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quick sort

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Defiant Donkey answered on February 4, 2022 Popularity 10/10 Helpfulness 1/10

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def partition(start, end, array):
     
    # Initializing pivot's index to start
    pivot_index = start
    pivot = array[pivot_index]
     
    # This loop runs till start pointer crosses
    # end pointer, and when it does we swap the
    # pivot with element on end pointer
    while start < end:
         
        # Increment the start pointer till it finds an
        # element greater than  pivot
        while start < len(array) and array[start] <= pivot:
            start += 1
             
        # Decrement the end pointer till it finds an
        # element less than pivot
        while array[end] > pivot:
            end -= 1
         
        # If start and end have not crossed each other,
        # swap the numbers on start and end
        if(start < end):
            array[start], array[end] = array[end], array[start]
     
    # Swap pivot element with element on end pointer.
    # This puts pivot on its correct sorted place.
    array[end], array[pivot_index] = array[pivot_index], array[end]
    
    # Returning end pointer to divide the array into 2
    return end
     
# The main function that implements QuickSort
def quick_sort(start, end, array):
     
    if (start < end):
         
        # p is partitioning index, array[p]
        # is at right place
        p = partition(start, end, array)
         
        # Sort elements before partition
        # and after partition
        quick_sort(start, p - 1, array)
        quick_sort(p + 1, end, array)

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Contributed on Feb 17 2022

Defiant Donkey

0 Answers Avg Quality 2/10

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çeviri

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Come to tureng, brother.

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Contributed on May 12 2022

Burak ÖVEÇ

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Contributed on Feb 01 2023

Misty Mouse

0 Answers Avg Quality 2/10

quick sort

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function swap(arr, leftIndex, rightIndex){
  // swap 2 elements in the array
    var temp = arr[leftIndex];
    arr[leftIndex] = arr[rightIndex];
    arr[rightIndex] = temp;
}
function partition(arr, left, right) {
    var pivot   = arr[Math.floor((right + left) / 2)], //middle element
        i       = left, //left pointer
        j       = right; //right pointer
    while (i <= j) { // while left pointer is smaller than right pointer
        while (arr[i] < pivot) { // move the left pointer to the right
            i++;
        }
        while (arr[j] > pivot) { // move the right pointer to the left
            j--;
        }
        if (i <= j) { //left pointer smaller or equal to right pointer
            swap(arr, i, j); //sawpping two elements
            i++;
            j--;
        }
    }
    return i;
}
// run as quickSort(array, 0, array.length - 1);
function quickSort(arr, left, right) {
    var index;
    if (arr.length > 1) {
        index = partition(arr, left, right); //index returned from partition
        if (left < index - 1) { //more elements on the left side of the pivot
            quickSort(arr, left, index - 1);
        }
        if (index < right) { //more elements on the right side of the pivot
            quickSort(arr, index, right);
        }
    }
    return arr;
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: sorting-algorithms.me

Tags: javascript j

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Contributed on Sep 13 2022

katanton reckless

0 Answers Avg Quality 2/10

quick sort

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#https://github.com/paulnegz/sorts-py/blob/main/sort.py
def quick_sort(array :list)->list:
    def _quick_sort(array :list)->list:
        if len(array)<=1: return array
        
        pivot, is_bigger = array.pop(), lambda x: x>pivot
        left_partition = _quick_sort([x for x in array if not is_bigger(x)])
        right_partition = _quick_sort([x for x in array if is_bigger(x)])
        return [*left_partition, pivot, *right_partition]
    return _quick_sort(array)
  
arr = [7, 2, 4, 0, 1, 5, 8, 3, 2, 0]
print(quick_sort(arr)) # [0, 0, 1, 2, 2, 3, 4, 5, 7, 8]

Popularity 10/10 Helpfulness 2/10 Language python

Source: github.com

Tags: whatever whateve

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Contributed on Jun 25 2023

Paul Negedu

0 Answers Avg Quality 2/10

quick sort

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  static void swap(int[] arr, int i, int j) {
    int temp = arr[i];
    arr[i] = arr[j];
    arr[j] = temp;
  }  
  
  static int partition(int[] arr, int low, int high) { 
    
    int pivot = arr[high]; 
    // Index of smaller element and
    // indicates the right position
    // of pivot found so far
    int i = (low - 1); 
  
    for(int j = low; j <= high - 1; j++) {
      // If current element is smaller 
      // than the pivot
      if (arr[j] < pivot) {
        // Increment index of 
        // smaller element
        i++; 
        swap(arr, i, j);
      }
    }
    swap(arr, i + 1, high);
    return (i + 1);
  }
  
  static void quickSort(int[] arr, int low, int high) {
      if (low < high) {
          // pi is partitioning index, arr[p]
          // is now at right place 
          int pi = partition(arr, low, high);

