136. Single Number(Solution || Leetcode easy || Java)

Given a non-empty array of integers nums, every element appears twice except for one. Find that single one.

You must implement a solution with a linear runtime complexity and use only constant extra space.

Example 1:

Input: nums = [2,2,1]
Output: 1

Example 2:

Input: nums = [4,1,2,1,2]
Output: 4

Example 3:

Input: nums = [1]
Output: 1

Constraints:

• 1 <= nums.length <= 3 * 104
• -3 * 104 <= nums[i] <= 3 * 104
• Each element in the array appears twice except for one element which appears only once.

SOLUTION:

class Solution {
    public int singleNumber(int[] nums) {
        int ans = nums[0];

//If we Xor every number with each other then we will get the number 
//that is repeated only in a single loop
        for(int i = 1; i < nums.length; i++){
            ans ^= nums[i];
        }

        return ans;
    }
}

Runtime1 ms

Beats

100%

Memory50.7 MB

Beats

36.54%

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