add 1720

Author: fishercoder1534

README.md

@@ -8,6 +8,7 @@ _If you like this project, please leave me a star._ ★
 
 |  #  |      Title     |   Solutions   | Video  | Difficulty  | Tag                   
 |-----|----------------|---------------|--------|-------------|-------------
+|1720|[Decode XORed Array](https://leetcode.com/problems/decode-xored-array/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1720.java) ||Easy|Bit Manipulation|
 |1718|[Construct the Lexicographically Largest Valid Sequence](https://leetcode.com/problems/construct-the-lexicographically-largest-valid-sequence/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1718.java) ||Medium|Backtracking, Recursion|
 |1716|[Calculate Money in Leetcode Bank](https://leetcode.com/problems/calculate-money-in-leetcode-bank/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1716.java) ||Easy|Math, Greedy|
 |1711|[Count Good Meals](https://leetcode.com/problems/count-good-meals/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_1711.java) ||Medium|Array, HashTable, Two Pointers|

src/main/java/com/fishercoder/solutions/_1720.java

@@ -0,0 +1,14 @@
+package com.fishercoder.solutions;
+
+public class _1720 {
+    public static class Solution1 {
+        public int[] decode(int[] encoded, int first) {
+            int[] arr = new int[encoded.length + 1];
+            arr[0] = first;
+            for (int i = 0; i < encoded.length; i++) {
+                arr[i + 1] = encoded[i] ^ arr[i];
+            }
+            return arr;
+        }
+    }
+}