/in/foo.cc: In function 'int main()':
/in/foo.cc:31:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for (int i=1; i<=n; i++)
  ^~~
/in/foo.cc:33:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   int l,r,m;
   ^~~
/in/foo.cc: In function 'int check(int)':
/in/foo.cc:25:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:40:18: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d\n",m);
                  ^