Single Number
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
class Solution {
public int singleNumber(int[] nums) {
int x = nums[0];
for (int i = 1; i < nums.length; i++) {
x = x ^ nums[i];
}
return x;
}
}
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