foo.cc: In function 'int main()':
foo.cc:24:9: warning: unused variable 'k' [-Wunused-variable]
   24 |     int k,kk;
      |         ^
foo.cc:24:11: warning: unused variable 'kk' [-Wunused-variable]
   24 |     int k,kk;
      |           ^~

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