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;
int vis[1005];
int edge[1005][1005];
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n;cin>>n;
    int m;cin>>m;
    for(int i=1;i<=m;i++){
        int a,b;cin>>a>>b;
        edge[a][b]=1;
        edge[b][a]=1;
    }
    int check=1;
    for(int i=1;i<=n;i++){
        if(!vis[i]){
            vis[i]=1;
            vector<int>v;
            for(int j=1;j<=n;j++)if(edge[i][j])v.push_back(j),vis[j]=1;
            for(auto x:v){
                for(int k=1;k<=n;k++){
                    if(k!=x&&k!=i){
                        if(edge[x][k]!=edge[i][k]){
                            check=0;
                            break;
                        }
                    }
                }
                if(!check)break;
            }
        }
        if(!check)break;
    }
    if(check)cout<<"DA";
    else cout<<"NE";
}
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