/in/foo.c: In function 'main':
/in/foo.c:20:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=0;i<n1+n2-c3;i++)
  ^~~
/in/foo.c:22:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   printf("\n");
   ^~~~~~
/in/foo.c: In function 'f':
/in/foo.c:54:9: warning: 'cnt' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return cnt;
         ^~~
/in/foo.c: In function 'SetUnion':
/in/foo.c:84:10: warning: array subscript is above array bounds [-Warray-bounds]
  return c[20000];
         ~^~~~~~~