제출 #783747

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
783747		christinelynn	Naboj (COCI22_naboj)	C++17	110 / 110	445 ms	18500 KiB

naboj

#include<bits/stdc++.h>
#define ll long long
#define fi first
#define sec second
#define pb push_back
#define pqueue priority_queue
#define int long long
#define pii pair<int,int>
#define supercepat ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(0);
using namespace std;
int tc,ans=0,n,m;
int in1,in2;
vector<int> adj[200005];
bool vis[200005];
int point[200005];
vector<int> topo;
void dfs(int x){
  if(vis[x]) return;
  vis[x]=1;
  topo.pb(x);
  for(auto i : adj[x]){
    point[i]--;
    if(point[i]==0){
      dfs(i);
    }
  }
}
main(){
  supercepat;
  cin>>n>>m;
  for(int i=1;i<=m;i++){
    cin>>in1>>in2;
    adj[in2].pb(in1);
    point[in1]++;
  }
  for(int i=1;i<=n;i++){
    if(point[i]==0&&!vis[i]){
      dfs(i);
    }
  }
  if(topo.size()!=n){
    cout<<-1<<endl;
  }
  else{
    cout<<topo.size()<<endl;
    for(auto i : topo){
      cout<<i<<" "<<1<<endl;
    }
  }
}

컴파일 시 표준 에러 (stderr) 메시지

naboj.cpp:28:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   28 | main(){
      | ^~~~
naboj.cpp: In function 'int main()':
naboj.cpp:41:17: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   41 |   if(topo.size()!=n){
      |      ~~~~~~~~~~~^~~

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