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liweiwei1419 avatar liweiwei1419 commented on June 6, 2024

要解释清楚,Python 当中 int 一直不会溢出这件事情,还有最后返回的时候,为什么要这样处理。

Python 代码:

class Solution:
    def getSum(self, a: int, b: int) -> int:

        while b:
            # 不进位加法
            temp = a ^ b
            # 考虑进位,同 1 才 1 ,进位体现在左移
            b = (a & b) << 1

            # 在 Python 中,只截取低 32 位,
            # 0xFFFFFFFF 表示的二进制,每个数位都是 1 ,Ox 表示 16 禁止,F 表示 1111,8 个 F 就是 32 个 1
            a = temp & 0xFFFFFFFF

        if a >> 31 == 0:
            return a
        return a - (1 << 32)

参考资料:
https://leetcode-cn.com/problems/sum-of-two-integers/solution/wei-yun-suan-xiang-jie-yi-ji-zai-python-zhong-xu-y/

from leetcode-solutions-in-good-style.

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