title: Array Range Queries Elements Frequency Value
signature: pub fn array_range_queries_elements_frequency_value(start: i32, end_arg1: i32, arr: Vec<i32>) -> i32 {
test_code: use std::collections::HashMap;
  use std::collections::HashSet;
  use std::cmp::*;
  use std::collections::*;
  use std::fmt::*; 
  
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  pub fn validate_solution(actual: i32, expected: i32)->bool{
  return actual==expected
  }
  pub fn driver(start: i32, end_arg1: i32, arr: Vec<i32>, expected: i32)->String{
      if validate_solution(PLACEHOLDER_FN_NAME(start, end_arg1, arr), expected) {
        return "PASSED".to_string();
      };
      return "FAILED".to_string();
  
  }
  
  fn main() {
      println!("TEST-0...{}", driver(
        0, 31, Vec::from([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!("TEST-1...{}", driver(
        1, 25, Vec::from([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!("TEST-2...{}", driver(
        3, 4, Vec::from([0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]), 
        1
      ));
      
      println!("TEST-3...{}", driver(
        10, 15, Vec::from([84, 13, 81, 40, 87, 82, 50, 30, 90, 80, 81, 70, 14, 54, 72, 93, 78, 27, 61]), 
        0
      ));
      
      println!("TEST-4...{}", driver(
        2, 3, Vec::from([-20, 20, 34, 60, 90]), 
        0
      ));
      
      println!("TEST-5...{}", driver(
        0, 6, Vec::from([1, 0, 0, 0, 0, 0, 0, 0, 0, 0]), 
        1
      ));
      
      println!("TEST-6...{}", driver(
        14, 18, Vec::from([11, 18, 18, 19, 25, 30, 42, 42, 56, 58, 63, 66, 67, 68, 69, 75, 78, 83, 83]), 
        0
      ));
      
      println!("TEST-7...{}", driver(
        29, 33, Vec::from([-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!("TEST-8...{}", driver(
        31, 19, Vec::from([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!("TEST-9...{}", driver(
        21, 32, Vec::from([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;
  }