foo.cc: In function 'int main()':
foo.cc:91:35: warning: unused variable 'b1' [-Wunused-variable]
   91 |                 int a1 = p/10%10, b1 = p % 10;
      |                                   ^~
foo.cc:88:13: warning: unused variable 'cnt' [-Wunused-variable]
   88 |         int cnt = 0;
      |             ^~~

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