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OI-codes/Luogu/P1063/P1063.cpp

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#include <iostream>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 105 << 1;
int n, a[N], f[N][N], ans;
int main() {
std::ios::sync_with_stdio(false);
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i];
a[n + i] = a[i];
}
for (int len = 2; len <= n; len++) {
for (int l = 1, r = len; r <= n << 1; l++, r++) {
for (int k = l; k < r; k++) {
f[l][r] = std::max(f[l][r], f[l][k] + f[k + 1][r] + a[l] * a[k + 1] * a[r + 1]);
}
}
}
for (int i = 1; i <= n; i++) {
ans = std::max(ans, f[i][n + i - 1]);
}
cout << ans << endl;
return 0;
}