Find the missing number between 0 to N range

Hello coders, Welcome back to codingbroz! Today you are going to learn an interesting array interview problem i.e. Find the missing number between 0 to n range.

Problem Statement :

Given an array nums containing n distinct numbers in the range [0, n], return the only number in the range that is missing from the array.
Follow up: Could you implement a solution using only O(1) extra space complexity and O(n) runtime complexity?

Example 1:

Input: nums = [3,0,1]

Output: 2

Explanation: n = 3 since there are 3 numbers, so all numbers are in the range [0,3]. 2 is the missing number in the range since it does not appear in nums.

Example 2:

Input: nums = [0,1]

Output: 2

Explanation: n = 2 since there are 2 numbers, so all numbers are in the range [0,2]. 2 is the missing number in the range since it does not appear in nums.

Example 3:

Input: nums = [9,6,4,2,3,5,7,0,1]

Output: 8

Explanation: n = 9 since there are 9 numbers, so all numbers are in the range [0,9]. 8 is the missing number in the range since it does not appear in nums.

Example 4:

Input: nums = [0]

Output: 1

Explanation: n = 1 since there is 1 number, so all numbers are in the range [0,1]. 1 is the missing number in the range since it does not appear in nums.

Now, lets see the solution of Find the missing number between 0 to N

Program in Java to find the missing number between 0 to N :

class Solution {
    public int missingNumber(int[] nums) {
    int sum = 0;
    int n = nums.length;
    for (int num : nums) {
      sum += num;
    }
    int arrSum = (((n + 1)) * n) / 2;
    if (arrSum == sum) return 0;
    else return arrSum - sum;
    }
}

This is How you can Find missing number between 0 to N range. To learn and solve more interview problems read more problems on www.codingbroz.com, Thanks for reading !!!

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