Submission #1266600

#	Time	Username	Problem	Language	Result	Execution time	Memory
1266600		canhnam357	Naboj (COCI22_naboj)	C++20	110 / 110	173 ms	14024 KiB

naboj

#include <bits/stdc++.h>
using namespace std;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    vector<vector<int>> adj(n + 1);
    for (int i = 0; i < m; i++) {
        int u, v;
        cin >> u >> v;
        adj[u].push_back(v);
    }   
    vector<int> vis(n + 1), topo;
    function<void(int)> dfs = [&](int u) {
        vis[u] = 1;
        for (int v : adj[u]) {
            if (!vis[v]) dfs(v);
            else if (vis[v] == 1) {
                cout << -1;
                exit(0);
            }
        }
        topo.push_back(u);
        vis[u] = 2;
    };
    for (int i = 1; i <= n; i++) if (!vis[i]) dfs(i);
    cout << n << '\n';
    for (int i : topo) cout << i << ' ' << 1 << '\n';
    return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 25 / 25
• Subtask 3: 70 / 70