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Leetcode 62 Unique Paths

来源:程序员人生   发布时间:2016-11-21 08:40:59 阅读次数:1348次

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 the diagram below).

How many possible unique paths are there?


Above is a 3 x 7 grid. How many possible unique paths are there?

Note: m and n will be at most 100.

DP基础题,不多说了,左和上方转移

class Solution { public: int uniquePaths(int m, int n) { vector<int> row(n+1,0); vector<vector<int>> dp(m+1,row); dp[0][1]=1; for(int i=1;i<=m;i++) for(int j=1;j<=n;j++) dp[i][j]=dp[i⑴][j]+dp[i][j⑴]; return dp[m][n]; } };


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