title: Array Range Queries Elements Frequency Value
signature: def arrayRangeQueriesElementsFrequencyValue(start: Int, end_arg1: Int, arr: List[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(start: Int, end_arg1: Int, arr: List[Int], expected: Int): String = {
      try {
          if (validateSolution(PLACEHOLDER_FN_NAME(start, end_arg1, arr),expected)) {
              "PASSED"
          } else{
              "FAILED"
          }
      }catch{
          case e: Exception => {e.getClass.getName}
      }
  
  }
  object QuestionEvaluator extends App {
  
      println(s"TEST-0...${driver(
        0, 31, List(1, 2, 2, 3, 3, 3, 12, 13, 18, 18, 26, 28, 29, 36, 37, 39, 40, 49, 55, 57, 63, 69, 69, 73, 85, 86, 87, 87, 89, 89, 90, 91, 92, 93, 93, 93, 95, 99), 
        3    
      )}")   
  
  
      println(s"TEST-1...${driver(
        1, 25, List(24, -62, 2, 1, 94, 56, -22, -70, -22, -34, -92, -18, 56, 2, 60, 38, -88, 16, -28, 30, -30, 58, -80, 94, 6, 56), 
        2    
      )}")   
  
  
      println(s"TEST-2...${driver(
        3, 4, List(0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1), 
        1    
      )}")   
  
  
      println(s"TEST-3...${driver(
        10, 15, List(84, 13, 81, 40, 87, 82, 50, 30, 90, 80, 81, 70, 14, 54, 72, 93, 78, 27, 61), 
        0    
      )}")   
  
  
      println(s"TEST-4...${driver(
        2, 3, List(-20, 20, 34, 60, 90), 
        0    
      )}")   
  
  
      println(s"TEST-5...${driver(
        0, 6, List(1, 0, 0, 0, 0, 0, 0, 0, 0, 0), 
        1    
      )}")   
  
  
      println(s"TEST-6...${driver(
        14, 18, List(11, 18, 18, 19, 25, 30, 42, 42, 56, 58, 63, 66, 67, 68, 69, 75, 78, 83, 83), 
        0    
      )}")   
  
  
      println(s"TEST-7...${driver(
        29, 33, List(-24, -82, 24, -84, 94, 2, -30, 86, 58, -56, -96, 60, -38, 76, 94, 74, -98, -84, -38, 46, 4, -84, -90, -28, -50, 46, 16, 28, -14, -82, -64, 42, 64, -2, -40, 96, 60, 2, -86, 32, 38, -66), 
        0    
      )}")   
  
  
      println(s"TEST-8...${driver(
        31, 19, List(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1), 
        0    
      )}")   
  
  
      println(s"TEST-9...${driver(
        21, 32, List(2, 91, 42, 85, 97, 92, 24, 39, 63, 89, 31, 59, 51, 89, 72, 62, 26, 92, 75, 4, 6, 13, 20, 95, 22, 30, 52, 60, 37, 27, 49, 15, 67, 26), 
        0    
      )}")   
  
  }
  
source_py: def array_range_queries_elements_frequency_value(start, end, arr):
      frequency = dict()
      for i in range(start, (end + 1)):
          if (arr[i] in frequency.keys()):
              frequency[arr[i]] += 1
          else:
              frequency[arr[i]] = 1
      count = 0
      for x in frequency:
          if (x == frequency[x]):
              count += 1
      return count
source_cpp: int array_range_queries_elements_frequency_value(int start, int end, vector<int> arr) {
    unordered_map < int, int > frequency;
    for ( int i = start;
    i <= end;
    i ++ ) frequency [ arr [ i ] ] ++;
    int count = 0;
    for ( auto x : frequency ) if ( x . first == x . second ) count ++;
    return count;
  }