Submission #704918

#	Time	Username	Problem	Language	Result	Execution time	Memory
704918		guagua0407	Naboj (COCI22_naboj)	C++17	110 / 110	272 ms	21384 KiB

naboj

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define f first
#define s second
#define all(x) x.begin(),x.end()

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n,m;
    cin>>n>>m;
    vector<int> in(n,0);
    vector<bool> visited(n,false);
    vector<int> adj[n],adjr[n];
    for(int i=0;i<m;i++){
        int a,b;
        cin>>a>>b;
        a--;
        b--;
        in[a]++;
        adj[b].push_back(a);
    }
    queue<int> q;
    for(int i=0;i<n;i++){
        if(in[i]==0){
            visited[i]=true;
            q.push(i);
        }
    }
    vector<pair<int,int>> ans;
    while(!q.empty()){
        int v=q.front();
        q.pop();
        ans.push_back({v,0});
        for(auto u:adj[v]){
            if(visited[u]){
                cout<<-1;
                return 0;
            }
            in[u]--;
            if(in[u]==0){
                visited[u]=true;
                q.push(u);
            }
        }
    }
    if(ans.size()!=n){
        cout<<-1;
        return 0;
    }
    cout<<ans.size()<<'\n';
    reverse(all(ans));
    for(auto v:ans){
        cout<<v.f+1<<' '<<v.s<<'\n';
    }
}

Compilation message (stderr)

naboj.cpp: In function 'int main()':
naboj.cpp:48:18: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   48 |     if(ans.size()!=n){
      |        ~~~~~~~~~~^~~

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