Submission #829415

#	Time	Username	Problem	Language	Result	Execution time	Memory
829415		QwertyPi	Boarding Passes (BOI22_passes)	C++14	5 / 100	2 ms	596 KiB

passes

#include <bits/stdc++.h>
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("Ofast")
#define int long long

using namespace std;

int f(int x){
	return x * (x - 1) / 2;
}

int32_t main(){
	string s; cin >> s;
	int n = s.size();
	int ans = f(n / 2) + f((n + 1) / 2);
	cout << setprecision(10) << fixed << ((long double) ans / 2) << endl;
}

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