LeetCode Top 100 Liked Questions 136. Single Number (Java版; Easy)
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LeetCode Top 100 Liked Questions 136. Single Number (Java版; Easy)
题目描述
Given a non-empty 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?
Example 1:
Input: [2,2,1]
Output: 1
Example 2:
Input: [4,1,2,1,2]
Output: 4
第一次做; a^a==0
/*
异或
*/
class Solution {
public int singleNumber(int[] nums) {
//problem ensures a non-empty array
int res = 0;
for(int num : nums)
res ^= num;
return res;
}
}
阿里云国内75折 回扣 微信号:monov8 |
阿里云国际,腾讯云国际,低至75折。AWS 93折 免费开户实名账号 代冲值 优惠多多 微信号:monov8 飞机:@monov6 |
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