题目链接

https://leetcode.cn/problems/decode-xored-array/

知识点：异或

• 相同为0，相异为1

• a ^ b ^ b = a

通过代码

class Solution {
    public int[] decode(int[] encoded, int first) {

        int n = encoded.length + 1;

        int[] ans = new int[n];

        ans[0] = first;

        for (int i = 1; i < n; i++) {
            ans[i] = encoded[i - 1] ^ ans[i - 1];
        }

        return ans;

    }
}