/in/foo.cc: In function 'int main()':
/in/foo.cc:40:3: warning: 'flag' may be used uninitialized in this function [-Wmaybe-uninitialized]
   40 |   if(flag)
      |   ^~
/in/foo.cc:31:31: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   31 |    for(int i=max(x-1,0);i<=min(N-1,x+1);i++){
      |                            ~~~^~~~~~~~~