Submission #782223

#	Time	Username	Problem	Language	Result	Execution time	Memory
782223		christinelynn	Naboj (COCI22_naboj)	C++17	110 / 110	552 ms	19316 KiB

naboj

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n,m;
vector <ll> al[200005];
ll deg[200005];
int main(){
    cin>>n>>m;
    queue<ll> q;
    for (int i=1;i<=m;i++){
        ll a,b;
        cin>>a>>b;
        al[a].push_back(b);
        deg[b]++;
    }
    vector <pair<ll,ll>> ans;
    for (int i=1;i<=n;i++){
        if (deg[i]==0) {
            q.push(i);
            ans.push_back({i,0});
        }
    }
    while(!q.empty()){
        ll u=q.front(); q.pop();
        for (auto z:al[u]){
            deg[z]--;
            if (deg[z]==0){
                ans.push_back({z,0});
                q.push(z);
            }
        }
    }
    if (ans.size()!=n) cout<<-1;
    
    else{
        cout<<ans.size()<<endl;
        for (auto z:ans){
            cout<<z.first<<" "<<z.second<<endl;
        }
    }
}

Compilation message (stderr)

naboj.cpp: In function 'int main()':
naboj.cpp:33:19: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   33 |     if (ans.size()!=n) cout<<-1;
      |         ~~~~~~~~~~^~~

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