Algoritmo de inversión para la rotación de array

 

Dada una array arr[] de tamaño N , la tarea es rotar la array una posición d a la izquierda.

Ejemplos: 

Entrada:  arr[] = {1, 2, 3, 4, 5, 6, 7}, d = 2
Salida: 3, 4, 5, 6, 7, 1, 2
Explicación: si la array se gira 1 posición a la izquierda, 
se convierte en {2, 3, 4, 5, 6, 7, 1}.
Cuando se gira más 1 posición,
se convierte en: {3, 4, 5, 6, 7, 1, 2}

Entrada: arr[] = {1, 6, 7, 8}, d = 3
Salida: 8, 1, 6, 7

 

Complete Interview Preparation - GFG

 

C++

// C++ program for reversal algorithm
// of array rotation
  
#include <bits/stdc++.h>
using namespace std;
  
// Function to reverse arr[] 
// from index start to end
void reverseArray(int arr[], int start, int end)
{
    while (start < end) {
        int temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;
        start++;
        end--;
    }
}
  
// Function to left rotate arr[] of size n by d
void leftRotate(int arr[], int d, int n)
{
    if (d == 0)
        return;
      
    // In case the rotating factor is
    // greater than array length
    d = d % n;
  
    reverseArray(arr, 0, d - 1);
    reverseArray(arr, d, n - 1);
    reverseArray(arr, 0, n - 1);
}
  
// Function to print an array
void printArray(int arr[], int size)
{
    for (int i = 0; i < size; i++)
        cout << arr[i] << " ";
}
  
// Driver code
int main()
{
    int arr[] = { 1, 2, 3, 4, 5, 6, 7 };
    int N = sizeof(arr) / sizeof(arr[0]);
    int d = 2;
  
    // Function call
    leftRotate(arr, d, N);
    printArray(arr, N);
    return 0;
}

C

// C/C++ program for reversal algorithm of array rotation
#include <stdio.h>
  
/*Utility function to print an array */
void printArray(int arr[], int size);
  
/* Utility function to reverse arr[] from start to end */
void reverseArray(int arr[], int start, int end);
  
/* Function to left rotate arr[] of size n by d */
void leftRotate(int arr[], int d, int n)
{
  
    if (d == 0)
        return;
    // in case the rotating factor is
    // greater than array length
    d = d % n;
  
    reverseArray(arr, 0, d - 1);
    reverseArray(arr, d, n - 1);
    reverseArray(arr, 0, n - 1);
}
  
/*UTILITY FUNCTIONS*/
/* function to print an array */
void printArray(int arr[], int size)
{
    int i;
    for (i = 0; i < size; i++)
        printf("%d ", arr[i]);
}
  
/*Function to reverse arr[] from index start to end*/
void reverseArray(int arr[], int start, int end)
{
    int temp;
    while (start < end) {
        temp = arr[start];
        arr[start] = arr[end];
        arr[end] = temp;
        start++;
        end--;
    }
}
  
/* Driver program to test above functions */
int main()
{
    int arr[] = { 1, 2, 3, 4, 5, 6, 7 };
    int n = sizeof(arr) / sizeof(arr[0]);
    int d = 2;
  
    leftRotate(arr, d, n);
    printArray(arr, n);
    return 0;
}

Java

// Java program for reversal algorithm of array rotation
import java.io.*;
  
class LeftRotate {
    /* Function to left rotate arr[] of size n by d */
    static void leftRotate(int arr[], int d)
    {
  
        if (d == 0)
            return;
  
        int n = arr.length;
        // in case the rotating factor is
        // greater than array length
        d = d % n;
        reverseArray(arr, 0, d - 1);
        reverseArray(arr, d, n - 1);
        reverseArray(arr, 0, n - 1);
    }
  
    /*Function to reverse arr[] from index start to end*/
    static void reverseArray(int arr[], int start, int end)
    {
        int temp;
        while (start < end) {
            temp = arr[start];
            arr[start] = arr[end];
            arr[end] = temp;
            start++;
            end--;
        }
    }
  
    /*UTILITY FUNCTIONS*/
    /* function to print an array */
    static void printArray(int arr[])
    {
        for (int i = 0; i < arr.length; i++)
            System.out.print(arr[i] + " ");
    }
  
    /* Driver program to test above functions */
    public static void main(String[] args)
    {
        int arr[] = { 1, 2, 3, 4, 5, 6, 7 };
        int n = arr.length;
        int d = 2;
  
        leftRotate(arr, d); // Rotate array by d
        printArray(arr);
    }
}
/*This code is contributed by Devesh Agrawal*/

