Submission #850393

#	Time	Username	Problem	Language	Result	Execution time	Memory
850393		Ahmed57	Boarding Passes (BOI22_passes)	C++17	5 / 100	2 ms	628 KiB

passes

#include <bits/stdc++.h>
using namespace std;
int main(){
    string s;cin>>s;
    long long x = s.size();
    if(x<=2){
        cout<<0.0<<endl;return 0;
    }
    else if(x==3){
        cout<<0.5<<endl;
        return 0;
    }
    long double v1 = x/2 , v2 = x-v1;
    long double ans = ((v1*(v1-1)/2)*(v1*(v1-1)/2))/(v1*(v1-1));
    swap(v1,v2);
    ans+= ((v1*(v1-1)/2)*(v1*(v1-1)/2))/(v1*(v1-1));
    cout<<setprecision(3)<<fixed<<ans<<endl;
    return 0;
}

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