First Digit
Medium Accuracy: 12.1% Submissions: 124 Points: 4

Given an array arr[] of size N, find the first digit from the left of the product of these N integers.

Example 1:

Input: N = 4, arr[] = {5, 8, 3, 7}
Output: 8
Explanation: Produt is 840

Example 2:

Input: N = 3, arr[] = {6, 7, 9} 
Output: 3
Explanation: Produt is 378


Your Task:
You don't need to read input or print anything. Your task is to complete the function firstDigit() which takes N and array arr[] as input parameters and returns the left digit of product.

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

1 ≤ N, arr[i] ≤ 105

to report an issue on this page.


We strongly recommend solving this problem on your own before viewing its editorial. Do you still want to view the editorial?


All Submissions

My Submissions:

Login to access your submissions.

First Digit

Output Window