Submission #868021

#	Time	Username	Problem	Language	Result	Execution time	Memory
868021		TAhmed33	Boarding Passes (BOI22_passes)	C++98	30 / 100	2070 ms	1344 KiB

passes

#include <bits/stdc++.h>
using namespace std;
typedef long double ld;
typedef long long ll;
string s; int n;
vector <int> pos[26];
int main () {
	cin >> s; n = s.length();
	for (int i = 0; i < n; i++) {
		pos[s[i] - 'A'].push_back(i);
	}
	int x = 0;
	for (int i = 1; i < 26; i++) if (!pos[i].empty()) x = i;
	vector <int> dd;
	ld mn = 1e18;
	for (int i = 0; i <= x; i++) if (!pos[i].empty()) dd.push_back(i);
	do {
		ld sum = 0;
		for (int i = 0; i < (int)dd.size(); i++) {
			int m = pos[dd[i]].size();
			for (int j = 0; j < m; j++) {
				ld cnt = j;
				ld cnt2 = m - j - 1;
				ld cnt3 = 0, cnt4 = 0;
				for (int k = 0; k < i; k++) {
					for (auto l : pos[dd[k]]) {
						if (l < pos[dd[i]][j]) {
							cnt3++;
						} else {
							cnt4++;
						}
					}
				}
				sum += min(cnt * 0.5 + cnt3, cnt2 * 0.5 + cnt4);
			}
		}
		mn = min(mn, sum);
	} while (next_permutation(dd.begin(), dd.end()));
	cout << fixed << setprecision(6) << mn << '\n';
}

• Subtask 1: 5 / 5
• Subtask 2: 25 / 25
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40