Package g1701_1800.s1720_decode_xored_array

Class Solution

java.lang.Object

g1701_1800.s1720_decode_xored_array.Solution

public class Solution
extends Object

1720 - Decode XORed Array.<p>Easy</p> <p>There is a <strong>hidden</strong> integer array <code>arr</code> that consists of <code>n</code> non-negative integers.</p> <p>It was encoded into another integer array <code>encoded</code> of length <code>n - 1</code>, such that <code>encoded[i] = arr[i] XOR arr[i + 1]</code>. For example, if <code>arr = [1,0,2,1]</code>, then <code>encoded = [1,2,3]</code>.</p> <p>You are given the <code>encoded</code> array. You are also given an integer <code>first</code>, that is the first element of <code>arr</code>, i.e. <code>arr[0]</code>.</p> <p>Return <em>the original array</em> <code>arr</code>. It can be proved that the answer exists and is unique.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> encoded = [1,2,3], first = 1</p> <p><strong>Output:</strong> [1,0,2,1]</p> <p><strong>Explanation:</strong> If arr = [1,0,2,1], then first = 1 and encoded = [1 XOR 0, 0 XOR 2, 2 XOR 1] = [1,2,3]</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> encoded = [6,2,7,3], first = 4</p> <p><strong>Output:</strong> [4,2,0,7,4]</p> <p><strong>Constraints:</strong></p> <ul> <li><code>2 <= n <= 10⁴</code></li> <li><code>encoded.length == n - 1</code></li> <li><code>0 <= encoded[i] <= 10⁵</code></li> <li><code>0 <= first <= 10⁵</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int[]	decode(int[] encoded, int first)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

decode

public int[] decode(int[] encoded,
 int first)