剑指 Offer 47. 礼物的最大价值(c++/python)

class Solution {
public:
    int maxValue(vector>& grid) {
        for(int i = 1;i < grid.size();i++){
            grid[i][0] += grid[i-1][0];
        }
        for(int j = 1;j 
class Solution:
    def maxValue(self, grid: List[List[int]]) -> int:
        for i in range(1,len(grid)):
            grid[i][0] += grid[i-1][0]
        for j in range(1,len(grid[0])):
            grid[0][j] += grid[0][j-1]
        for i in range(1,len(grid)):
            for j in range(1,len(grid[0])):
                grid[i][j] += max(grid[i][j-1],grid[i-1][j])
        return grid[-1][-1]