Create decode-xored-array.cpp

Author: kamyu104

C++/decode-xored-array.cpp

@@ -0,0 +1,13 @@
+// Time:  O(n)
+// Space: O(1)
+
+class Solution {
+public:
+    vector<int> decode(vector<int>& encoded, int first) {
+        vector<int> result = {first};
+        for (const auto& x: encoded) {
+            result.emplace_back(result.back() ^ x);
+        }
+        return result;
+    }
+};