foo.cc: In function 'int maxyue(int, int)':
foo.cc:10:13: warning: unused variable 'y' [-Wunused-variable]
   10 |         int y;
      |             ^
foo.cc: In function 'int main()':
foo.cc:39:17: warning: 'yue' may be used uninitialized [-Wmaybe-uninitialized]
   39 |         cout << yue << endl;
      |                 ^~~
foo.cc:32:13: note: 'yue' was declared here
   32 |         int yue;
      |             ^~~

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