原题 思路: 用到dp的思想,到row,col点路径数量 : path[row][col]=path[row][col-1]+path[row-1][col]; 遍历row*col,如果map[row][col]为1,则将其置为0:如果非1,则进行上述公式. 最后返回path[终点row][终点col]的值即为解. 一开始的代码,beat 44%,效率不高 class Solution { public: int uniquePathsWithObstacles(vector<vector<i…

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 any point in time. The robot is trying to reach the bottom-right corner of the grid (marked 'Finish'…

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 point in time. The robot is trying to reach the bottom-right corner of the grid (marked 'Finish' in t…

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 point in time. The robot is trying to reach the bottom-right corner of the grid (marked 'Finish' in t…

Follow up for "Unique Paths": Now consider if some obstacles are added to the grids. How many unique paths would there be? An obstacle and empty space is marked as 1 and 0 respectively in the grid. For example, There is one obstacle in the middl…

1. 原题链接 https://leetcode.com/problems/unique-paths-ii/description/…

62. Unique Paths class Solution { public: int uniquePaths(int m, int n) { || n <= ) ; vector<vector<int> > dp(m,vector<int>(n)); dp[][] = ; ;i < m;i++) dp[i][] = ; ;i < n;i++) dp[][i] = ; ;i < m;i++){ ;j < n;j++){ dp[i][j]…

Unique Paths II Follow up for "Unique Paths": Now consider if some obstacles are added to the grids. How many unique paths would there be? An obstacle and empty space is marked as 1 and 0 respectively in the grid. For example, There is one obsta…

https://leetcode.com/problems/unique-paths/ 这道题,不利用动态规划基本上规模变大会运行超时,下面自己写得这段代码,直接暴力破解,只能应付小规模的情形,当23*12时就超时了: class Solution { public: // Solution():dp1(m,vector<int>(n,-1)),dp2(m,vector<int>(n,-1)){ // } int uniquePaths(int m, int n) { helper…

Unique Paths II 题解 原创文章,拒绝转载 题目来源:https://leetcode.com/problems/unique-paths-ii/description/ Description Follow up for "Unique Paths": Now consider if some obstacles are added to the grids. How many unique paths would there be? An obstacle and e…