Submission #1122073

#	Time	Username	Problem	Language	Result	Execution time	Memory
1122073		vjudge1	Boarding Passes (BOI22_passes)	C++17	5 / 100	1 ms	592 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 dd long double
using namespace std;

const int N = 2e5+123;
const ll mod = 1e9+7;

dd ans=0;

void solve() {

    string s;
    cin >> s;
    ll n=sz(s);
    ll fr=n/2;
    ll sc=n-(n/2);
    ans+=(dd)(fr*(fr-1))/2;
    ans+=(dd)(sc*(sc-1))/2;
    cout << fixed << setprecision(6);
    cout << (dd)ans/2;
}
/*
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: 5 / 5
• Subtask 2: 0 / 25
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40