foo.cc: In function 'int main()':
foo.cc:12:15: error: 'n' was not declared in this scope
   12 |  SelectSort(a,n);
      |               ^
foo.cc:11:6: warning: unused variable 'k' [-Wunused-variable]
   11 |  int k;
      |      ^
foo.cc: In function 'void SelectSort(int*, int)':
foo.cc:18:17: error: 'k' was not declared in this scope
   18 |  for(int i=0; i<k; i++)
      |                 ^

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