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Sorting array except elements in a subarray
  • Difficulty Level : Medium
  • Last Updated : 06 Apr, 2021

Given an array A positive integers, sort the array in ascending order such that element in given subarray (start and end indexes are input) in unsorted array stay unmoved and all other elements are sorted.
Examples : 
 

Input : arr[] = {10, 4, 11, 7, 6, 20}
            l = 1, u = 3
Output : arr[] = {6, 4, 11, 7, 10, 20}
We sort elements except arr[1..3] which
is {11, 7, 6}. 

Input : arr[] = {5, 4, 3, 12, 14, 9};
            l = 1, u = 2;
Output : arr[] = {5, 4, 3, 9, 12, 14 }
We sort elements except arr[1..2] which
is {4, 3}. 

 

Approach : Copy all elements except the given limit of given array to another array. Then sort the other array using a sorting algorithm. Finally again copy the sorted array to original array. While copying, skip given subarray.
 

C++




// CPP program to sort all elements except
// given subarray.
#include <bits/stdc++.h>
using namespace std;
 
// Sort whole array a[] except elements in
// range a[l..r]
void sortExceptUandL(int a[], int l, int u, int n)
{
    // Copy all those element that need
    // to be sorted to an auxiliary
    // array b[]
    int b[n - (u - l + 1)];
    for (int i = 0; i < l; i++)
         b[i] = a[i];
    for (int i = u+1; i < n; i++)
         b[l + (i - (u+1))] = a[i];   
 
    // sort the array b
    sort(b, b + n - (u - l + 1));
 
    // Copy sorted elements back to a[]
    for (int i = 0; i < l; i++)
         a[i] = b[i];
    for (int i = u+1; i < n; i++)
         a[i] = b[l + (i - (u+1))];
}
 
// Driver code
int main()
{
    int a[] = { 5, 4, 3, 12, 14, 9 };
    int n = sizeof(a) / sizeof(a[0]);
    int l = 2, u = 4;
    sortExceptUandL(a, l, u, n);
    for (int i = 0; i < n; i++)
        cout << a[i] << " ";
}

Java




// Java program to sort all elements except
// given subarray.
import java.util.Arrays;
import java.io.*;
 
public class GFG {
     
    // Sort whole array a[] except elements in
    // range a[l..r]
    public static void sortExceptUandL(int a[],
                           int l, int u, int n)
    {
         
        // Copy all those element that need
        // to be sorted to an auxiliary
        // array b[]
        int b[] = new int[n - (u - l + 1)];
         
        for (int i = 0; i < l; i++)
            b[i] = a[i];
        for (int i = u+1; i < n; i++)
            b[l + (i - (u+1))] = a[i];
     
        // sort the array b
        Arrays.sort(b);
 
        // Copy sorted elements back to a[]
        for (int i = 0; i < l; i++)
            a[i] = b[i];
        for (int i = u+1; i < n; i++)
            a[i] = b[l + (i - (u+1))];
    }
    // Driver code
    public static void main(String args[])
    {
        int a[] = { 5, 4, 3, 12, 14, 9 };
        int n = a.length;
        int l = 2, u = 4;
         
        sortExceptUandL(a, l, u, n);
         
        for (int i = 0; i < n; i++)
            System.out.print(a[i] + " ");
    }
}
 
// This code is contributed by Manish Shaw
// (manishshaw1)

Python3




# Python3 program to sort all elements
# except given subarray.
 
# Sort whole array a[] except elements in
# range a[l..r]
def sortExceptUandL(a, l, u, n) :
     
    # Copy all those element that need
    # to be sorted to an auxiliary
    # array b[]
    b = [0] * (n - (u - l + 1))
     
    for i in range(0, l) :
        b[i] = a[i]
         
    for i in range(u+1, n) :
        b[l + (i - (u+1))] = a[i]
 
    # sort the array b
    b.sort()
 
    # Copy sorted elements back to a[]
    for i in range(0, l) :
        a[i] = b[i]
         
    for i in range(u+1, n) :
        a[i] = b[l + (i - (u+1))]
 
