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Longest Valid ParenthesesGiven a string containing just the characters'('and')', find the length of the longest valid (well-formed) parentheses substr... 阅读全文
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Word SearchGiven a 2D board and a word, find if the word exists in the grid.The word can be constructed from letters of sequentially adjacent cell, wh... 阅读全文
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Integer to RomanGiven an integer, convert it to a roman numeral.Input is guaranteed to be within the range from 1 to 3999.罗马数字的组数规则,有几条须注意掌握；(1)基本数字Ⅰ、... 阅读全文
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First Missing PositiveGiven an unsorted integer array, find the first missing positive integer.For example,Given[1,2,0]return3,and[3,4,-1,1]return2.Yo... 阅读全文
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Edit DistanceGiven two wordsword1andword2, find the minimum number of steps required to convertword1toword2. (each operation is counted as 1 step.)You... 阅读全文
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Container With Most WaterGivennnon-negative integersa1,a2, ...,an, where each represents a point at coordinate (i,ai).nvertical lines are drawn such t... 阅读全文
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Reverse Linked List IIReverse a linked list from positionmton. Do it in-place and in one-pass.For example:Given1->2->3->4->5->NULL,m= 2 andn= 4,return... 阅读全文
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Path Sum IIGiven a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum.For example:Given the below binary tr... 阅读全文
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Binary Tree Maximum Path SumGiven a binary tree, find the maximum path sum.The path may start and end at any node in the tree.For example:Given the be... 阅读全文
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Restore IP AddressesGiven a string containing only digits, restore it by returning all possible valid IP address combinations.For example:Given"255255... 阅读全文