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283. 多边形
https://www.acwing.com/problem/content/submission/code_detail/13075079/
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AcWing/283/283.cpp
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67
AcWing/283/283.cpp
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#include <algorithm>
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#include <iostream>
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#include <limits>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 55 << 1;
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int n, w[N], f[N][N], g[N][N], ans;
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char op[N];
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> n;
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for (int i = 1; i <= n; i++) {
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cin >> op[i] >> w[i];
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w[n + i] = w[i];
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op[n + i] = op[i];
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}
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for (int i = 1; i <= (n << 1); i++) {
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f[i][i] = g[i][i] = w[i];
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}
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for (int len = 2; len <= n; len++) {
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for (int l = 1, r = len; r <= n * 2; l++, r++) {
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f[l][r] = std::numeric_limits<int>::min();
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g[l][r] = std::numeric_limits<int>::max();
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for (int k = l; k < r; k++) {
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int maxl = f[l][k], maxr = f[k + 1][r];
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int minl = g[l][k], minr = g[k + 1][r];
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if (op[k + 1] == 't') {
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f[l][r] = std::max(f[l][r], maxl + maxr);
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g[l][r] = std::min(g[l][r], minl + minr);
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} else {
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int x1 = minl * minr,
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x2 = minl * maxr,
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x3 = maxl * minr,
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x4 = maxl * maxr;
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f[l][r] = std::max({f[l][r], x1, x2, x3, x4});
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g[l][r] = std::min({g[l][r], x1, x2, x3, x4});
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}
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}
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}
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}
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ans = std::numeric_limits<int>::min();
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for (int i = 1; i <= n; i++) {
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ans = std::max(ans, f[i][n + i - 1]);
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}
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cout << ans << endl;
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for (int i = 1; i <= n; i++) {
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if (ans == f[i][i + n - 1]) {
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cout << i << ' ';
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}
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}
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cout << endl;
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return 0;
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}
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BIN
AcWing/283/data/5.ans
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AcWing/283/data/5.ans
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AcWing/283/data/5.in
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AcWing/283/data/5.in
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