Submission #574136

#TimeUsernameProblemLanguageResultExecution timeMemory
574136eecsBoarding Passes (BOI22_passes)C++17
0 / 100
2044 ms468 KiB
#include <bits/stdc++.h> using namespace std; const int n = 15; string str; long long f[1 << n]; int main() { ios::sync_with_stdio(0), cin.tie(0); cin >> str; static bool vis[n]; for (char c : str) vis[c - 'A'] = 1; fill(f + 1, f + (1 << n), 1e18); for (int S = 0; S < 1 << n; S++) { for (int i = 0; i < n; i++) if (!(S >> i & 1)) { if (!vis[i]) { f[S | (1 << i)] = min(f[S | (1 << i)], f[S]); continue; } auto calc = [&](int p) { int c0 = 0, c1 = 0; long long s = 0; for (int j = p; ~j; j--) { if (str[j] - 'A' == i) c0++; else if (S >> (str[j] - 'A') & 1) s += c0; } for (int j = p + 1; j < str.size(); j++) { if (str[j] - 'A' == i) c1++; else if (S >> (str[j] - 'A') & 1) s += c1; } return 2 * s + 1LL * c0 * (c0 - 1) / 2 + 1LL * c1 * (c1 - 1) / 2; }; for (int p = -1; p < (int)str.size(); p++) { f[S | (1 << i)] = min(f[S | (1 << i)], f[S] + calc(p)); } } } cout << f[(1 << n) - 1] / 2 << "." << (f[(1 << n) - 1] % 2 ? 5 : 0) << "\n"; return 0; }

Compilation message (stderr)

passes.cpp: In lambda function:
passes.cpp:26:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |                 for (int j = p + 1; j < str.size(); j++) {
      |                                     ~~^~~~~~~~~~~~
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