Add Strings Java Leetcode 415 UxxShLfL6kc

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. We use two pointers \ (i\) and \ (j\) to point to the end of the two strings respectively, and start adding bit by bit from the end. Each time we take out the corresponding digits \ (a\) and \ (b\), calculate their sum \ (a + b + c\), where \ (c\) represents the carry from the last addition.

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