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OI-codes/S2OJ/742/742.cpp

68 lines
1.6 KiB
C++

#include <algorithm>
#include <iostream>
#include <limits>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 55 << 1;
int n, w[N], f[N][N], g[N][N], ans;
char op[N];
int main() {
std::ios::sync_with_stdio(false);
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> op[i] >> w[i];
w[n + i] = w[i];
op[n + i] = op[i];
}
for (int i = 1; i <= (n << 1); i++) {
f[i][i] = g[i][i] = w[i];
}
for (int len = 2; len <= n; len++) {
for (int l = 1, r = len; r <= n * 2; l++, r++) {
f[l][r] = std::numeric_limits<int>::min();
g[l][r] = std::numeric_limits<int>::max();
for (int k = l; k < r; k++) {
int maxl = f[l][k], maxr = f[k + 1][r];
int minl = g[l][k], minr = g[k + 1][r];
if (op[k + 1] == 't') {
f[l][r] = std::max(f[l][r], maxl + maxr);
g[l][r] = std::min(g[l][r], minl + minr);
} else {
int x1 = minl * minr,
x2 = minl * maxr,
x3 = maxl * minr,
x4 = maxl * maxr;
f[l][r] = std::max({f[l][r], x1, x2, x3, x4});
g[l][r] = std::min({g[l][r], x1, x2, x3, x4});
}
}
}
}
ans = std::numeric_limits<int>::min();
for (int i = 1; i <= n; i++) {
ans = std::max(ans, f[i][n + i - 1]);
}
cout << ans << endl;
for (int i = 1; i <= n; i++) {
if (ans == f[i][i + n - 1]) {
cout << i << ' ';
}
}
cout << endl;
return 0;
}