foo.cc: In function ‘int main()’:
foo.cc:15:34: error: unable to find numeric literal operator ‘operator""h’
   15 |                         if(h1[i]>2h[j]&&h2[j]!=0&&visit[j]==1)
      |                                  ^~
foo.cc:15:34: note: use ‘-fext-numeric-literals’ to enable more built-in suffixes