foo.cc: In function 'int maxyue(int, int)':
foo.cc:29:13: warning: unused variable 'y' [-Wunused-variable]
   29 |         int y;
      |             ^
foo.cc: In function 'int main()':
foo.cc:90:30: warning: 'fm' may be used uninitialized [-Wmaybe-uninitialized]
   90 |         cout << fz << " " << fm << endl;
      |                              ^~
foo.cc:81:17: note: 'fm' was declared here
   81 |         int fz, fm;
      |                 ^~
foo.cc:90:23: warning: 'fz' may be used uninitialized [-Wmaybe-uninitialized]
   90 |         cout << fz << " " << fm << endl;
      |                       ^~~
foo.cc:81:13: note: 'fz' was declared here
   81 |         int fz, fm;
      |             ^~

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