Submission #782203

#	Time	Username	Problem	Language	Result	Execution time	Memory
782203		andecaandeci	Naboj (COCI22_naboj)	C++17	110 / 110	175 ms	17768 KiB

naboj

#include<bits/stdc++.h>
 
using namespace std;
 
#define fi first
#define se second
#define pii pair<int,int>
#define pll pair<long long, long long>

long long n,m,deg[200005];
vector<long long> vec[200005];
queue<long long> q;

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    long long tc,i,j;
    cin>>n>>m;
    for(i=1;i<=m;i++)
    {
        long long u,v;
        cin>>u>>v;
        deg[v]++;
        vec[u].push_back(v);
    }
    vector<long long> ans;
    for(i=1;i<=n;i++)
    {
        if(deg[i] == 0)
        {
            q.push(i);
            ans.push_back(i);
        }
    }
    
    while(!q.empty())
    {
        long long node = q.front();
        q.pop();
        for(auto it : vec[node])
        {
            deg[it]--;
            if(deg[it] == 0)
            {
                q.push(it);
                ans.push_back(it);
            }
        }
    }
    for(i=1;i<=n;i++)
    {
        if(deg[i] > 0)
        {
            break;
        }
    }
    if(i <= n)
    {
        cout<<-1<<'\n';
    }
    else
    {
        cout<<ans.size()<<'\n';
        for(auto it : ans)
        {
            cout<<it<<" 0\n";
        }
    }
}

Compilation message (stderr)

naboj.cpp: In function 'int main()':
naboj.cpp:17:15: warning: unused variable 'tc' [-Wunused-variable]
   17 |     long long tc,i,j;
      |               ^~
naboj.cpp:17:20: warning: unused variable 'j' [-Wunused-variable]
   17 |     long long tc,i,j;
      |                    ^

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