摘要： 【题目】 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 move either down or right at 阅读全文

摘要： 【题目】 You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can y 阅读全文

摘要： 【题目】 Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transa 阅读全文

摘要： 【题目】 Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum. Example: 阅读全文

摘要： 【题目】 匹配通配符*，？，DP动态规划，重点是*的两种情况 想象成两个S、P长度的字符串，P匹配S。 S中不会出现通配符。 【条件】 （1）P=null，S=null，TRUE （2）P=null，S!=null，P必然无法匹配S，FALSE。 （3）P[i]=“*” 的TRUE/FALSE状态等 阅读全文

摘要： 【题目】 Given a string, find the length of the longest substring without repeating characters. 【举例】 Example 1: Input: "abcabcbb" Output: 3 Explanation: T 阅读全文

摘要： 【题目】 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 阅读全文

摘要： 【题目】 Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farth 阅读全文