Leetcode-Question-371: Sum of Two Integers

原文链接:
https://leetcode.com/problems/sum-of-two-integers/

题目描述:
371. Sum of Two Integers
Difficulty: Easy

Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.

Example:
Given a = 1 and b = 2, return 3.

解析:

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