title: Count Index Pairs Equal Elements Array
signature: countIndexPairsEqualElementsArray(arr, n) {
test_code: import 'dart:convert';
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  bool validateSolution(int actual, int expected){
      return actual.toString() == expected.toString();
  }
  
  String driver(arr, n, int expected){
      try
      {
          if (validateSolution(PLACEHOLDER_FN_NAME(arr, n), expected)){
              return "PASSED";
          }
          return "FAILED";
      }catch(exception_object){
          return exception_object.runtimeType.toString();
      }
  }
  
  int main() {
  
      print("TEST-0...${driver(
          [4, 6, 9, 16, 16, 21, 36, 41, 58, 60, 62, 73, 77, 81, 95], 12, 
          1)
      }");
  
      print("TEST-1...${driver(
          [-86, -72, -26, -34, 18, -62, -66], 3, 
          0)
      }");
  
      print("TEST-2...${driver(
          [1], 0, 
          0)
      }");
  
      print("TEST-3...${driver(
          [16], 0, 
          0)
      }");
  
      print("TEST-4...${driver(
          [-88, -80, -72, -68, -64, -26, 4, 14, 16, 22, 30, 32, 60, 74, 82], 11, 
          0)
      }");
  
      print("TEST-5...${driver(
          [0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1], 9, 
          16)
      }");
  
      print("TEST-6...${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)
      }");
  
      print("TEST-7...${driver(
          [68, -40, -46, -20, -64, 90], 5, 
          0)
      }");
  
      print("TEST-8...${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)
      }");
  
      print("TEST-9...${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)
      }");
  
      return 0;
  }
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;
  }