foo.cc: In function ‘int main()’:
foo.cc:25:17: warning: ‘max’ may be used uninitialized [-Wmaybe-uninitialized]
   25 |                 if(lcm(n,m)>max)
      |                 ^~
foo.cc:20:13: note: ‘max’ was declared here
   20 |         int max;
      |             ^~~