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2433. Find The Original Array of Prefix Xor 👍

  • Time: $O(n)$
  • Space: $O(n)$
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class Solution {
 public:
  vector<int> findArray(vector<int>& pref) {
    vector<int> ans(pref.size());

    ans[0] = pref[0];
    for (int i = 1; i < ans.size(); ++i)
      ans[i] = pref[i] ^ pref[i - 1];

    return ans;
  }
};

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class Solution {
  public int[] findArray(int[] pref) {
    int[] ans = new int[pref.length];

    ans[0] = pref[0];
    for (int i = 1; i < ans.length; ++i)
      ans[i] = pref[i] ^ pref[i - 1];

    return ans;
  }
}

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class Solution:
  def findArray(self, pref: List[int]) -> List[int]:
    ans = [0] * len(pref)

    ans[0] = pref[0]
    for i in range(1, len(ans)):
      ans[i] = pref[i] ^ pref[i - 1]

    return ans