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Shuffle the Array - Easy - LeetCode - MiniTV

Shuffle the Array - Easy - LeetCode - मिनी टीवी

Given the array nums consisting of 2n elements in the form [x1,x2,...,xn,y1,y2,...,yn].

Return the array in the form [x1,y1,x2,y2,...,xn,yn].

 

Example 1:

Input: nums = [2,5,1,3,4,7], n = 3

Output: [2,3,5,4,1,7] 

Explanation: Since x1=2, x2=5, x3=1, y1=3, y2=4, y3=7 then the answer is [2,3,5,4,1,7].

 

Example 2:

Input: nums = [1,2,3,4,4,3,2,1], n = 4

Output: [1,4,2,3,3,2,4,1]

 

Example 3:

Input: nums = [1,1,2,2], n = 2

Output: [1,2,1,2]

 

Constraints:

1 <= n <= 500

nums.length == 2n

1 <= nums[i] <= 10^3

 

Solution:

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

namespace LeetCode.AskGif.Easy.Array
{
    public class ShuffleSoln
    {
        public int[] Shuffle(int[] nums, int n)
        {
            var res = new int[nums.Length];
            var index = 0;
            for (int i = 0, j = n; j < nums.Length; i++, j++)
            {
                res[index] = nums[i];
                index++;
                res[index] = nums[j];
                index++;
            }

            return res;
        }
    }
}

 

Time Complexity: O(n)

Space Complexity: O(n)

 

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 ShuffleSolnTests
    {
        [TestMethod]
        public void ShuffleSoln_First()
        {
            var nums = new int[] { 2, 5, 1, 3, 4, 7 };
            var n = 3;
            var output = new int[] { 2, 3, 5, 4, 1, 7 };
            var res = new ShuffleSoln().Shuffle(nums, n);

            AreEqual(res, output);
        }

        [TestMethod]
        public void ShuffleSoln_Second()
        {
            var nums = new int[] { 1, 2, 3, 4, 4, 3, 2, 1 };
            var n = 4;
            var output = new int[] { 1, 4, 2, 3, 3, 2, 4, 1 };
            var res = new ShuffleSoln().Shuffle(nums, n);

            AreEqual(res, output);
        }

        [TestMethod]
        public void ShuffleSoln_Third()
        {
            var nums = new int[] { 1, 1, 2, 2 };
            var n = 2;
            var output = new int[] { 1, 2, 1, 2 };
            var res = new ShuffleSoln().Shuffle(nums, n);

            AreEqual(res, output);
        }

        private void AreEqual(int[] res, int[] output)
        {
            Assert.AreEqual(res.Length, output.Length);

            for (int i = 0; i < res.Length; i++)
            {
                Assert.AreEqual(res[i], output[i]);
            }
        }
    }
}