Timer is Running

You are given an array arr[] of N integers including 0. The task is to find the smallest positive number missing from the array.

Example 1:

Input:
N = 5
arr[] = {1,2,3,4,5}
Output: 6
Explanation: Smallest positive missing 
number is 6.

Example 2:

Input:
N = 5
arr[] = {0,-10,1,3,-20}
Output: 2
Explanation: Smallest positive missing 
number is 2.

Your Task:
The task is to complete the function missingNumber() which returns the smallest positive missing number in the array.

Expected Time Complexity: O(N).
Expected Auxiliary Space: O(1).

Constraints:
1 <= N <= 106
-106 <= arr[i] <= 106

 

** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Saksham Raj Seth
Author: saksham seth


If you have purchased any course from GeeksforGeeks then please ask your doubt on course discussion forum. You will get quick replies from GFG Moderators there.



Need help with your code? Please use ide.geeksforgeeks.org, generate link and share the link here.


to report an issue on this page.