제출 #574141

#제출 시각아이디문제언어결과실행 시간메모리
574141eecsBoarding Passes (BOI22_passes)C++17
30 / 100
2061 ms1172 KiB
#include <bits/stdc++.h> using namespace std; string str; long long f[1 << 15]; vector<int> pos[15]; int main() { ios::sync_with_stdio(0), cin.tie(0); cin >> str; int n = *max_element(str.begin(), str.end()) - 'A' + 1; for (int i = 0; i < str.size(); i++) { pos[str[i] - 'A'].push_back(i); } 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 (pos[i].empty()) { 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; }; f[S | (1 << i)] = min(f[S | (1 << i)], f[S] + calc(-1)); int l = 1, r = pos[i].size() - 1, p = 0; while (l <= r) { int mid = (l + r) / 2; calc(pos[i][mid]) < calc(pos[i][mid - 1]) ? l = (p = mid) + 1 : r = mid - 1; } f[S | (1 << i)] = min(f[S | (1 << i)], f[S] + calc(pos[i][p])); } } cout << f[(1 << n) - 1] / 2 << (f[(1 << n) - 1] % 2 ? ".5" : "") << "\n"; return 0; }

컴파일 시 표준 에러 (stderr) 메시지

passes.cpp: In function 'int main()':
passes.cpp:12:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |     for (int i = 0; i < str.size(); i++) {
      |                     ~~^~~~~~~~~~~~
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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