foo.cc: In function 'int sort1(int*, int)':
foo.cc:11:13: warning: unused variable 'i' [-Wunused-variable]
   11 |         int i ;
      |             ^
foo.cc: In function 'int sort2(int*, int)':
foo.cc:28:13: warning: unused variable 'i' [-Wunused-variable]
   28 |         int i;
      |             ^

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