Submission #1337806

#	Time	Username	Problem	Language	Result	Execution time	Memory
1337806		cansu_mutlu	Sopsug (EGOI23_sopsug)	C++20	0 / 100	5091 ms	24756 KiB

Main

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

int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n,m,k;
    cin >> n >> m >> k;
    vector<array<int,2>> ans;
    int yes = 1;
    vector<int> in(n,0);
    vector<int> a[n];
    while(m--)
    {
        int u,v;
        cin >> u >> v;
        ans.push_back({u,v});
        in[v]++;
        if(in[v]>=2) yes = 0;
        a[u].push_back(v);
    }
    queue<int> q;
    vector<int> cur;
    vector<int> vis(n,0);
    for(int i=0;i<n;i++)
    {
        if(in[i]==0)
        {
             q.push(i);
             vis[i] = 1;
        }
    }
    
    while(q.size())
    {
        int s = q.front();
        q.pop();
        int ok = 0;
        for(int x:a[s])
        { 
          //  cout << s << " "<< x << " "<< vis[x] << endl;
            ok = 1;
            if(vis[x]) yes = 0;
            vis[x] = 1;
            q.push(x);
        }
        if(ok==0) cur.push_back(s);
    }
    for(int i=0;i<n;i++)
    {
        if(vis[i]==0) yes = 0;
    }
    for(int i=0;i<cur.size()-1;i++)
    {
        ans.push_back({cur[i],cur[i+1]});
    }
    if(yes==0 || ans.size()!=n-1)
    {
        cout << "NO" << endl;
        return 0;
    }
    for(auto x:ans) cout << x[0] << " "<< x[1] << endl;
}

• Subtask 0: 0 / 0
• Subtask 1: 0 / 12
• Subtask 2: 0 / 10
• Subtask 3: 0 / 19
• Subtask 4: 0 / 13
• Subtask 5: 0 / 17
• Subtask 6: 0 / 11
• Subtask 7: 0 / 18