LeetCode 解题思路 46（不同路径、最小路径和）-Java代码：

class Solution {
    public int minPathSum(int[][] grid) {
        for (int i = 0; i < grid.length; i++) {
            for (int j = 0; j < grid[0].length; j++) {
                if (i == 0 && j == 0) continue;
                else if (i == 0) {
                    grid[i][j] += grid[i][j - 1];
                } else if (j == 0) {
                    grid[i][j] += grid[i - 1][j];
                } else {
                    grid[i][j] += Math.min(grid[i - 1][j], grid[i][j - 1]);
                }
            }
        }
        
        return grid[grid.length - 1][grid[0].length - 1];
    }
}