摘要：题目：验证二叉搜索树 难度：Medium 题目内容： Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subt
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摘要：题目：解码方法数 难度：Medium 题目内容： A message containing letters from A-Z is being encoded to numbers using the following mapping: 'A' -> 1 'B' -> 2 ... 'Z' -> 2
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摘要：题目：合并已排序数组 难度：Easy 题目内容： Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. 翻译： 给定两个排序的整数数组nums1和nums2，将nums
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摘要：题目：最大的矩形柱状图 难度：hard 题目内容： Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of lar
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摘要：题目：矩阵单词搜索 难度：Medium 题目内容： Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters of sequentially a
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摘要：题目：矩阵置0 难度：Easy 题目内容： Given a set of distinct integers, nums, return all possible subsets (the power set). Note: The solution set must not contain dup
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摘要：题目：矩阵置0 难度：Easy 题目内容： Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in-place. Given a m x n matrix, if an elemen
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摘要：题目：求平方根 难度：Easy 题目内容： Compute and return the square root of x, where x is guaranteed to be a non-negative integer. Since the return type is an integer
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摘要：题目：数组加一 难度：Easy 题目内容： Given a non-empty array of digits representing a non-negative integer, plus one to the integer. The digits are stored such that
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摘要：题目：唯一路径（机器人走方格） 难度：Medium 题目内容： A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only mo
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摘要：题目：合并区间 难度：Medium 题目内容： Given a collection of intervals, merge all overlapping intervals. Given a collection of intervals, merge all overlapping inter
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摘要：题目：跳跳游戏 难度：Medium 题目内容： Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the arr
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摘要：题目：螺旋矩阵 难度：Medium 题目内容： Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order. 翻译： 给定一个m x n元素的矩阵（m行
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摘要：题目：和最大的子序列 难度：Medium 题目内容： Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and re
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摘要：题目：求x的n次幂 难度：Medium 题目内容： Implement pow(x, n), which calculates x raised to the power n (xn). 翻译： 实现计算x的n次幂。 Example 1: Example 2: Example 3: Note: -1
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摘要：题目：同字符分组 难度：Medium 题目内容： Given an array of strings, group anagrams together. 翻译：给定一组字符串数组，按相同字符组成的字符串分为一组。 Example: 我的思路：因为要分组，那么使用map即可，相同的字符作为键，值为一个
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摘要：题目：求所有全排列 难度：Medium 题目内容： Given a collection of distinct integers, return all possible permutations. 翻译：给定一组各不相同的整数，返回所有可能的排列。 Example: 我的思路：每种情况中，每一个
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摘要：题目：矩阵旋转 难度：Medium 题目内容： You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Note: You have to rotate t
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摘要：题目：通配符匹配 难度：hard 题目内容： Given an input string (s) and a pattern (p), implement wildcard pattern matching with support for '?' and '*'. The matching sho
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摘要：题目：接雨水 难度：hard 题目内容： Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able t
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