title: Count Pairs Two Sorted Arrays Whose Sum Equal Given Value X 2
signature: class Solution {
  
      public int CountPairsTwoSortedArraysWhoseSumEqualGivenValueX2(List<int> arr1, List<int> arr2, int m, 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> arr1, List<int> arr2, int m, int n, int x, int expected){
              try{
                PLACEHOLDER_CLS_NAME solution_cls = new PLACEHOLDER_CLS_NAME();
                int pred_result = solution_cls.PLACEHOLDER_FN_NAME(arr1, arr2, m, 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>{5, 5, 7, 10, 14, 14, 17, 21, 32, 34, 37, 40, 40, 40, 46, 46, 50, 50, 51, 55, 57, 62, 65, 67, 67, 69, 70, 70, 72, 73, 76, 77, 77, 78, 84, 85, 85, 86, 87, 88, 88, 89, 89, 90, 93, 99}, new List<int>{2, 5, 8, 8, 10, 12, 13, 15, 17, 18, 20, 20, 21, 27, 28, 31, 34, 37, 40, 46, 48, 52, 53, 54, 54, 58, 59, 60, 66, 68, 68, 69, 70, 71, 72, 73, 77, 77, 80, 84, 84, 92, 92, 95, 97, 97}, 28, 29, 23, 
                  3
              );
              Console.WriteLine(string.Format(
                  "TEST-0...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{-84, 52, -34, 96, 16, 92, -64, -74}, new List<int>{-22, 26, -12, -54, 66, 86, 38, 76}, 6, 5, 7, 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-1...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{0, 0, 0, 0, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, new List<int>{0, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 37, 26, 42, 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-2...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{60, 92, 42, 83, 55, 76, 29, 62}, new List<int>{71, 2, 74, 42, 80, 71, 26, 76}, 4, 7, 7, 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-3...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{-94, -94, -58, -40, -40, -26, -24, -22, -22, -22, -2, 0, 4, 8, 12, 16, 16, 18, 22, 32, 42, 44, 50, 58, 64, 78, 80, 90}, new List<int>{-86, -84, -78, -76, -72, -70, -62, -58, -54, -54, -50, -46, -44, -40, -30, -28, -16, -10, 10, 36, 36, 48, 70, 84, 84, 90, 94, 98}, 17, 27, 17, 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-4...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{0, 0, 1, 1, 1, 0, 0, 1, 1, 1}, new List<int>{1, 1, 1, 0, 1, 1, 0, 0, 0, 0}, 5, 8, 9, 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-5...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{1, 5, 7, 7, 7, 14, 15, 16, 17, 18, 18, 19, 20, 25, 27, 31, 36, 42, 47, 51, 56, 56, 56, 58, 58, 59, 63, 63, 63, 65, 66, 67, 76, 83, 93, 94, 97}, new List<int>{2, 3, 7, 8, 9, 10, 17, 18, 21, 28, 29, 29, 33, 35, 46, 47, 47, 49, 49, 49, 53, 56, 58, 59, 59, 60, 65, 67, 70, 78, 81, 85, 85, 87, 90, 92, 96}, 28, 34, 31, 
                  1
              );
              Console.WriteLine(string.Format(
                  "TEST-6...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{78, -74, 52, 56, -8, 92, 14, 56, -72, -92, 32, -94, -26, -8, -66, 72, -24, 36, -84, -4, -68, 14, 78, 40, -82, -10, 16, 56, 6, -16, 30, 24, -32}, new List<int>{-74, 22, -14, -2, 36, 86, -70, -20, -76, -84, -40, -36, 42, 22, -60, -94, -18, 8, -14, -42, -68, 62, -60, 2, 40, -66, 68, 96, 70, 98, -38, -74, -92}, 16, 30, 24, 
                  1
              );
              Console.WriteLine(string.Format(
                  "TEST-7...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{0, 0, 0, 0, 0, 0, 0, 0, 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}, new List<int>{0, 0, 0, 0, 0, 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}, 25, 33, 33, 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-8...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{17, 50, 65, 4, 19, 10, 45, 70, 76, 81, 28, 97, 55, 70, 38, 2, 40, 67, 36, 33, 6, 85, 25}, new List<int>{78, 92, 65, 23, 7, 94, 18, 4, 2, 53, 31, 58, 98, 18, 46, 16, 17, 92, 80, 92, 43, 70, 50}, 16, 22, 22, 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-9...{0}",
                  result)
              );
          }
      }
  }
  
source_py: def count_pairs_two_sorted_arrays_whose_sum_equal_given_value_x_2(arr1, arr2, m, n, x):
      (count, l, r) = (0, 0, (n - 1))
      while ((l < m) and (r >= 0)):
          if ((arr1[l] + arr2[r]) == x):
              l += 1
              r -= 1
              count += 1
          elif ((arr1[l] + arr2[r]) < x):
              l += 1
          else:
              r -= 1
      return count
source_cpp: int count_pairs_two_sorted_arrays_whose_sum_equal_given_value_x_2(vector<int> arr1, vector<int> arr2, int m, int n, int x) {
    int count = 0;
    int l = 0, r = n - 1;
    while ( l < m && r >= 0 ) {
      if ( ( arr1 [ l ] + arr2 [ r ] ) == x ) {
        l ++;
        r --;
        count ++;
      }
      else if ( ( arr1 [ l ] + arr2 [ r ] ) < x ) l ++;
      else r --;
    }
    return count;
  }