for(int i=1;i<=n;i++){ for(int j=1;j<=n/2;j++){ if(i%2!=0){ if(j2<=n-i-1) cout<<"0 0 "; else cout<<"0 1 "; } else{ if(j2<=n-i) cout<<"0 0 "; else cout<<"1 1 "; } } cout<<"\n"; }