Web Reference: In-depth solution and explanation for LeetCode 415. Add Strings in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. Add Strings - Given two non-negative integers, num1 and num2 represented as string, return the sum of num1 and num2 as a string. 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. Jan 18, 2017 · Given two non-negative integers, num1 and num2 represented as string, return the sum of num1 and num2 as a string. You must solve the problem without using any built-in library for handling large integers (such as BigInteger).
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Last Updated: April 7, 2026
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