foo.cc: In function 'void merge(int*, int, int, int)':
foo.cc:100:6: error: 'K' was not declared in this scope
  100 |    T[K++]=a[i++];
      |      ^
foo.cc:104:6: error: 'K' was not declared in this scope
  104 |    T[K++]=a[j++];
      |      ^

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