title: Array Range Queries Elements Frequency Value
signature: int arrayRangeQueriesElementsFrequencyValue(int start, int end_arg1, vector<int> arr) {
test_code: #include <algorithm>
  #include <assert.h>
  #include <cstdlib>
  #include <iostream>
  #include <map>
  #include <set>
  #include <string>
  #include <tuple> 
  #include <unordered_map>
  #include <vector>
  #include <math.h>
  #include <cmath>
  #include <bits/stdc++.h>
  #include <numeric>
  #include <functional>
  
  using namespace std;
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  bool validateSolution(int actual, int expected){
      return actual == expected;
  }
  
  string driver(int start, int end_arg1, vector<int> arr, int expected){
      try
      {
          if (validateSolution(PLACEHOLDER_FN_NAME(start, end_arg1, arr), expected)){
              return "PASSED";
          }
          return "FAILED";
      }
      catch (const std::overflow_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::runtime_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::exception& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (...)
      {
          return "UNK_ERROR";
      }
  }
  
  int main() {
      string result = "";
  
      result = driver(0, 31, {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); 
      cout << "TEST-" << 0 << "..."
           <<  result
           << "\n";
  
      result = driver(1, 25, {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); 
      cout << "TEST-" << 1 << "..."
           <<  result
           << "\n";
  
      result = driver(3, 4, {0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 1); 
      cout << "TEST-" << 2 << "..."
           <<  result
           << "\n";
  
      result = driver(10, 15, {84, 13, 81, 40, 87, 82, 50, 30, 90, 80, 81, 70, 14, 54, 72, 93, 78, 27, 61}, 0); 
      cout << "TEST-" << 3 << "..."
           <<  result
           << "\n";
  
      result = driver(2, 3, {-20, 20, 34, 60, 90}, 0); 
      cout << "TEST-" << 4 << "..."
           <<  result
           << "\n";
  
      result = driver(0, 6, {1, 0, 0, 0, 0, 0, 0, 0, 0, 0}, 1); 
      cout << "TEST-" << 5 << "..."
           <<  result
           << "\n";
  
      result = driver(14, 18, {11, 18, 18, 19, 25, 30, 42, 42, 56, 58, 63, 66, 67, 68, 69, 75, 78, 83, 83}, 0); 
      cout << "TEST-" << 6 << "..."
           <<  result
           << "\n";
  
      result = driver(29, 33, {-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); 
      cout << "TEST-" << 7 << "..."
           <<  result
           << "\n";
  
      result = driver(31, 19, {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); 
      cout << "TEST-" << 8 << "..."
           <<  result
           << "\n";
  
      result = driver(21, 32, {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); 
      cout << "TEST-" << 9 << "..."
           <<  result
           << "\n";
  
      return 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;
  }