面试题 16.01. 交换数字
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
-2147483647 <= numbers[i] <= 2147483647
题解1:
a 与 b 互换,
a=a+b
b=a-b
a=a-b
class Solution {
public int[] swapNumbers(int[] numbers) {
if (numbers[0] == numbers[1]) return numbers;
numbers[0] = numbers[0] + numbers[1];
numbers[1] = numbers[0] - numbers[1];
numbers[0] = numbers[0] - numbers[1];
return numbers;
}
}
题解2:
使用异或
class Solution {
public int[] swapNumbers(int[] numbers) {
if (numbers[0] == numbers[1]) return numbers;
numbers[0] = numbers[0] ^ numbers[1];
numbers[1] = numbers[0] ^ numbers[1];
numbers[0] = numbers[0] ^ numbers[1];
return numbers;
}
}