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- #include<iostream>
- #include<fstream>
- using namespace std;
- ifstream fin("conex.in");
- ofstream fout("conex.out");
- int n,a[105][105];
- int x[105], v [105];
- int conex()
- {
- int st,dr;
- st =dr=1;
- v[1]=1;
- x[1]=1;
- while(st<=dr)
- {
- int k=x[st];
- for (int i=1; i<=n; ++i)
- if(v[i]==0 && a[k][i]==1)
- {
- dr++;
- v[i]=1;
- x[dr]=i;
- }
- st++;
- }
- for (int i=1; i<=n; i++)
- if(v[i]==0)
- return 0;
- return 1;
- }
- int main()
- {
- int i,j;
- fin >>n;
- while (fin >> i >> j)
- {
- a[i][j]=a[j][i]=1;
- }
- if (conex())
- fout<<"DA";
- else
- fout<<"NU";
- return 0;
- }
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