Submission #804510

#	Time	Username	Problem	Language	Result	Execution time	Memory
804510		Tunglam07	Naboj (COCI22_naboj)	C++17	110 / 110	402 ms	23920 KiB

naboj

#include <bits/stdc++.h>
using namespace std;
 
vector<long long> vec[200005], ans;
long long m ,n ,dp[200005];

int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> m >> n;
	queue<long long> q;
	for(int i=1;i<=n;i++)
	{
		long long a ,b;
		cin >> a >> b;
		vec[a].push_back(b);
		dp[b]++;
	} 
	for(int i=1;i<=m;i++)
	{
		if(dp[i]==0) 
		{
			q.push(i);
		}
	}
	while(!q.empty())
  	{
    	long long id = q.front();
    	q.pop();
    	ans.push_back(id);
    	for(long long nx:vec[id])
		{
    		dp[nx]--;
    		if(dp[nx]==0) 
			{
		  		q.push(nx);
			}
    	}
  	}
	if(ans.size()!=m) 
  	{
  		cout << -1;
  	}
  	else 
	{
   		cout << ans.size() <<endl;
    	for(long long nx:ans)
		{
    		cout << nx << " " << 0 << endl;
    	}
  	}
}

Compilation message (stderr)

naboj.cpp: In function 'int main()':
naboj.cpp:42:15: 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]
   42 |  if(ans.size()!=m)
      |     ~~~~~~~~~~^~~

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