foo.c: In function 'main':
foo.c:30:20: warning: unused variable 'size2' [-Wunused-variable]
   30 |         int size1, size2;
      |                    ^~~~~
foo.c:30:13: warning: unused variable 'size1' [-Wunused-variable]
   30 |         int size1, size2;
      |             ^~~~~

[Hydro](https://hydro.ac)提供评测服务