foo.cc: In function 'int main()':
foo.cc:4:17: warning: unused variable 'q' [-Wunused-variable]
    4 |         int a,b,q,w;
      |                 ^
foo.cc:4:19: warning: unused variable 'w' [-Wunused-variable]
    4 |         int a,b,q,w;
      |                   ^

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