昨天在leetcode做题的时候做到了371，原题是这样的：
371. Sum of Two Integers
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 3.371. Sum o
阅读背景：
通过位运算求两个数的和（求解leetcode：371. Sum of Two Integers）
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