Submission #1121963

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121963		vjudge1	Boarding Passes (BOI22_passes)	C++17	0 / 100	1 ms	336 KiB

passes

#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 int ll
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))/2.0;
    ans+=double(sc*(sc-1))/2.0;
    cout << double(ans / 2.0);
}
/*
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;
}

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