Sort first half in ascending and second half in descending order | 1
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}
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 ?> |
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 ?> |
-1 1 2 3 8 6 5 4
Sort first half in ascending and second half in descending order | Set 2
This article is contributed by Ayush Saxena. 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 write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
Recommended Posts:
- Sort first half in ascending and second half in descending order | Set 2
- Sort first k values in ascending order and remaining n-k values in descending order
- Sort all even numbers in ascending order and then sort all odd numbers in descending order
- Sorting rows of matrix in descending order followed by columns in ascending order
- Sorting rows of matrix in ascending order followed by columns in descending order
- Find prime numbers in the first half and second half of an array
- Find the sum of the first half and second half elements of an array
- Sort a linked list that is sorted alternating ascending and descending orders?
- Stable sort for descending order
- Program to sort string in descending order
- Python | Sort words of sentence in ascending order
- Sort an array of string of dates in ascending order
- Sorting Vector of Pairs in C++ | Set 2 (Sort in descending order by first and second)
- Sort prime numbers of an array in descending order
- Number of subarrays such that XOR of one half is equal to the other