Interview Shuriken 53: Find the Missing Number

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You are given an array containing ‘n’ distinct numbers taken from the range: [0, n]. Since the array contains only ‘n’ numbers and count of numbers from 0 to n is ‘n+1’, so, you have to find the missing number.

Example 1:

Input: [4, 0, 3, 1]
Output: 2

Example 2:

Input: [8, 3, 5, 2, 4, 6, 0, 1]
Output: 7
Input Format:
The first line of input contains an integer, that denotes the value of n. The following line contains n space separated integers, that denotes the value of array elements.
Constraints:
1 <= N <= 100000
0 <= A[i] <= N 
Time Limit: 0.5 seconds.
Output Format:
The first and only line of output contains the missing number, as described in the task.
Sample Input 1:
6
1 5 6 0 3 2
Sample Output 1:
4


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