摘要： You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Follow up:Could you do this in-place? 题目意思很简单，就是给一 阅读全文

摘要： Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1,1,2] have the following unique pe 阅读全文

摘要： Given a collection of distinct numbers, return all possible permutations. For example,[1,2,3] have the following permutations: 给定一个数组，求所有的排列组合。 做出这道题很 阅读全文

摘要： Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array represents your maxim 阅读全文

摘要： Implement wildcard pattern matching with support for '?' and '*'. 全匹配问题，也就是正则式的问题，题目要求两个字符串是否匹配，？代表任意一个字母，＊代表任意个字母，也可以是0个。 第一次写的时候出现了很多问题，我用了递归，但由于＊代表 阅读全文

摘要： Given two numbers represented as strings, return multiplication of the numbers as a string. Note: The numbers can be arbitrarily large and are non-neg 阅读全文

摘要： Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining. 阅读全文

摘要： Given an unsorted integer array, find the first missing positive integer. For example,Given [1,2,0] return 3,and [3,4,-1,1] return 2. Your algorithm s 阅读全文

摘要： Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each num 阅读全文

摘要： Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. The same repeat 阅读全文