제출 #1122003

#제출 시각아이디문제언어결과실행 시간메모리
1122003vjudge1Boarding Passes (BOI22_passes)C++17
0 / 100
1 ms336 KiB
#include <bits/stdc++.h> #define ll long long #define all(x) x.begin(), x.end() #define in insert #define F first #define S second #define ppf pop_front #define pb push_back #define ppb pop_back #define pf push_front #define pii pair <int, int> #define pll pair <ll, ll> #define boost() ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0); #define sz(x) (int)x.size() #define double long double using namespace std; const int N = 2e5+123; const ll mod = 1e9+7; void solve() { string s; cin >> s; int n=sz(s); double ans=0; int fr=n/2; int sc=n-(n/2); ans+=(double)(fr*(fr-1))/4.0; ans+=(double)(sc*(sc-1))/4.0; cout << (double)(ans); } /* 4 4 2 2 4 3 1 2 1 3 2 3 3 4 */ signed main() { boost(); int tt=1; //cin >> tt; while (tt--) { solve(); } return 0; }
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