Python3

# Python program for reversal algorithm of array rotation
  
# Function to reverse arr[] from index start to end
  
  
def reverseArray(arr, start, end):
    while (start < end):
        temp = arr[start]
        arr[start] = arr[end]
        arr[end] = temp
        start += 1
        end = end-1
  
# Function to left rotate arr[] of size n by d
  
  
def leftRotate(arr, d):
  
    if d == 0:
        return
    n = len(arr)
    # in case the rotating factor is
    # greater than array length
    d = d % n
    reverseArray(arr, 0, d-1)
    reverseArray(arr, d, n-1)
    reverseArray(arr, 0, n-1)
  
# Function to print an array
  
  
def printArray(arr):
    for i in range(0, len(arr)):
        print (arr[i],end=' ')
  
  
# Driver function to test above functions
arr = [1, 2, 3, 4, 5, 6, 7]
n = len(arr)
d = 2
  
leftRotate(arr, d)  # Rotate array by 2
printArray(arr)
  
# This code is contributed by Devesh Agrawal

C#

// C# program for reversal algorithm
// of array rotation
using System;
  
class GFG {
    /* Function to left rotate arr[]
    of size n by d */
    static void leftRotate(int[] arr, int d)
    {
  
        if (d == 0)
            return;
        int n = arr.Length;
          // in case the rotating factor is
        // greater than array length
        d = d % n;
        reverseArray(arr, 0, d - 1);
        reverseArray(arr, d, n - 1);
        reverseArray(arr, 0, n - 1);
    }
  
    /* Function to reverse arr[] from
    index start to end*/
    static void reverseArray(int[] arr, int start,
                             int end)
    {
        int temp;
        while (start < end) {
            temp = arr[start];
            arr[start] = arr[end];
            arr[end] = temp;
            start++;
            end--;
        }
    }
  
    /*UTILITY FUNCTIONS*/
    /* function to print an array */
    static void printArray(int[] arr)
    {
        for (int i = 0; i < arr.Length; i++)
            Console.Write(arr[i] + " ");
    }
  
    // Driver code
    public static void Main()
    {
        int[] arr = { 1, 2, 3, 4, 5, 6, 7 };
        int n = arr.Length;
        int d = 2;
  
        leftRotate(arr, d); // Rotate array by 2
        printArray(arr);
    }
}
  
// This code is contributed by Sam007

PHP

<?php
// PHP program for reversal 
// algorithm of array rotation
  
/* Function to left rotate
   arr of size n by d */
function leftRotate(&$arr, $d, $n)
{
  
    if ($d == 0)
        return;
      // in case the rotating factor is
      // greater than array length
      $d = ($d % $n);
    reverseArray($arr, 0, $d - 1);
    reverseArray($arr, $d, $n - 1);
    reverseArray($arr, 0, $n - 1);
}
  
/*Function to reverse $arr
  from index start to end*/
function reverseArray(&$arr, 
                       $start, $end)
{
    while ($start < $end)
    {
        $temp = $arr[$start];
        $arr[$start] = $arr[$end];
        $arr[$end] = $temp;
        $start++;
        $end--;
    }
}
  
// Function to 
// print an array 
function printArray($arr, $size)
{
    for ($i = 0; $i < $size; $i++)
    print $arr[$i]." ";
}
  
// Driver code
$arr = array(1, 2, 3, 
             4, 5, 6, 7);
$n = sizeof($arr);
$d = 2;
  
// Function calling
leftRotate($arr, $d, $n);
printArray($arr, $n);
      
// This code is contributed
// by ChitraNayal
?>

Javascript

<script>
      // JavaScript program for reversal algorithm
      // of array rotation
  
      /*Function to reverse arr[] from index start to end*/
      function reverseArray(arr, start, end) {
        while (start < end) {
          var temp = arr[start];
          arr[start] = arr[end];
          arr[end] = temp;
          start++;
          end--;
        }
      }
  
      /* Function to left rotate arr[] of size n by d */
      function leftRotate(arr, d, n) {
        if (d == 0) return;
        // in case the rotating factor is
        // greater than array length
        d = d % n;
  
        reverseArray(arr, 0, d - 1);
        reverseArray(arr, d, n - 1);
        reverseArray(arr, 0, n - 1);
      }
  
      // Function to print an array
      function printArray(arr, size) 
      {
        for (var i = 0; i < size; i++) document.write(arr[i] + " ");
      }
  
      /* Driver program to test above functions */
  
      var arr = [1, 2, 3, 4, 5, 6, 7];
      var n = arr.length;
      var d = 2;
  
      // Function calling
      leftRotate(arr, d, n);
      printArray(arr, n);
        
      // This code is contributed by rdtank.
    </script>

Publicación traducida automáticamente

Artículo escrito por GeeksforGeeks-1 y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA

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