C++ 代码

#include <cstdio>
#include <iostream>

using namespace std;

const int N = 510;

int f[N][N];
int a[N][N];
int main()
{
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= i; j++)
            cin >> a[i][j];

    // 初始化
    for (int i = 1; i <= n; i++)
        f[n][i] = a[n][i];

    // 状态转移
    for (int i = n-1; i >=1; i--)
        for (int j = i; j >= 1; j--)
            f[i][j] = max(f[i+1][j], f[i+1][j+1]) + a[i][j];

    cout << f[1][1] << endl;

    return 0;
}