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- #include <iostream>
- using namespace std;
- int n,m,gi[50],ge[50],x,y;
- int main()
- {
- int ok=1;
- cin>>n>>m;
- for(int i=1; i<=m; i++)
- {
- cin>>x>>y;
- ge[x]++;
- gi[y]++;
- }
- int maxi = ge[1];
- for(int i=2; i<=n; i++)
- {
- if(ge[i]>maxi)
- maxi = ge[i];
- }
- for(int i=1; i<=n; i++)
- if(ge[i]==0 && gi[i]==0 && ok==1)
- {
- cout <<"DA";
- ok == 0;
- }
- if(ok)
- cout <<"NU";
- cout << endl;
- for(int i=1; i<=n; i++)
- if(ge[i]==maxi)
- cout << i << " ";
- return 0;
- }
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