# Driver code
a = [ 5, 4, 3, 12, 14, 9 ]
n = len(a)
l = 2
u = 4
sortExceptUandL(a, l, u, n)
 
for i in range(0, n) :
    print ("{} ".format(a[i]), end="")
     
# This code is contributed by
# Manish Shaw (manishshaw1)

C#




// C# program to sort all elements except
// given subarray.
using System;
using System.Collections.Generic;
 
class GFG {
     
    // Sort whole array a[] except elements in
    // range a[l..r]
    static void sortExceptUandL(int []a, int l,
                                 int u, int n)
    {
         
        // Copy all those element that need
        // to be sorted to an auxiliary
        // array b[]
        int[] b = new int[n - (u-l+1)];
         
        for (int i = 0; i < l; i++)
            b[i] = a[i];
             
        for (int i = u+1; i < n; i++)
            b[l + (i - (u+1))] = a[i];
     
        // sort the array b
        Array.Sort<int>(b, 0, n - (u - l + 1));
     
        // Copy sorted elements back to a[]
        for (int i = 0; i < l; i++)
            a[i] = b[i];
             
        for (int i = u+1; i < n; i++)
            a[i] = b[l + (i - (u+1))];
    }
     
    // Driver code
    public static void Main()
    {
        int []a = { 5, 4, 3, 12, 14, 9 };
        int n = a.Length;
        int l = 2, u = 4;
         
        sortExceptUandL(a, l, u, n);
         
        for (int i = 0; i < n; i++)
            Console.Write(a[i] + " ");
    }
}
 
// This code is contributed by Manish Shaw
// (manishshaw1)

PHP




<?php
// PHP program to sort all
// elements except given subarray.
 
// Sort whole array a[] except
// elements in range a[l..r]
function sortExceptUandL($a, $l,
                         $u, $n)
{
    // Copy all those element
    // that need to be sorted 
    // to an auxiliary array b[]
    $b = array();
    for ($i = 0; $i < $l; $i++)
        $b[$i] = $a[$i];
    for ($i = $u + 1; $i < $n; $i++)
        $b[$l + ($i - ($u + 1))] = $a[$i];
 
    // sort the array b
    sort($b);
 
    // Copy sorted elements
    // back to a[]
    for ($i = 0; $i < $l; $i++)
        $a[$i] = $b[$i];
    for ($i = $u + 1; $i < $n; $i++)
        $a[$i] = $b[$l + ($i - ($u + 1))];
}
 
// Driver code
$a = array(4, 5, 3, 12, 14, 9);
$n = count($a);
$l = 2;
$u = 4;
sortExceptUandL($a, $l, $u, $n);
for ($i = 0; $i < $n; $i++)
    echo ($a[$i]. " ");
 
// This code is contributed by
// Manish Shaw(manishshaw1)
?>

Javascript




<script>
 
// JavaScript program to sort all elements except
// given subarray.
 
    // Sort whole array a[] except elements in
    // range a[l..r]
    function sortExceptUandL(a, l, u, n)
    {
           
        // Copy all those element that need
        // to be sorted to an auxiliary
        // array b[]
        let b = [];
           
        for (let i = 0; i < l; i++)
            b[i] = a[i];
        for (let i = u+1; i < n; i++)
            b[l + (i - (u + 1))] = a[i];
       
        // sort the array b
        b.sort();
   
        // Copy sorted elements back to a[]
        for (let i = 0; i < l; i++)
            a[i] = b[i];
        for (let i = u + 1; i < n; i++)
            a[i] = b[l + (i - (u + 1))];
    }
 
// Driver code
 
        let a = [ 5, 4, 3, 12, 14, 9 ];
        let n = a.length;
        let l = 2, u = 4;
           
        sortExceptUandL(a, l, u, n);
           
        for (let i = 0; i < n; i++)
            document.write(a[i] + " ");
                  
// This code is contributed by souravghosh0416.                
</script>
Output : 
4 5 3 12 14 9

 




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