/in/foo.cc: In function 'int main()':
/in/foo.cc:60:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(ll x=1;x<=n;x++)
   ^~~
/in/foo.cc:66:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
    if(ok==0) cout<<"NO\n";
    ^~