LeetCode 1720. Decode XORed Array

class Solution {
public:
    vector<int> decode(vector<int>& encoded, int first) {
        const int n = encoded.size();
        vector<int> ans(n + 1);
        ans[0] = first;
        for (int i = 0; i < n; ++i) {
            ans[i + 1] = ans[i] ^ encoded[i];
        }
        return ans;
    }
};