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OI-codes/Luogu/P1216/P1216.cpp

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#include <bits/stdc++.h>
using namespace std;
int main() {
int n, a[1005][1005], f[1005][1005];
cin >> n;
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for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i; j++) {
cin >> a[i][j];
}
}
f[1][1] = a[1][1];
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for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i + 1; j++) {
f[i][j] = a[i][j] + max(f[i - 1][j], f[i - 1][j - 1]);
}
}
int ans = -0x3f3f3f;
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for (int i = 1; i <= n; i++) {
ans = max(ans, f[n][i]);
}
cout << ans << endl;
return 0;
}