Submission #938524

#	Time	Username	Problem	Language	Result	Execution time	Memory
938524		LucaIlie	Boarding Passes (BOI22_passes)	C++17	5 / 100	2 ms	604 KiB

passes

#include <bits/stdc++.h>

using namespace std;

double expectedInversions( int n ) {
    return (double)n * (n - 1) / 4;
}

int main() {
    int n;
    string s;

    cin >> s;
    n = s.size();

    cout << fixed << setprecision( 3 ) << expectedInversions( n / 2 ) + expectedInversions( n - n / 2 );

    return 0;
}

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