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 n,m;
int a[1001][1001];
int b[1001][1001];
void flip(int a[1001][1001],int x)
{
for(int i=0;i<n;i++)
{
a[i][x]=a[x][i]=1-a[i][x];
}
}
bool check(int a[1001][1001])
{
for(int i=1;i<n;i++)
{
if(!a[i][0])
{
flip(a,i);
}
}
for(int i=0;i<n;i++)
{
for(int j=i+1;j<n;j++)
{
if(!a[i][j])return 0;
}
}
return 1;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int x,y;
cin >> n >> m;
for(int i=0;i<m;i++)
{
cin >> x >> y;
x--;
y--;
a[x][y]=a[y][x]=1;
b[x][y]=b[y][x]=1;
}
if(check(a))
{
cout << "DA";
return 0;
}
flip(b,0);
if(check(b))
{
cout << "DA";
}
else
{
cout << "NE";
}
return 0;
}
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