제출 #782606

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
782606		christinelynn	Naboj (COCI22_naboj)	C++17	110 / 110	175 ms	21068 KiB

naboj

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define endl "\n"
#define pii pair<ll,ll>
#define pb push_back
#define vi vector<ll>
#define pque priority_queue
#define pqueg priority_queue<ll,vector<ll>,greater<ll>>
#define que queue<ll>
#define FOR(m,i,n) for(int i=(m); i<=(n); i++)
#define FORM(m,i,n) for(int i=(m); i>=(n); i--)
ll n,m,u,v;
bool vis[200200];
vector<ll> adj[200200],ans;
ll top[200200];
queue<ll> q;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cin >> n >> m;
  FOR(1,i,m) {
    cin >> u >> v;
    adj[v].pb(u);
    top[u]++;
  }
  FOR(1,i,n) {
    if(top[i] == 0) {
      q.push(i);
      vis[i] = true;
      ans.pb(i);
    }
  }
  while(!q.empty()) {
    ll x = q.front();
    q.pop();
    for(auto i : adj[x]) {
      if(!vis[i]) {
        top[i]--;
        if(top[i] == 0) {
          vis[i] = true;
          ans.pb(i);
          q.push(i);
        }
      }
    }
  }
  if(ans.size() != n) {
    cout << -1 << endl;
    return 0;
  }
  cout << n << endl;
  for(auto i : ans) {
    cout << i << " 1" << endl;
  }
}

/*
5 5
3 1
2 3
4 2
5 2
5 4
*/

컴파일 시 표준 에러 (stderr) 메시지

naboj.cpp: In function 'int main()':
naboj.cpp:50:17: 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]
   50 |   if(ans.size() != n) {
      |      ~~~~~~~~~~~^~~~

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