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### by Sumit Chourasia | Jun 21, 2020 | Category :coding | Tags : arrayडेटा-संरचनाleetcodec-sharpalgorithmआसान

#### XOR Operation in an Array - Easy - LeetCode - मिनी टीवी

Given an integer n and an integer start.

Define an array nums where nums[i] = start + 2*i (0-indexed) and n == nums.length.

Return the bitwise XOR of all elements of nums.

Example 1:

Input: n = 5, start = 0

Output: 8

Explanation: Array nums is equal to [0, 2, 4, 6, 8] where (0 ^ 2 ^ 4 ^ 6 ^ 8) = 8.

Where "^" corresponds to bitwise XOR operator.

Example 2:

Input: n = 4, start = 3

Output: 8

Explanation: Array nums is equal to [3, 5, 7, 9] where (3 ^ 5 ^ 7 ^ 9) = 8.

Example 3:

Input: n = 1, start = 7

Output: 7

Example 4:

Input: n = 10, start = 5

Output: 2

Constraints:

1 <= n <= 1000

0 <= start <= 1000

n == nums.length

Solution:

``````using System;
using System.Collections.Generic;
using System.Text;

{
public class XorOperationSoln
{
public int XorOperation(int n, int start)
{
int num = 0;
int xor = 0;
for (int i = 0; i < n; i++)
{
num = start + 2 * i;
xor = xor ^ num;
}

return xor;
}
}
}
``````

Time Complexity: O(n)

Space Complexity: O(1)

Unit Tests:

``````using LeetCode.AskGif.Easy.Array;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using System.Collections.Generic;
using System.Text;

namespace CodingUnitTest.Easy.Array
{
[TestClass]
public class XorOperationSolnTests
{
[TestMethod]
public void XorOperationSoln_First()
{
var n = 5;
var start = 0;
var expected = 8;

var res = new XorOperationSoln().XorOperation(n, start);
Assert.AreEqual(expected, res);
}

[TestMethod]
public void XorOperationSoln_Second()
{
var n = 4;
var start = 3;
var expected = 8;

var res = new XorOperationSoln().XorOperation(n, start);
Assert.AreEqual(expected, res);
}

[TestMethod]
public void XorOperationSoln_Third()
{
var n = 1;
var start = 7;
var expected = 7;

var res = new XorOperationSoln().XorOperation(n, start);
Assert.AreEqual(expected, res);
}

[TestMethod]
public void XorOperationSoln_Fourth()
{
var n = 10;
var start = 5;
var expected = 2;

var res = new XorOperationSoln().XorOperation(n, start);
Assert.AreEqual(expected, res);
}

}
}
``````

Contributed By: Sumit Chourasia
Contributed By: Sumit Chourasia
Contributed By: Sumit Chourasia
Contributed By: Sumit Chourasia