Add Strings
Given two non-negative integers num1
and num2
represented as string, return the sum of num1
and num2
.
Note:
- The length of both
num1
andnum2
is < 5100. - Both
num1
andnum2
contains only digits0-9
. - Both
num1
andnum2
does not contain any leading zero. - You must not use any built-in BigInteger library or convert the inputs to integer directly.
Write your solution:
Test Case 1
Input: "63", "181"
Output: "244"
Test Case 2
Input: "11", "1"
Output: "12"
Test Case 3
Input: "1010", "1011"
Output: "2021"