C++ code for quicksort

Quick sort c++

#include <iostream>
using namespace std;
// Swap two elements - Utility function  
void swap(int* a, int* b) 
{ 
    int t = *a; 
    *a = *b; 
    *b = t; 
} 
   
// partition the array using last element as pivot
int partition (int arr[], int low, int high) 
{ 
    int pivot = arr[high];    // pivot 
    int i = (low - 1);   
   
    for (int j = low; j <= high- 1; j++) 
    { 
        //if current element is smaller than pivot, increment the low element
        //swap elements at i and j
        if (arr[j] <= pivot) 
        { 
            i++;    // increment index of smaller element 
            swap(&arr[i], &arr[j]); 
        } 
    } 
    swap(&arr[i + 1], &arr[high]); 
    return (i + 1); 
} 
   
//quicksort algorithm
void quickSort(int arr[], int low, int high) 
{ 
    if (low < high) 
    { 
        //partition the array 
        int pivot = partition(arr, low, high); 
   
        //sort the sub arrays independently 
        quickSort(arr, low, pivot - 1); 
        quickSort(arr, pivot + 1, high); 
    } 
} 
   
void displayArray(int arr[], int size) 
{ 
    int i; 
    for (i=0; i < size; i++) 
        cout<<arr[i]<<"\t"; 
      
} 
   
int main() 
{ 
    int arr[] = {12,23,3,43,51,35,19,45}; 
    int n = sizeof(arr)/sizeof(arr[0]); 
    cout<<"Input array"<<endl;
    displayArray(arr,n);
    cout<<endl;
    quickSort(arr, 0, n-1); 
    cout<<"Array sorted with quick sort"<<endl; 
    displayArray(arr,n); 
    return 0; 
}

C++ code for quicksort

#include<bits/stdc++.h>
using namespace std;
int partition(int a[],int low,int high)
{
    int pivot =a[high],i=low-1,j=low;
    for(j=low;j<=high-1;j++)
    {
        if(a[high]>=a[j])
        {
            i++;
            swap(a[i],a[j]);
        }
    }
    swap(a[i+1],a[high]);
    return i+1;
    
}
void quicksort(int a[],int low,int high)
{
    if(low<high)
    {
        int  t = partition(a,low,high);
        quicksort(a,low,t-1);
        quicksort(a,t+1,high);
    }
}
int main()
{
    //quick sort
    int a[8] = {3,10,8,51,92,6,2,1};
    quicksort(a,0,7);
    for(int i=0;i<8;i++)
    {
        cout<<a[i]<<" ";
    }
    
    return 0;
}

Similar codes

18 votes293 views2 answers
Stl for sorting IN C++
C++
0 vote306 views1 answer
C function as paramter
C++
21 votes297 views6 answers
Cin c++
C++
0 vote296 views1 answer
Ifstream file (“code2.txt”); dev C++
C++
11 votes323 views2 answers
Enter a key and display it's ascii value in c++
C++
0 vote342 views1 answer
C++ x y in arrau 1d
C++
0 vote309 views1 answer
16630147
C++
0 vote321 views1 answer
Public method
C++
0 vote308 views2 answers
C++ char it is a number
C++
1 vote295 views1 answer
Cpp float to string
C++