Q.

#include <bits/stdc++.h>
using namespace std;

int main() {
    int n, m;
    cin >> n >> m;
    vector<vector<int>> c(n + 1, vector<int> (m + 1));
    vector<vector<int>> dp(n + 1, vector<int> (m + 1));
    fori(n){
        forj(m){
            cin >> c[i + 1][j + 1];
        }
    }
    for(int i = 1; i <= n; ++i){
        for(int j = 1; j <= m; ++j){
            dp[i][j] = max(dp[i-1][j], dp[i][j - 1]) + c[i][j];
        }
    }
    cout << dp[n][m];
    return 0;
}