an undirected graph, return true if and only if it is bipartite. Recall that a gr...

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DFS, BFS 假设点的数目为v, time complexity都为O(v)space complexity, BFS worst case为O(v), 但是DFS为O(...

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Given a 01 matrix M, find the longest line of consecutive one in the matrix. The line c...

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Given two sentences words1, words2 (each represented as an array of strings), and a lis...

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On the first row, we write a 0. Now in every subsequent row, we look at the previous ro...

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You are playing a simplified Pacman game. You start at the point (0, 0), and your desti...

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In a given array nums of positive integers, find three non-overlapping subarrays with m...

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There is a box protected by a password. The password is n digits, where each letter can...

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A move consists of taking a point (x, y) and transforming it to either (x, x+y) or (x+y...

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Minimize Max Distance to Gas Station On a horizontal number line, we have gas stations ...

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Given an array of scores that are non-negative integers. Player 1 picks one of the numb...

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Given an array of integers with possible duplicates, randomly output the index of a giv...

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题目大意：给一个排列，可能有重复元素，我们将数组拆分成一些“块”（分区），并对每个块进行单独排序。连接它们之后，结果等于排序后的数组。问最多能够分成多少个分区（块）分析：因为...

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Given an array consisting of n integers, find the contiguous subarray whose length is g...

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Given strings S and T, find the minimum (contiguous) substring W of S, so that T is a s...

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By now, you are given a secret signature consisting of character 'D' and 'I'. 'D' repre...

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You have 4 cards each containing a number from 1 to 9. You need to judge whether they c...

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Given two non-negative integers num1 and num2 represented as string, return the sum of ...