Given an array, rotate the array by one position in clock-wise direction.

Below question to rotate an array is taken from GeeksforGeeks platform .

### To rotate an array following are steps :

1) Store last element in a variable say x.

2) Shift all elements one position ahead.

3) Replace first element of array with x.

**Example 1:**

**Input:**
N = 5
A[] = {1, 2, 3, 4, 5}
**Output:**
5 1 2 3 4

**Example 2:**

```
Input:
N = 8
A[] = {9, 8, 7, 6, 4, 2, 1, 3}
Output:
3 9 8 7 6 4 2 1
```

```
```**Your Task:**
You don't need to read input or print anything. Your task is to complete the function rotate() which takes the array A[] and its size N as inputs and modify the array in place.
Expected Time Complexity: O(N)
Expected Auxiliary Space: O(1)
**Constraints**:
1<=N<=105
0<=a[i]<=105

## Solution in Java

```
//{ Driver Code Starts
//Initial Template for Java
import java.util.*;
import java.lang.*;
import java.io.*;
class Technoname {
public static void main(String[] args) throws IOException
{
BufferedReader br =
new BufferedReader(new InputStreamReader(System.in));
int t =
Integer.parseInt(br.readLine().trim()); // Inputting the testcases
while(t-->0)
{
int n = Integer.parseInt(br.readLine().trim());
int a[] = new int[n];
// long getAnswer[] = new long[(int)(n)];
String inputLine[] = br.readLine().trim().split(" ");
for (int i = 0; i < n; i++) {
a[i] = Integer.parseInt(inputLine[i]);
}
Compute obj = new Compute();
obj.rotate(a, n);
StringBuilder output = new StringBuilder();
for(int i=0;i<n;i++)
output.append(a[i]+" ");
System.out.println(output);
}
}
}
// } Driver Code Ends
//User function Template for Java
class Compute {
public void rotate(int a[], int n)
{
int x=a[n-1];
for(int i=n-1;i>0;i--)
{
a[i]=a[i-1];
}
a[0]=x;
}
}
```

**Time Complexity: **O(n), as we need to iterate through all the elements. Where n is the number of elements in the array.**Auxiliary Space: **O(1), as we are using constant space.

Thank you for reading this article so far, if you know some other way to write this program then you can leave a comment here or mail us at technonamecontact@gmail.com, So anyone can a get chance to publish their code on our website. As a result, one can improve knowledge and spread it to others

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