This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
vector<vector<int> > ng;
int n,k;
int main(){
cin>>n>>k;
ng.resize(n);
for(int i = 0,a,b ; i < n-1 ; i ++){
cin>>a>>b;a--;b--;
ng[a].push_back(b);
ng[b].push_back(a);
}
if(k*k>=n){
cout<<"DA";
return 0;
}else cout<<"NE";
}
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