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- #include <iostream>
- #include <cstring>
- using namespace std;
- int n,m, a[101][101],viz[101];
- void citire()
- {
- cin>>n>>m;
- int x,y;
- for(int i=1;i<=m;i++)
- {
- cin>>x>>y;
- a[x][y]=1;
- }
- }
- void dfs(int x)
- {
- viz[x]=1;
- for(int i=1;i<=n;i++)
- if(a[i][x]==1&&viz[i]==0)
- dfs(i);
- }
- void mall()
- {
- int i,j;
- bool ok=0;
- for(i=1;i<=n;i++)
- {
- memset(viz,0,sizeof(viz));
- dfs(i);
- for(j=1;j<=n;j++)
- if(viz[j]==0)
- break;
- if(j>n)
- {
- ok=1;
- break;
- }
- }
- if(ok==1)
- cout<<i;
- else
- cout<<"NU EXISTA";
- }
- int main()
- {
- citire();
- mall();
- return 0;
- }
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