title: Position Element Stable Sort
signature: class Solution {
  
      public int PositionElementStableSort(List<int> arr, int n, int idx) {
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 idx, int expected){
              try{
                PLACEHOLDER_CLS_NAME solution_cls = new PLACEHOLDER_CLS_NAME();
                int pred_result = solution_cls.PLACEHOLDER_FN_NAME(arr, n, idx); 
                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>{4, 8, 9, 12, 15, 16, 18, 28, 28, 31, 33, 36, 36, 37, 40, 41, 44, 44, 46, 50, 50, 50, 52, 52, 54, 55, 60, 61, 65, 68, 71, 75, 75, 78, 81, 84, 87, 89, 90, 92, 94, 97, 97, 98, 98, 99}, 37, 32, 
                  32
              );
              Console.WriteLine(string.Format(
                  "TEST-0...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{-16, 86, 94, -86, -38, 64, 96, -64, 94, 10, -10, -62, -50, -46, -62, -32, -4, 72, 14, 36, 74, -66, 46, 82, -44, -22, -26, 16, -8, 0, -90, 94, -50, 22, -82, 8, 92, -84, -34, -36, -66}, 31, 27, 
                  20
              );
              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, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 30, 34, 
                  30
              );
              Console.WriteLine(string.Format(
                  "TEST-2...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{66, 8, 30, 84, 36, 96, 45, 63, 23, 23, 14, 34, 86, 51, 18, 97, 21, 39, 96, 70, 28, 96, 78, 68, 88, 66, 13, 24, 74, 94}, 26, 21, 
                  24
              );
              Console.WriteLine(string.Format(
                  "TEST-3...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{-94, -90, -86, -86, -72, -72, -58, -50, -32, -22, -18, -10, -4, -2, -2, 0, 0, 6, 14, 22, 22, 36, 36, 40, 44, 58, 60, 70, 70, 76, 82, 82, 84, 88, 96}, 17, 31, 
                  17
              );
              Console.WriteLine(string.Format(
                  "TEST-4...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{1, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1}, 30, 36, 
                  14
              );
              Console.WriteLine(string.Format(
                  "TEST-5...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{3, 5, 6, 7, 8, 10, 17, 20, 20, 26, 27, 27, 27, 32, 32, 38, 40, 44, 45, 45, 45, 45, 47, 50, 57, 57, 57, 58, 62, 63, 63, 67, 68, 73, 75, 76, 77, 79, 79, 80, 85, 88, 89, 89, 89, 94, 96, 98}, 42, 35, 
                  35
              );
              Console.WriteLine(string.Format(
                  "TEST-6...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{98, -92, 18, -18, 44, -88, -90, -66, -38, 78, -22, -46, -20, 64, -10, 54}, 14, 12, 
                  7
              );
              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, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 19, 31, 
                  19
              );
              Console.WriteLine(string.Format(
                  "TEST-8...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{14, 17}, 1, 1, 
                  1
              );
              Console.WriteLine(string.Format(
                  "TEST-9...{0}",
                  result)
              );
          }
      }
  }
  
source_py: def position_element_stable_sort(arr, n, idx):
      result = 0
      for i in range(n):
          if (arr[i] < arr[idx]):
              result += 1
          if ((arr[i] == arr[idx]) and (i < idx)):
              result += 1
      return result
source_cpp: int position_element_stable_sort(vector<int> arr, int n, int idx) {
    int result = 0;
    for ( int i = 0;
    i < n;
    i ++ ) {
      if ( arr [ i ] < arr [ idx ] ) result ++;
      if ( arr [ i ] == arr [ idx ] && i < idx ) result ++;
    }
    return result;
  }