Submission #1230032

#TimeUsernameProblemLanguageResultExecution timeMemory
1230032irmuunBoarding Passes (BOI22_passes)C++20
0 / 100
0 ms324 KiB
#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(3)<<(L*(L-1)/2+R*(R-1)/2)/2.0; }
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