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  1. Practice
  2. Data Structures
  3. Arrays
  4. Arrays - DS
  5. Discussions

Arrays - DS

  • rajarshi356 + 6 comments

    Its very easy passed all the test cases

    import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        int n,i,b,j;
        Scanner sc=new Scanner(System.in);
        n=sc.nextInt();
        int[] a=new int[n];
        for(i=0;i<n;i++){
            a[i]=sc.nextInt();
        }
        for(j=a.length-1;j>=0;j--){
            System.out.print(a[j]+" ");
        }
    }
}
    • jasonganub + 1 comment

      Looks good! To make this even faster, you should loop through n/2 items and swap a[i] with a[n-1-i].

      • _hemant + 2 comments

        can you show this using codes?

        • jasonganub + 1 comment

          I have my code submitted above in the discussion area.

          My way permanently makes it reverse. If the interviewer asked to reverse the array, then this solution would not work since it does not reverse it, but it prints it in reverse. If they just want it to print in reverse, then rajarshi356's works fine.

          • jasonganub + 2 comments
            for i in range(0, n//2):
    temp = arr[i]
    arr[i] = arr[-1-i]
    arr[-1-i] = temp
    
result = ""
for i in arr:
    result = result + str(i) + " "

print(result)
            • thulasiram_vall1 + 0 comments

              Don't this add more operations to the logic.

            • dtyagi1 + 0 comments

              n = int(raw_input().strip())

              arr = map(int,raw_input().strip().split(' '))

              result=""

              for i in range(n):

              result=result+str(arr[n-1-i])+" "

              print result

        • mohamedyousfi74 + 0 comments

          the using code donètwork it only show the secret page help plz

    • ashi_rais + 0 comments

      problem says to read array element from Line- 4 (size) 1 2 3 4 ( array elements are all in one line)

      but in your code you are reading it like

      4 (size) 1 2 3 4

      need to use scanner.nextLine()

    • h2084772909 + 0 comments

      first intput and last output,your code is easy to understand and most userful.

    • ashish_pathania1 + 1 comment

      why am i using a.length-1 and not a.length

      • rajarshi356 + 0 comments

        Since array start from 0 index so we are using the same

    • dziadevich + 0 comments
      for(;n>0;)
      System.out.print(arr[--n] + " ");
    • jeya28798 + 1 comment

      is any inbuild functions available for reverse a string in java

      • mayank113463 + 0 comments

        no! you have to convert string into stringbuilder or stringbuffer