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Solution: Add Strings

Explore how to add two large numbers given as strings without converting them to integers. Learn to implement digit-by-digit addition using pointers and carry handling, replicating the manual math process efficiently. This lesson develops algorithms to handle constraints on numeric operations and understand time and space complexities involved.

Statement

Given two non-negative integers, num1 and num2, represented as strings, return the sum of num1 and num2 as a string.

You must not use any built-in library for handling large integers (such as BigInteger) or directly convert the inputs to integers.

Constraints:

  • 11 \leq ...