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  1. Practice
  2. Data Structures
  3. Arrays
  4. Left Rotation
  5. Discussions

Left Rotation

  • ihateyou + 2 comments

    Is it possible to do the same in C# using only one array (as one array must hold the splitted values and other to place them accordingly) ?

    • ivan_rrr + 0 comments

      It is not the best solution but it requires only one array:

      static void Main(String[] args) {
        string[] read = Console.ReadLine().Split(' ');
        int n = int.Parse(read[0]);
        int d = int.Parse(read[1]);
        int[] array = new int[n];
        array = Array.ConvertAll(Console.ReadLine().Split(' '), Int32.Parse);
        
        for(int q=0;q<d;q++)
            for(int i=0;i<n-1;i++)
            {
                swap(array, i,i+1);
            }
        
        for(int y=0;y<n;y++)
            Console.Write(array[y] + " ");
        Console.WriteLine();
    }
    
    static void swap(int[] input, int indexA, int indexB)
    {
        int tmpA = input[indexA];
        int tmpB = input[indexB];
        input[indexA] = tmpB;
        input[indexB] = tmpA;
    }
    • timm_mason + 1 comment

      This does the rotation in place. 1 line solution.

      for (int i = d; i < d + n; i++) Console.Write($"{a[i%n]} ");

      • mikesmithwick + 0 comments

        The writeup specified that the output was to be printed the array reflecting the rotation. Nothing about having to actually create a rotated array and dump it to the console. And considering the submitter never supplied a stub to the actual rotation routine specifying the return as being an array, this is a legitmate answer. Likely not the one the OP intended.

        If I were to give a coding test to someone I'd toss them something like this. Likely they'd code out a fancy in-place algorithm, in which I would warn them that they were over-engineering the solution for the specified output.