/in/foo.cc: In function 'int Unique(int, int*)':
/in/foo.cc:31:7: error: 'i' was not declared in this scope
  for (i=0;i<s;i++) {
       ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:43:6: error: 'i' was not declared in this scope
  for(i=0;i<n2;i++)
      ^