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Minimum Path Sum

问题分析:

动态规划,维护一个二维数组,dp[i][j]表示当前位置最小路径之和

编程实现:

class Solution {
public:
    int minPathSum(vector<vector<int> > &grid) {
        int m=grid.size(),n=grid[0].size();
        int dp[m][n];
        dp[0][0]=grid[0][0];
        for(int i=1;i<m;++i)
        dp[i][0]=grid[i][0]+dp[i-1][0];
        for(int i=1;i<n;++i) 
        dp[0][i]=grid[0][i]+dp[0][i-1];
        for(int i=1;i<m;++i) 
        {
            for(int j=1;j<n;++j) 
            {
                dp[i][j]=grid[i][j]+min(dp[i - 1][j],dp[i][j-1]);
            }
        }
        return dp[m-1][n-1];
    }
};