1634C OKEA codeforces solution in cpp
by ujjal roy
#include<bits/stdc++.h>
using namespace std;
int main()
{
int t,n,k,i,e,o,r;
cin>>t;
while(t--)
{
e=2;
o=1;
cin>>n>>k;
r=n*k;
if(k==1)
{
cout<<"YES"<<endl;
for(i=1;i<=n*k;i++) cout<<i<<endl;;
}
else
{
if(n%2!=0) cout<<"NO"<<endl;
else
{
cout<<"YES"<<endl;
while(o<r)
{
for(i=1;i<=k;i++)
{
cout<<o<<" ";
o+=2;
if(o>r) break;
}
cout<<endl;
}
while(e<=r)
{
for(i=1;i<=k;i++)
{
cout<<e<<" ";
e+=2;
if(e>r) break;
}
cout<<endl;
}
}
}
}
return 0;
}
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