array rotation program in java
//Rotating array left
//d = number of rotations
static void rotLeft(int[] a, int d)
{
//using secondary array of same size
int [] n = new int[a.length];
//saving element into array n[] according to newlocation of rotations(d)
for(int i = 0; i < a.length; i++)
{
int newlocation = (i+(a.length - d))% a.length;
n[newlocation] = a[i];
}
//printing new rotated array
for(int i = 0; i < a.length; i++)
{
System.out.print(n[i]+ " ");
}
}
// Java program to rotate an array by
// d elements
class RotateArray {
/*Function to left rotate arr[] of siz n by d*/
void leftRotate(int arr[], int d, int n)
{
/* To handle if d >= n */
d = d % n;
int i, j, k, temp;
int g_c_d = gcd(d, n);
for (i = 0; i < g_c_d; i++) {
/* move i-th values of blocks */
temp = arr[i];
j = i;
while (true) {
k = j + d;
if (k >= n)
k = k - n;
if (k == i)
break;
arr[j] = arr[k];
j = k;
}
arr[j] = temp;
}
}
/*UTILITY FUNCTIONS*/
/* function to print an array */
void printArray(int arr[], int size)
{
int i;
for (i = 0; i < size; i++)
System.out.print(arr[i] + " ");
}
/*Fuction to get gcd of a and b*/
int gcd(int a, int b)
{
if (b == 0)
return a;
else
return gcd(b, a % b);
}
// Driver program to test above functions
public static void main(String[] args)
{
RotateArray rotate = new RotateArray();
int arr[] = { 1, 2, 3, 4, 5, 6, 7 };
rotate.leftRotate(arr, 2, 7);
rotate.printArray(arr, 7);
}
}