title: Count Index Pairs Equal Elements Array
signature: function count_index_pairs_equal_elements_array(arr, n)
test_code: using Printf
  
  # SOLUTION CODE
  # ============================================
  PLACEHOLDER_CODE_BODY
  
  # TESTING CODE 
  # ============================================
  function validate_solution(actual, expected)
      return actual == expected
  end
  
  function driver(arr, n, expected)
      try
  
          if validate_solution(PLACEHOLDER_FN_NAME(arr, n), expected)
              return "PASSED";
          end
          return "FAILED";
      catch exception_obj
          return string(Base.typename(typeof(exception_obj)).wrapper);
      end
  end
  
  function main()
      
      result = driver([4, 6, 9, 16, 16, 21, 36, 41, 58, 60, 62, 73, 77, 81, 95], 12, 1);
      @printf("TEST-0...%s\n",result);
      
      result = driver([-86, -72, -26, -34, 18, -62, -66], 3, 0);
      @printf("TEST-1...%s\n",result);
      
      result = driver([1], 0, 0);
      @printf("TEST-2...%s\n",result);
      
      result = driver([16], 0, 0);
      @printf("TEST-3...%s\n",result);
      
      result = driver([-88, -80, -72, -68, -64, -26, 4, 14, 16, 22, 30, 32, 60, 74, 82], 11, 0);
      @printf("TEST-4...%s\n",result);
      
      result = driver([0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1], 9, 16);
      @printf("TEST-5...%s\n",result);
      
      result = driver([3, 9, 10, 12, 17, 23, 27, 29, 42, 44, 59, 61, 71, 76, 78, 82, 84, 84, 89, 90, 93, 93, 97, 97], 15, 0);
      @printf("TEST-6...%s\n",result);
      
      result = driver([68, -40, -46, -20, -64, 90], 5, 0);
      @printf("TEST-7...%s\n",result);
      
      result = driver([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1], 15, 61);
      @printf("TEST-8...%s\n",result);
      
      result = driver([99, 17, 94, 43, 97, 17, 11, 58, 75, 94, 37, 22, 54, 31, 41, 4, 55, 69, 92, 80, 45, 97, 16, 33, 36, 17, 43, 82, 81, 64, 22, 65, 85, 44, 47, 14], 23, 3);
      @printf("TEST-9...%s\n",result);
      
  end
  
  main()
source_py: def count_index_pairs_equal_elements_array(arr, n):
      ans = 0
      for i in range(0, n):
          for j in range((i + 1), n):
              if (arr[i] == arr[j]):
                  ans += 1
      return ans
source_cpp: int count_index_pairs_equal_elements_array(vector<int> arr, int n) {
    int ans = 0;
    for ( int i = 0;
    i < n;
    i ++ ) for ( int j = i + 1;
    j < n;
    j ++ ) if ( arr [ i ] == arr [ j ] ) ans ++;
    return ans;
  }