题设：
Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.
解题思路：
使用加法器
代码：
class Solution: def getSum(self, num1, num2): if (num2 == 0): return num1 sum = num1 ^ num2 carry = (num1 & num2) << 1 return self.getSum(sum,carry)
结果：
python本地运行：通过
run code运行：通过，运行时间32ms
submit结果：不通过，报“超出内存限制”
Leetcode - 371. Sum of Two Integers
原文：https://www.cnblogs.com/kaezah/p/9844930.html