LeetCode--371. Sum of Two Integers(兩個整數的和)Python
題目:
給定兩個整數a和b,要求不使用‘+’和‘-’,返回這兩個整數的和。
解題思路:
由於不能使用加減符號,故考慮使用二進位制數的按位與和按位或等操作,已知按位異或可以得到不考慮進位的結果a^b,按位與可以得到進位的情況a&b。所以把進位的結果左移一位,再和異或的結果相加,即可得到最終的結果。而進位左移結果和異或結果相加時,也可能產生進位。故而迴圈上述步驟,直到進位的結果為0時終止。
程式碼(python):
class Solution(object): def getSum(self, a, b): """ :type a: int :type b: int :rtype: int """ while b != 0: carry = a & b a = (a ^ b) b = (carry << 1) return a if a <= 0x7FFFFFFF else a|(~0x100000000+1)
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