Sort an array which contain 1 to n values

You have given an array which contain 1 to n element, your task is to sort this array in an efficient way and without replace with 1 to n numbers.

Examples :

Input : arr[] = {10, 7, 9, 2, 8, 
                 3, 5, 4, 6, 1};
Output : 1 2 3 4 5 6 7 8 9 10

Native approach :
Sort this array with the use of any type of sorting method. it takes O(nlogn) minimum time.

Efficient approach :
Replace every element with it’s position. it takes O(n) efficient time and give you the sorted array. Let’s understand this approach with the code below.

C++

filter_none

edit
close

play_arrow

link
brightness_4
code

// Efficient C++ program to sort an array of
// numbers in range from 1 to n.
#include <iostream>
  
using namespace std;
  
// function for sort array
void sortit(int arr[], int n)
{
    for (int i = 0; i < n; i++) {
      arr[i]=i+1;
    }
}
  
// Driver code
int main()
{
    int arr[] = { 10, 7, 9, 2, 8, 3, 5, 4, 6, 1 };
    int n = sizeof(arr) / sizeof(arr[0]);
  
    // for sort an array
    sortit(arr, n);
  
    // for print all the element in sorted way
    for (int i = 0; i < n; i++) 
        cout << arr[i] << " ";    
}

chevron_right






                        filter_none









Java














                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















// Efficient Java program to sort an  


// array of numbers in range from 1 


// to n. 


import java.io.*; 


import java.util.*; 


  


public class GFG { 


      


          


    // function for sort array 


    static void sortit(int []arr, int n) 


    { 


        for (int i = 0; i < n; i++)  


        { 


            arr[i]=i+1; 


      


              


        } 


    } 


      


    // Driver code 


    public static void main(String args[]) 


    { 


        int []arr = {10, 7, 9, 2, 8,  


                            3, 5, 4, 6, 1}; 


        int n = arr.length; 


      


        // for sort an array 


        sortit(arr, n); 


      


        // for print all the  


        // element in sorted way 


        for (int i = 0; i < n; i++)  


            System.out.print(arr[i] + " ");  


    } 


} 


  


// This code is contributed by Manish Shaw  


// (manishshaw1) 



















                        chevron_right







                        filter_none









Python3














                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















# Python3 program to sort an array of  


# numbers in range from 1 to n.  


  


# function for sort array  


def sortit(arr,n): 


    for i in range(n): 


        arr[i] = i+1


  


# Driver code 


if __name__=='__main__': 


    arr = [10, 7, 9, 2, 8, 3, 5, 4, 6, 1 ] 


    n = len(arr) 


  


    # for sort an array  


    sortit(arr,n) 


  


    # for print all the element  


    # in sorted way  


    for i in range(n): 


        print(arr[i],end=" ") 


   


# This code is contributed by  


# Shrikant13  



















                        chevron_right







                        filter_none









C#














                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















// Efficient C# program to sort an array of 


// numbers in range from 1 to n. 


using System; 


using System.Collections.Generic; 


  


class GFG { 


      


          


    // function for sort array 


    static void sortit(int []arr, int n) 


    { 


        for (int i = 0; i < n; i++)  


        { 


      


            arr[i]=i+1; 


        } 


    } 


      


    // Driver code 


    public static void Main() 


    { 


        int []arr = {10, 7, 9, 2, 8,  


                      3, 5, 4, 6, 1}; 


        int n = arr.Length; 


      


        // for sort an array 


        sortit(arr, n); 


      


        // for print all the  


        // element in sorted way 


        for (int i = 0; i < n; i++)  


            Console.Write(arr[i] + " ");  


    } 


} 


  


// This code is contributed by  


// Manish Shaw (manishshaw1) 



















                        chevron_right







                        filter_none









PHP














                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















<?php 


// Efficient PHP program to sort an  


// array of numbers in range from 1 to n. 


  


  


// function for sort array 


function sortit(&$arr, $n) 


{ 


    for ($i = 0; $i < $n; $i++)  


    { 


  


        $arr[$i]=$i+1;   


    } 


} 


  


// Driver code 


$arr = array(10, 7, 9, 2, 8,  


             3, 5, 4, 6, 1); 


$n = count($arr); 


  


// for sort an array 


sortit($arr, $n); 


  


// for print all the 


// element in sorted way 


for ($i = 0; $i < $n; $i++)  


    echo $arr[$i]." "; 


  


//This code is contributed by Manish Shaw 


//(manishshaw1) 


?> 



















                        chevron_right







                        filter_none











Output :


1 2 3 4 5 6 7 8 9 10






          
          
          
          

            

    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts:
DevanshuAgarwal
Check out this Author's contributed articles.
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on  the "Improve Article" button below.



      
      
      
      

      

      
					
		

    Article Tags : 
Arrays
Sorting

           	
Practice Tags : 
Arrays
Sorting

        

         

         
 
         
        Be the First to upvote.

                

        



        
        
        
        
        

    

            

            1.9
            

            

             
                 Based on 33 vote(s)
                    

            
            
            
            
            
        

        
        

        

        

        

        

        

        


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.