Sort first half in ascending and second half in descending order

Given an array of integers, sort the first half of the array in ascending order and second half in descending order.

Examples:

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

Input : arr[] = {1, 2, 3, 4, 5, 6}
Output : arr[] = {1, 2, 3, 6, 5, 4}

Recommended: Please solve it on “PRACTICE ” first, before moving on to the solution.

Algorithm :
1. Sort the given array.
2. Run a loop upto half the length of the array and print the elements of the sorted array.
3. Run a loop from last index of the array to the middle of the array and print the elements in reverse order.

Below is the implementation for the same.

C++

// C++ program to print first half in  
// ascending order and the second half 
// in descending order 
#include <bits/stdc++.h> 
using namespace std; 
  
// function to print half of the array in  
// ascending order and the other half in  
// descending order 
void printOrder(int arr[], int n) 
{ 
    // sorting the array 
    sort(arr, arr + n); 
  
    // printing first half in ascending  
    // order 
    for (int i = 0; i < n / 2; i++)  
        cout << arr[i] << " ";     
  
    // printing second half in descending  
    // order 
    for (int j = n - 1; j >= n / 2; j--)  
        cout << arr[j] << " ";      
} 
  
// driver code 
int main() 
{ 
    int arr[] = { 5, 4, 6, 2, 1, 3, 8, 9, 7 }; 
    int n = sizeof(arr) / sizeof(arr[0]); 
    printOrder(arr, n); 
  
    return 0; 
} 

Java

// Java program to print first half in  
// ascending order and the second half 
// in descending order 
import java.util.*; 
  
class GFG 
{ 
// function to print half of the array in  
// ascending order and the other half in  
// descending order 
static void printOrder(int[] arr, int n) 
{ 
    // sorting the array 
    Arrays.sort(arr); 
  
    // printing first half in ascending  
    // order 
    for (int i = 0; i < n / 2; i++)  
        System.out.print(arr[i]+" "); 
  
    // printing second half in descending  
    // order 
    for (int j = n - 1; j >= n / 2; j--) 
    System.out.print(arr[j]+" "); 
      
} 
  
// Driver code 
public static void main(String[] args) 
{ 
    int[] arr = { 5, 4, 6, 2, 1, 3, 8, 9, 7 }; 
    int n = arr.length; 
    printOrder(arr, n); 
  
} 
} 
/* This code is contributed by Mr. Somesh Awasthi */

Python

# Python program to print first half in  
# ascending order and the second half 
# in descending order 
  
  
# function to print half of the array in  
# ascending order and the other half in  
# descending order 
def printOrder(arr,n) : 
      
    # sorting the array 
    arr.sort() 
   
    # printing first half in ascending  
    # order 
    i = 0
    while (i< n/ 2 ) : 
        print arr[i], 
        i = i + 1
          
    # printing second half in descending  
    # order 
    j = n - 1
    while j >= n / 2 : 
        print arr[j], 
        j = j - 1
          
# Driver code 
arr = [5, 4, 6, 2, 1, 3, 8, 9, 7] 
n = len(arr) 
printOrder(arr, n) 
  
# This code is contributed by Nikita Tiwari. 

C#

// C# program to print first half in  
// ascending order and the second half 
// in descending order 
using System; 
  
class GFG { 
      
    // function to print half of the array in  
    // ascending order and the other half in  
    // descending order 
    static void printOrder(int[] arr, int n) 
    { 
          
        // sorting the array 
        Array.Sort(arr); 
      
        // printing first half in ascending  
        // order 
        for (int i = 0; i < n / 2; i++)  
            Console.Write(arr[i] + " "); 
      
        // printing second half in descending  
        // order 
        for (int j = n - 1; j >= n / 2; j--) 
            Console.Write(arr[j] + " "); 
    } 
      
    // Driver code 
    public static void Main() 
    { 
        int[] arr = { 5, 4, 6, 2, 1, 3, 8, 9, 7 }; 
        int n = arr.Length; 
          
        printOrder(arr, n); 
    } 
} 
  
// This code is contributed by vt_m. 

PHP

<?php 
// PHP program to print first half in  
// ascending order and the second half 
// in descending order 
  
// function to print half of the array in  
// ascending order and the other half in  
// descending order 
function printOrder($arr, $n) 
{ 
      
    // sorting the array 
    sort($arr); 
  
    // printing first half  
    // in ascending order 
    for ($i = 0; $i < intval($n / 2); $i++)  
        echo $arr[$i] . " ";  
  
    // printing second half 
    // in descending order 
    for ($j = $n - 1; $j >= intval($n / 2); $j--)  
        echo $arr[$j] . " ";      
} 
  
    // Driver Code 
    $arr = array(5, 4, 6, 2, 1, 
                    3, 8, 9, 7); 
    $n = count($arr); 
    printOrder($arr, $n); 
  
// This code is contributed by Sam007 
?> 

Output:

1 2 3 4 9 8 7 6 5

Alternate Solution :
Here, The elements in the 1st half of array will remain in 1st half but in ascending order among the elements in the 1st half and those in 2nd half of array will remain in 2nd half but in descending order among the elements in the 2nd half.

