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25 lines
622 B
25 lines
622 B
#include <bits/stdc++.h>
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using namespace std;
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const int N = 510;
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const int INF = 0x3f3f3f3f;
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int n;
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int f[N];
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int a[N][N];
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int main() {
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cin >> n;
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for (int i = 1; i <= n; i++)
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for (int j = 1; j <= i; j++)
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cin >> a[i][j];
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// 预求最大，先设最小
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memset(f, -0x3f, sizeof f);
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f[1] = a[1][1]; // 递推的初始化边界
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for (int i = 2; i <= n; i++)
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for (int j = i; j >= 1; j--)
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f[j] = max(f[j - 1], f[j]) + a[i][j];
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int res = -INF;
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for (int i = 1; i <= n; i++) res = max(res, f[i]);
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printf("%d", res);
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return 0;
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} |