title: Longest Subarray Count 1S One Count 0S
signature: class Solution {
  
      public int LongestSubarrayCount1SOneCount0S(List<int> arr, int n) {
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 expected){
              try{
                PLACEHOLDER_CLS_NAME solution_cls = new PLACEHOLDER_CLS_NAME();
                int pred_result = solution_cls.PLACEHOLDER_FN_NAME(arr, n); 
                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>{6, 10, 31, 35}, 2, 
                  1
              );
              Console.WriteLine(string.Format(
                  "TEST-0...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{4, 88, -72, 28, -54, 32, -34}, 6, 
                  5
              );
              Console.WriteLine(string.Format(
                  "TEST-1...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{0, 0, 0, 1, 1, 1, 1, 1, 1}, 4, 
                  1
              );
              Console.WriteLine(string.Format(
                  "TEST-2...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{39, 22, 15, 10, 34, 87, 46, 83, 74, 77, 61, 90, 43, 67, 64, 72, 92, 52, 68, 53, 67, 32, 82, 76, 76, 47, 74, 47, 8, 80, 85, 58, 75}, 26, 
                  9
              );
              Console.WriteLine(string.Format(
                  "TEST-3...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{-82, -58, -50, -30, -14, -4, -2, -2, 0, 22, 36, 58, 70, 80, 80, 82, 84, 90}, 14, 
                  11
              );
              Console.WriteLine(string.Format(
                  "TEST-4...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1}, 7, 
                  7
              );
              Console.WriteLine(string.Format(
                  "TEST-5...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{4, 11, 17, 21, 21, 22, 30, 31, 36, 37, 39, 40, 45, 46, 47, 48, 52, 53, 53, 60, 60, 65, 66, 66, 67, 67, 87, 88, 91, 97}, 29, 
                  9
              );
              Console.WriteLine(string.Format(
                  "TEST-6...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{-4, -60, -78, -50, 64, 18, 0, 76, 12, 86, -22}, 7, 
                  6
              );
              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, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 17, 
                  3
              );
              Console.WriteLine(string.Format(
                  "TEST-8...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{4, 39, 50, 37, 71, 66, 55, 34, 1, 41, 34, 99, 69, 31}, 11, 
                  9
              );
              Console.WriteLine(string.Format(
                  "TEST-9...{0}",
                  result)
              );
          }
      }
  }
  
source_py: def longest_subarray_count_1s_one_count_0s(arr, n):
      um = {i: 0 for i in range(10)}
      sum = 0
      maxLen = 0
      for i in range(n):
          if (arr[i] == 0):
              sum += (- 1)
          else:
              sum += 1
          if (sum == 1):
              maxLen = (i + 1)
          elif (sum not in um):
              um[sum] = i
          if ((sum - 1) in um):
              if (maxLen < (i - um[(sum - 1)])):
                  maxLen = (i - um[(sum - 1)])
      return maxLen
source_cpp: int longest_subarray_count_1s_one_count_0s(vector<int> arr, int n) {
    unordered_map < int, int > um;
    int sum = 0, maxLen = 0;
    for ( int i = 0;
    i < n;
    i ++ ) {
      sum += arr [ i ] == 0 ? - 1 : 1;
      if ( sum == 1 ) maxLen = i + 1;
      else if ( um . find ( sum ) == um . end ( ) ) um [ sum ] = i;
      if ( um . find ( sum - 1 ) != um . end ( ) ) {
        if ( maxLen < ( i - um [ sum - 1 ] ) ) maxLen = i - um [ sum - 1 ];
      }
    }
    return maxLen;
  }