array-rotation-through-juggling-algorithm.cpp

// C++ program to rotate an array by 
// d elements 
#include <bits/stdc++.h> 
using namespace std; 
  
/*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); 
} 
  
/*Function to left rotate arr[] of siz n by d*/
void leftRotate(int arr[], int d, int n) 
{ 
    for (int i = 0; i < gcd(d, n); i++) { 
        /* move i-th values of blocks */
        int temp = arr[i]; 
        int j = i; 
  
        while (1) { 
            int k = j + d; 
            if (k >= n) 
                k = k - n; 
  
            if (k == i) 
                break; 
  
            arr[j] = arr[k]; 
            j = k; 
        } 
        arr[j] = temp; 
    } 
} 
  
// Function to print an array 
void printArray(int arr[], int size) 
{ 
    for (int i = 0; i < size; i++) 
        cout << arr[i] << " "; 
} 
  
/* Driver program to test above functions */
int main() 
{ 
    int arr[] = { 1, 2, 3, 4, 5, 6, 7 }; 
    int n = sizeof(arr) / sizeof(arr[0]); 
  
    // Function calling 
    leftRotate(arr, 2, n); 
  
  return 0; 
}