Submission #580054

#	Time	Username	Problem	Language	Result	Execution time	Memory
580054		Josia	Boarding Passes (BOI22_passes)	C++17	5 / 100	3 ms	1680 KiB

passes

#include <bits/stdc++.h>

using namespace std;

#define int int64_t

signed main() {
    cin.tie(0);
    ios_base::sync_with_stdio(0);

    string s; cin >> s;

    int n = s.size();

    cerr << n << "\n";

    vector<vector<int>> groups(26);

    for (int i = 0; i<n; i++) {
        groups[s[i]-'A'].push_back(i);
    }

    // assert(n==groups[s[0]-'A'].size());

    int n1 = (n/2);
    int n2 = ((n+1)/2);

    long double res = (n1-1)*n1 + (n2-1)*n2;

    res /= 4;

    cout << setprecision(30) << res << "\n";

    return 0;
}

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