제출 #625278

#제출 시각아이디문제언어결과실행 시간메모리
625278Ooops_sorryBoarding Passes (BOI22_passes)C++14
0 / 100
0 ms212 KiB
#include<bits/stdc++.h>

using namespace std;

mt19937 rnd(51);

#define ll long long
#define pb push_back
#define ld long double

signed main() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
#endif // LOCAL
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    string s;
    cin >> s;
    int n = s.size();
    cout << setprecision(30) << fixed << (ld)n * (n + 1) / 4 << endl;
    return 0;
}
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