Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.
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【Leetcode】#136 Single Number
Given an array of integers, every element appears twice except for one. Find that single one.
学而不思则罔，思而不学则殆。
Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.
Given an array of integers, every element appears twice except for one. Find that single one.