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English Version

题目描述

编写一个函数,不用临时变量,直接交换numbers = [a, b]ab的值。

示例:

输入: numbers = [1,2]
输出: [2,1]

提示:

  • numbers.length == 2

解法

异或运算。

Python3

class Solution:
    def swapNumbers(self, numbers: List[int]) -> List[int]:
        numbers[0], numbers[1] = numbers[1], numbers[0]
        return numbers

Java

class Solution {
    public int[] swapNumbers(int[] numbers) {
        numbers[0] = numbers[0] ^ numbers[1];
        numbers[1] = numbers[0] ^ numbers[1];
        numbers[0] = numbers[0] ^ numbers[1];
        return numbers;
    }
}

...