Does array represent Heap

PROBLEM :

Given an array, the task is to check if the given array represents a Binary Max-Heap.

Examples:

Input:  A[] = {90, 15, 10, 7, 12, 2}
Output: 1
The given array represents below tree
       90
     /    \
   15      10
  /  \     /
 7    12  2
The tree follows max-heap property as every
node is greater than all of its descendants.

Input:  A[] = {9, 15, 10, 7, 12, 11}
Output: 0
The given array represents below tree
       9
     /    \
   15      10
  /  \     /
 7    12  11
The tree doesn't follows max-heap property 9 is
smaller than 15 and 10, and 10 is smaller than 11.


Input:
The first line of input contains an integer T denoting the no of test cases. Then T test cases follow. Each test case contains two lines. The first line of input contains an integer N denoting the size of the array. Then in the next line are N space separated values of the array.

Output:
For each test case in a new line print 1 if the array could represent the max heap else print a 0.

Constraints:
1<=T<=100
1<=N<=1000
1<=A[]<=1000

Example:
Input:
2
6
90 15 10 7 12 2
6
9 15 10 7 12 11

Output:
1
0

--------------------------------------------------------------------------------
SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

#include<iostream>
using namespace std;

bool IsMaxHeap(int [],int ) ;
int main()
{
int t ;
cin>>t ;
while(t--)
{
   int no ;
   cin>>no ;
 
   int arr[no] ;
   for(int i=0;i<no;i++)
       cin>>arr[i] ;
     
   cout<<IsMaxHeap(arr,no)<<endl ;
}
return 0;
}

bool IsMaxHeap(int arr[],int no)
{
    for(int i=0;i<no;i++)
    {
        if(2*i+1<no&&arr[i]<arr[2*i+1])
            return false ;
        if(2*i+2<no&&arr[i]<arr[2*i+2])
            return false ;
    }
    return true ;
}

--------------------------------------------------------------------------------

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