【LeetCode-面试算法经典-Java实现】【136-Single Number(只出现一次的数字)】

【136-Single Number(只出现一次的数字)】


【LeetCode-面试算法经典-Java实现】【所有题目目录索引】

原题

  Given an array of integers, every element appears twice except for one. Find that single one.

  Note:

  Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory?

题目大意

  给定一个数组,每个元素都出现2次除了其中的一个,找出只出现一次的数字注意:算法必须是线性时间复杂度,可以不使用额外空间实现吗?

解题思路

  使用异或运算。

代码实现

算法实现类

public class Solution {

    public int singleNumber(int[] nums) {

        if (nums == null || nums.length < 1) {
            throw new IllegalArgumentException("nums");
        }

        for (int i = 1; i< nums.length; i++) {
            nums[0] ^= nums[i];
        }
        return nums[0];
    }
}

评测结果

  点击图片,鼠标不释放,拖动一段位置,释放后在新的窗口中查看完整图片。

特别说明

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时间: 2024-09-29 08:42:09

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