title: How To Check If A Given Array Represents A Binary Heap 1
signature: class Solution {
  
      public bool HowToCheckIfAGivenArrayRepresentsABinaryHeap1(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(bool actual, bool expected){
              return new JavaScriptSerializer().Serialize(actual) == new JavaScriptSerializer().Serialize(expected);
          }
  
          public string driver(List<int> arr, int n, bool expected){
              try{
                PLACEHOLDER_CLS_NAME solution_cls = new PLACEHOLDER_CLS_NAME();
                bool 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>{2, 2, 2, 7, 10, 14, 24, 38, 42, 50, 59, 60, 72, 73, 79, 83, 89}, 9, 
                  false
              );
              Console.WriteLine(string.Format(
                  "TEST-0...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{-48, 98, 96, -56, -2, 58, 52, -50, 58, 50, 62, 86, -26, -98, 34, 20, -28, 56, -36}, 9, 
                  false
              );
              Console.WriteLine(string.Format(
                  "TEST-1...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 20, 
                  false
              );
              Console.WriteLine(string.Format(
                  "TEST-2...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{91, 50, 37}, 2, 
                  true
              );
              Console.WriteLine(string.Format(
                  "TEST-3...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{-80, -26, 0, 0, 6, 14, 22, 76, 82, 88, 98}, 10, 
                  false
              );
              Console.WriteLine(string.Format(
                  "TEST-4...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{1, 0}, 1, 
                  true
              );
              Console.WriteLine(string.Format(
                  "TEST-5...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{9, 24, 24, 33, 48, 50, 55, 61, 69, 79, 83}, 8, 
                  false
              );
              Console.WriteLine(string.Format(
                  "TEST-6...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{30, 32, -82, -48, 88, -24, 74, 2, 90, 98, 68, 82, 32, -60, 2, -94, 18, 14, 46, 50, -60, -74, -76, 66, -76, -34, -20, 82, -44, -62, 34, 48, -56, 2, 64, -78, -64, 98, -10, -28, 78, -42}, 27, 
                  false
              );
              Console.WriteLine(string.Format(
                  "TEST-7...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 6, 
                  false
              );
              Console.WriteLine(string.Format(
                  "TEST-8...{0}",
                  result)
              );result = runner.driver(
                  new List<int>{38, 74, 99, 75, 44, 75, 24, 70, 78, 74, 60, 59, 34, 27, 7, 23, 19, 95, 4, 35, 38, 22, 46, 1, 44, 20, 52, 1, 96, 57, 5, 76, 49, 1, 37, 35}, 31, 
                  false
              );
              Console.WriteLine(string.Format(
                  "TEST-9...{0}",
                  result)
              );
          }
      }
  }
  
source_py: def how_to_check_if_a_given_array_represents_a_binary_heap_1(arr, n):
      for i in range((int(((n - 2) / 2)) + 1)):
          if (arr[((2 * i) + 1)] > arr[i]):
              return False
          if ((((2 * i) + 2) < n) and (arr[((2 * i) + 2)] > arr[i])):
              return False
      return True
source_cpp: bool how_to_check_if_a_given_array_represents_a_binary_heap_1(vector<int> arr, int n) {
    for ( int i = 0;
    i <= ( n - 2 ) / 2;
    i ++ ) {
      if ( arr [ 2 * i + 1 ] > arr [ i ] ) return false;
      if ( 2 * i + 2 < n && arr [ 2 * i + 2 ] > arr [ i ] ) return false;
    }
    return true;
  }