摘要：
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 any p 阅读全文
摘要：
Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers along its path. 阅读全文
摘要：
大概题意是这样的 输入一个数字，顺时针生成一个N阶的矩阵 比如:输入数字为： 3 生成矩阵为： 1 2 3 8 9 4 7 6 5 解题思路：我们考虑一圈一圈的生成矩阵，先生成最外面的一圈，然后生成第二圈。。。。 生成矩阵的时候我们要考虑边界的问题，通过矩阵的对角线的两个端点，因为矩阵是一个N x 阅读全文
摘要：
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 you cl 阅读全文