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Multiply Strings

Moderate
0/80
Average time to solve is 35m
52 upvotes
Asked in companies
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Problem statement

You are given two big numbers ‘A’ and ‘B’ as strings. Your task is to find the product of both the numbers.

Note:

There are no leading zeros in both the strings, except the number 0 itself.
Do not use any built-in Big Integer Library.
For Example:
If, A = 123, and B = 456.
So the product of both numbers will be 56088.
Detailed explanation ( Input/output format, Notes, Images )
Constraints:
1 <= T <= 100
1 <= |A|, |B| <= 100

where |A| and |B| denote the length of string, ‘A’ and ‘B’ respectively.   
All the characters of the string ‘A’ and ‘B’ contain digits only.

Time limit: 1 second
Sample Input 1:
2
17281 
91276
123
456
Sample Output 1:
1577340556
56088    
Explanation for sample 1:
For the first test case:
A=17281, and B=91276
The product of both numbers is 1577340556.

For the second test case:
A=123, B=456
The product of both numbers is 56088
Sample Input 2:
1
5
10
Sample output 2:
50
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