title: Count Number Of Occurrences Or Frequency In A Sorted Array
signature: class Solution {
  
      public int CountNumberOfOccurrencesOrFrequencyInASortedArray(List<int> arr, int n, int x) {
test_code: using System;
  using System.Numerics;
  using System.Diagnostics;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Security.Cryptography;
  using System.Web.UI;
  using System.Web.Script.Serialization;
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  namespace EvaluatePrediction {
      class TestRunner {
          public bool ValidateSolution(int actual, int expected){
              return new JavaScriptSerializer().Serialize(actual) == new JavaScriptSerializer().Serialize(expected);
          }
  
          public string driver(List<int> arr, int n, int x, int expected){
              try{
                PLACEHOLDER_CLS_NAME solution_cls = new PLACEHOLDER_CLS_NAME();
                int pred_result = solution_cls.PLACEHOLDER_FN_NAME(arr, n, x); 
                if (ValidateSolution(
                      pred_result,
                      expected)){
                  return "PASSED";
                }
                return "FAILED";
              } 
              catch (Exception exception_obj)
              {
                return exception_obj.GetType().FullName;
              }
          }
          static void Main(string[] args) {
              TestRunner runner = new TestRunner();
              String result;
              result = runner.driver(
                  new List<int>{16, 18, 24, 27, 34, 36, 41, 43, 43, 52, 59, 76, 86, 87, 90, 91, 94, 96, 98, 98}, 14, 43, 
                  2
              );
              Console.WriteLine(string.Format(
                  "TEST-0...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{64, 66, -36}, 1, 64, 
                  1
              );
              Console.WriteLine(string.Format(
                  "TEST-1...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{0, 0, 0}, 2, 0, 
                  2
              );
              Console.WriteLine(string.Format(
                  "TEST-2...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{9, 85, 34, 43, 70, 96, 44, 7, 27, 33, 34, 5, 91, 84, 76, 45, 20, 37, 15, 37, 20, 24, 13, 49, 74, 13, 50, 81, 81, 66, 23, 36, 91, 80, 61, 15, 96, 70, 90, 25, 16, 62, 75, 63, 6, 65, 38, 12}, 43, 5, 
                  1
              );
              Console.WriteLine(string.Format(
                  "TEST-3...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{-98, -98, -98, -34, -32, -26, -12, 0, 18, 52, 68, 72}, 11, -98, 
                  3
              );
              Console.WriteLine(string.Format(
                  "TEST-4...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1}, 11, 1, 
                  5
              );
              Console.WriteLine(string.Format(
                  "TEST-5...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{1, 3, 6, 6, 10, 12, 15, 16, 21, 22, 23, 29, 33, 37, 40, 40, 43, 52, 55, 59, 64, 65, 71, 72, 80, 83, 86, 86, 88, 88}, 29, 40, 
                  2
              );
              Console.WriteLine(string.Format(
                  "TEST-6...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{-14, -30, -38, -38, -8, 40, -34, 2, -84, 68, -42, 38, -14, 0, -64, 12, -2, -38, -8, -44, -88, -34, -80, -36, 82, 70, 96, -32, 16, -52, -12, -46, -28, -86, 30, -14, 50, -44, 22, 30, -4, 78, 52}, 39, 26, 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-7...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{1, 1, 1, 1}, 2, 3, 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-8...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{11, 50, 1, 93, 12, 7, 55, 35, 36, 62, 61, 71, 16}, 11, 8, 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-9...{0}",
                  result)
              );
          }
      }
  }
  
source_py: def count_number_of_occurrences_or_frequency_in_a_sorted_array(arr, n, x):
      res = 0
      for i in range(n):
          if (x == arr[i]):
              res += 1
      return res
source_cpp: int count_number_of_occurrences_or_frequency_in_a_sorted_array(vector<int> arr, int n, int x) {
    int res = 0;
    for ( int i = 0;
    i < n;
    i ++ ) if ( x == arr [ i ] ) res ++;
    return res;
  }