Submission #869546

#	Time	Username	Problem	Language	Result	Execution time	Memory
869546		JoksimKaktus	Logičari (COCI21_logicari)	C++17	0 / 110	20 ms	5724 KiB

Main

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

vector <int> adj[100010];

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(0);
    int n;
    cin >> n;
    for(int i = 0;i < n;i++){
        int u,v;
        cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    bool cyc = true;
    for(int i =1;i <= n;i++){
        if(adj[i].size() != 2){
            cyc = false;
            break;
        }
    }
    if(cyc){
        if((n % 4 == 0 || n % 4 == 3) && n > 3){
            cout << n/2;
        }else{
            cout << -1;
        }
    }
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 40
• Subtask 4: 0 / 50