          // Separately sort elements before
          // partition and after partition
          quickSort(arr, low, pi - 1);
          quickSort(arr, pi + 1, high);
      }
  }

Popularity 10/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: function functio

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Contributed on Sep 14 2022

Inexpensive Ibex

0 Answers Avg Quality 2/10

quicksort

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# Python3 implementation of QuickSort  
  
  
# Function to find the partition position
def partition(array, low, high):
  
  # Choose the rightmost element as pivot
  pivot = array[high]
  
  # Pointer for greater element
  i = low - 1
  
  # Traverse through all elements
  # compare each element with pivot
  for j in range(low, high):
    if array[j] <= pivot:
      # If element smaller than pivot is found
      # swap it with the greater element pointed by i
      i = i + 1
  
      # Swapping element at i with element at j
      (array[i], array[j]) = (array[j], array[i])
  
  # Swap the pivot element with the greater element specified by i
  (array[i + 1], array[high]) = (array[high], array[i + 1])
  
  # Return the position from where partition is done
  return i + 1
  
# Function to perform quicksort
def quick_sort(array, low, high):
  if low < high:
  
    # Find pivot element such that
    # element smaller than pivot are on the left
    # element greater than pivot are on the right
    pi = partition(array, low, high)
  
    # Recursive call on the left of pivot
    quick_sort(array, low, pi - 1)
  
    # Recursive call on the right of pivot
    quick_sort(array, pi + 1, high)
  
    
          
# Driver code
array = [ 10, 7, 8, 9, 1, 5]
quick_sort(array, 0, len(array) - 1)
  
print(f'Sorted array: {array}')
      
# This code is contributed by Adnan Aliakbar

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Source: www.geeksforgeeks.org

Tags: quicksort quic

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Contributed on Aug 04 2022

Lazy Locust

0 Answers Avg Quality 2/10

quick sort

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def quicksort(arr):
    if len(arr) <= 1:
        return arr
    pivot = arr[len(arr) // 2]
    left = [x for x in arr if x < pivot]
    middle = [x for x in arr if x == pivot]
    right = [x for x in arr if x > pivot]
    return quicksort(left) + middle + quicksort(right)

print(quicksort([3,6,8,10,1,2,1]))
# Prints "[1, 1, 2, 3, 6, 8, 10]"

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Contributed on Feb 04 2022

Purple Team

0 Answers Avg Quality 2/10

Quick sort

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// Take Left (first) Index of the array and Right (last) Index of the array
void quickSort(int Data[], int l , int r)
{
	// If the first index less or equal than the last index
	if (l <= r)
	{
		// Create a Key/Pivot Element
		int key = Data[(l+r)/2];

		// Create temp Variables to loop through array
		int i = l;
		int j = r;

		while (i <= j)
		{
			while (Data[i] < key)
				i++;
			while (Data[j] > key)
				j--;

			if (i <= j)
			{
				swap(Data[i], Data[j]);
				i++;
				j--;
			}
		}

		// Recursion to the smaller partition in the array after sorted above

		if (l < j)
			quickSort(Data, l, j);
		if (r > i)
			quickSort(Data, i, r);
	}
}

Popularity 9/10 Helpfulness 1/10 Language cpp

Source: www.stdio.vn

Tags: c++

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Contributed on Jun 24 2022

Tiien

0 Answers Avg Quality 2/10

quick_sort

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void quick_sort(int q[], int l, int r)
{
    if (l >= r) return;

    int i = l - 1, j = r + 1, x = q[l + r >> 1];
    while (i < j)
    {
        do i ++ ; while (q[i] < x);
        do j -- ; while (q[j] > x);
        if (i < j) swap(q[i], q[j]);
    }
    quick_sort(q, l, j), quick_sort(q, j + 1, r);
}

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Source: www.acwing.com

Tags: c++

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Contributed on Apr 08 2022

Uptight Unicorn

0 Answers Avg Quality 2/10

quick sort

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