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leetcode 64 Minimum Path Sum ----- java
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.
还是之前题的延伸，求最小路径。还是可以在之前的版本上延伸。其实都是62题的变种，理解了dp，其实就都不难。
public class Solution { public int minPathSum(int[][] grid) { int m = grid.length; int n = grid[0].length; if( m == 0 || n == 0) return 0; int result = 0; if( m == 1){ for( int i = 0;i<n;i++) result+=grid[0][i]; return result; } if( n == 1){ for( int i = 0;i<m;i++){ result += grid[i][0]; } return result; } int[] dp = new int[n]; dp[0] = grid[0][0]; for( int i = 1 ;i<n;i++){ dp[i] = dp[i-1]+grid[0][i]; } for( int i = 1;i<m;i++){ dp[0] = dp[0]+grid[i][0]; for( int j = 1;j<n;j++){ dp[j] = dp[j]>dp[j-1]?dp[j-1]+grid[i][j]:dp[j]+grid[i][j]; } } return dp[n-1]; }}
leetcode 64 Minimum Path Sum ----- java
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