Submission #784148

#	Time	Username	Problem	Language	Result	Execution time	Memory
784148		serifefedartar	Logičari (COCI21_logicari)	C++17	10 / 110	27 ms	7304 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define fast ios::sync_with_stdio(0);cin.tie(0);
typedef long long ll;
#define f first
#define s second
#define MAXN 100005

vector<vector<int>> graph;
int main() {
    fast
    int n;
    cin >> n;

    graph = vector<vector<int>>(n+1, vector<int>(0));
    int deg[n+1];
    memset(deg, 0, sizeof(deg));
    for (int i = 0; i < n; i++) {
        int u, v;
        cin >> u >> v;
        graph[u].push_back(v);
        graph[v].push_back(u);
        deg[u]++;
        deg[v]++;
    }

    bool control = true;
    for (int i = 1; i <= n; i++)
        if (deg[i] != 2)
            control = false;

    if (control) {
        if (n % 4 == 0)
            cout << n / 2 << endl;
        else
            cout << -1 << endl;
    }
}

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