[Lintcode]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.
Example
Note
You can only move either down or right at any point in time.
public class Solution { /** * @param grid: a list of lists of integers. * @return: An integer, minimizes the sum of all numbers along its path */ public int minPathSum(int[][] grid) { // write your code here if(grid.length==0 || grid[0].length==0) return 0; int m=grid.length; int n=grid[0].length; int[][] sum=new int[m][n]; int minSum; for(int i=0;i<m;i++) { for(int j=0;j<n;j++) { if(i==0&&j==0) { minSum=0; } else if(i==0) {minSum=sum[0][j-1];} else if(j==0) {minSum=sum[i-1][0];} else { minSum=Math.min(sum[i-1][j],sum[i][j-1]); } sum[i][j]=minSum+grid[i][j]; } } return sum[m-1][n-1]; } }