foo.cc: In function 'bool pd(cl)':
foo.cc:33:11: warning: unused variable 'j' [-Wunused-variable]
   33 |     int i,j,k;
      |           ^
foo.cc:33:13: warning: unused variable 'k' [-Wunused-variable]
   33 |     int i,j,k;
      |             ^
foo.cc: In function 'int main()':
foo.cc:40:13: warning: unused variable 'k' [-Wunused-variable]
   40 |     int i,j,k;
      |             ^

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