1. Sort the 1st half of the array in ascending order just because only the elements in the 1st half of the input array needs to be sorted in ascending order (In this way the original elements in the 1st half of the array will remain in the 1st half but in ascending order).

2. Sort the 2nd half of the array in descending order just because only the elements in the 2nd half of the input array needs to be sorted in descending order (In this way the original elements in the 2nd half of the array will remain in the 1st half but in descending order).

C++

// C++ program to print first half in  
// ascending order and the second half 
// in descending order 
#include <bits/stdc++.h> 
using namespace std; 
  
// function to print half of the array in  
// ascending order and the other half in  
// descending order 
void printOrder(int arr[], int n) 
{ 
    // sorting the array 
    sort(arr, arr + n); 
  
    // printing first half in ascending  
    // order 
    for (int i = 0; i < n / 2; i++)  
        cout << arr[i] << " ";  
  
    // printing second half in descending  
    // order 
    for (int j = n - 1; j >= n / 2; j--)  
        cout << arr[j] << " ";      
} 
  
// driver code 
int main() 
{ 
    int arr[] = { 5, 4, 6, 2, 1, 3, 8, -1 }; 
    int n = sizeof(arr) / sizeof(arr[0]); 
    printOrder(arr, n); 
  
    return 0; 
} 

Java

// Java program to print first half in  
// ascending order and the second half  
// in descending order  
import java.util.*; 
  
class GFG  
{ 
  
    // function to print half of the array in  
    // ascending order and the other half in  
    // descending order  
    static void printOrder(int[] arr, int n) 
    { 
        // sorting the array  
        Arrays.sort(arr); 
  
        // printing first half in ascending  
        // order  
        for (int i = 0; i < n / 2; i++)  
        { 
            System.out.print(arr[i] + " "); 
        } 
  
        // printing second half in descending  
        // order  
        for (int j = n - 1; j >= n / 2; j--) 
        { 
            System.out.print(arr[j] + " "); 
        } 
    } 
  
    // Driver code  
    public static void main(String[] args)  
    { 
        int[] arr = {5, 4, 6, 2, 1, 3, 8, -1}; 
        int n = arr.length; 
        printOrder(arr, n); 
    } 
}  
  
// This code has been contributed by 29AjayKumar 

Python 3

# Python 3 program to print first half  
# in ascending order and the second half 
# in descending order 
  
# function to print half of the array in  
# ascending order and the other half in  
# descending order 
def printOrder(arr, n): 
  
    # sorting the array 
    arr.sort() 
  
    # printing first half in ascending  
    # order 
    for i in range(n // 2):  
        print(arr[i], end = " ")  
  
    # printing second half in descending  
    # order 
    for j in range(n - 1, n // 2 -1, -1) : 
        print(arr[j], end = " ") 
  
# Driver code 
if __name__ == "__main__": 
      
    arr = [ 5, 4, 6, 2, 1, 3, 8, -1 ] 
    n = len(arr) 
    printOrder(arr, n) 
  
# This code is contributed by ita_c 

C#

// C# program to print first half in  
// ascending order and the second half 
// in descending order 
using System; 
  
class GFG 
{ 
      
// function to print half of the array in  
// ascending order and the other half in  
// descending order 
static void printOrder(int[] arr, int n) 
{ 
    // sorting the array 
    Array.Sort(arr); 
  
    // printing first half in ascending  
    // order 
    for (int i = 0; i < n / 2; i++)  
        Console.Write(arr[i] + " ");  
  
    // printing second half in descending  
    // order 
    for (int j = n - 1; j >= n / 2; j--)  
        Console.Write(arr[j] + " ");      
} 
  
// Driver code 
public static void Main() 
{ 
    int[] arr = {5, 4, 6, 2, 1, 3, 8, -1}; 
    int n = arr.Length; 
    printOrder(arr, n); 
} 
} 
  
// This code is contributed  
// by Akanksha Rai 

PHP

<?php 
// PHP program to print first half in  
// ascending order and the second half 
// in descending order 
  
// function to print half of the array in  
// ascending order and the other half in  
// descending order 
function printOrder($arr, $n) 
{ 
    // sorting the array 
    sort($arr); 
  
    // printing first half in ascending  
    // order 
    for ($i = 0; $i < $n / 2; $i++)  
        echo $arr[$i] . " ";  
  
    // printing second half in descending  
    // order 
    for ($j = $n - 1; $j >= $n / 2; $j--)  
        echo $arr[$j] . " ";      
} 
  
// Driver code 
$arr = array(5, 4, 6, 2, 1, 3, 8, -1); 
$n = sizeof($arr); 
printOrder($arr, $n); 
  
// This code is contributed  
// by Akanksha Rai 
?> 

Output:

-1 1 2 3 8 6 5 4

Sort first half in ascending and second half in descending order | Set 2

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My Personal Notes

Sort first half in ascending and second half in descending order | 1

Recommended: Please solve it on “PRACTICE ” first, before moving on to the solution.

C++

Java

Python

C#

PHP

C++

Java

Python 3

C#

PHP

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