leetcode Single Number
Single Number 題目：https://leetcode.com/problems/single-number/
一個數組中只有一個數字出現一次，其餘的數字都出現兩次，要求時間複雜度是O(n),空間複雜度O(1)
public static void main(String[] args) { int[] arr={4,1,2,1,2}; int result = singleNumber(arr); System.out.println(result); } public static int singleNumber(int[] nums) { int result=0; for(int i=0;i<nums.length;i++){ result^=nums[i]; } return result; }
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