제출 #1230031

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1230031		irmuun	Boarding Passes (BOI22_passes)	C++20	0 / 100	2 ms	580 KiB

passes

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define pb push_back
#define ff first
#define ss second
#define all(s) s.begin(),s.end()
#define rall(s) s.rbegin(),s.rend()

int main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    using ld=long double;
    string s;
    cin>>s;
    sort(all(s));
    assert(s[0]==s.back());
    ll n=s.size();
    ll L=n/2,R=(n+1)/2;
    cout<<setprecision(10)<<(L*(L-1)/2+R*(R-1)/2)/2.0;
}

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