- 描述
编写一个函数,不用临时变量,直接交换numbers = [a, b]
中a
与b
的值。
- 示例:
输入: numbers = [1,2]
输出: [2,1]
提示:
numbers.length == 2
- Solution One
简单的加法交换
class Solution {
public int[] swapNumbers(int[] numbers) {
numbers[0] += numbers[1];
numbers[1] = numbers[0] - numbers[1];
numbers[0] = numbers[0] - numbers[1];
return numbers;
}
}
- Solution Two
异或运算
class Solution {
public int[] swapNumbers(int[] numbers) {
numbers[0] ^= numbers[1];
numbers[1] ^= numbers[0];
numbers[0] ^= numbers[1];
return numbers;
}
}