foo.cc: In function 'int main()':
foo.cc:8:13: error: 'x' cannot be used as a function
    8 |   cin >> x(i);
      |             ^
foo.cc:9:13: error: 'x' cannot be used as a function
    9 |  cout << x(k) << " ";
      |             ^
foo.cc:11:14: error: invalid types 'int[int]' for array subscript
   11 |   cout << x[j] << " ";
      |              ^

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