{ "data": { "question": { "questionId": "415", "questionFrontendId": "415", "boundTopicId": null, "title": "Add Strings", "titleSlug": "add-strings", "content": "

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

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You must solve the problem without using any built-in library for handling large integers (such as BigInteger). You must also not convert the inputs to integers directly.

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Example 1:

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\nInput: num1 = "11", num2 = "123"\nOutput: "134"\n
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Example 2:

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\nInput: num1 = "456", num2 = "77"\nOutput: "533"\n
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Example 3:

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\nInput: num1 = "0", num2 = "0"\nOutput: "0"\n
\n\n

 

\n

Constraints:

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