title: Count Index Pairs Equal Elements Array
signature: def countIndexPairsEqualElementsArray(arr: List[Int], n: Int) = {
test_code: import scala.collection.mutable.HashMap
  import scala.collection.immutable.HashSet
  
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  
  // TESTING CODE 
  // ============================================
  def validateSolution(actual: Int , expected: Int): Boolean = {
      actual.toString == expected.toString
  }
  
  def driver(arr: List[Int], n: Int, expected: Int): String = {
      try {
          if (validateSolution(PLACEHOLDER_FN_NAME(arr, n),expected)) {
              "PASSED"
          } else{
              "FAILED"
          }
      }catch{
          case e: Exception => {e.getClass.getName}
      }
  
  }
  object QuestionEvaluator extends App {
  
      println(s"TEST-0...${driver(
        List(4, 6, 9, 16, 16, 21, 36, 41, 58, 60, 62, 73, 77, 81, 95), 12, 
        1    
      )}")   
  
  
      println(s"TEST-1...${driver(
        List(-86, -72, -26, -34, 18, -62, -66), 3, 
        0    
      )}")   
  
  
      println(s"TEST-2...${driver(
        List(1), 0, 
        0    
      )}")   
  
  
      println(s"TEST-3...${driver(
        List(16), 0, 
        0    
      )}")   
  
  
      println(s"TEST-4...${driver(
        List(-88, -80, -72, -68, -64, -26, 4, 14, 16, 22, 30, 32, 60, 74, 82), 11, 
        0    
      )}")   
  
  
      println(s"TEST-5...${driver(
        List(0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1), 9, 
        16    
      )}")   
  
  
      println(s"TEST-6...${driver(
        List(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    
      )}")   
  
  
      println(s"TEST-7...${driver(
        List(68, -40, -46, -20, -64, 90), 5, 
        0    
      )}")   
  
  
      println(s"TEST-8...${driver(
        List(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    
      )}")   
  
  
      println(s"TEST-9...${driver(
        List(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    
      )}")   
  
  }
  
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;
  }