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  1. Arrays: Left Rotation
  2. Discussions

Arrays: Left Rotation

  • cc_insp
     + 0 comments

    I used the System.arraycopy() method which was used in the video tutorial. I'm wondering if this solution is more efficient or mine?

    import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int k = in.nextInt();
        int a[] = new int[n];
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = in.nextInt();
        }
        a = leftRotation(n, k, a);
        for (int i=0; i<a.length; i++) {
            System.out.print(a[i]+" ");
        }
    }
    public static int[] leftRotation(int n, int k, int[] a){
        int[] copy = new int[n];
        System.arraycopy(a, k, copy, 0, (n - k));
        System.arraycopy(a, 0, copy, (n - k), (n - (n - k)));
        return copy;
    }
}