【leetcode】Minimum Path Sum

Minimum Path Sum

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.

Note: You can only move either down or right at any point in time.

 

动态规划即可，与Unique Path类似

 

 class Solution {
 public:
     int minPathSum(vector<vector<int> > &grid) {

         int m=grid.size();
         int n=grid[].size();

        /* int **dp=new int *[m];
         for(int i=0;i<m;i++)
         {
             dp[i]=new int[n];
         }
         */

         vector<vector<int>> dp(m,vector<int>(n));

         dp[][]=grid[][];

         for(int i=;i<m;i++)
         {
             dp[i][]=dp[i-][]+grid[i][];
         }

         for(int j=;j<n;j++)
         {
             dp[][j]=dp[][j-]+grid[][j];
         }

         for(int i=;i<m;i++)
         {
             for(int j=;j<n;j++)
             {
                 dp[i][j]=grid[i][j]+min(dp[i-][j],dp[i][j-]);
             }
         }

         return dp[m-][n-];

     }
 };