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πŸ–₯Быстрая сортировка (QuickSort) с использованиСм рСкурсии

ΠŸΡ€ΠΎΠ±Π»Π΅ΠΌΠ°: cΠΎΡ€Ρ‚ΠΈΡ€ΠΎΠ²ΠΊΠ° Π±ΠΎΠ»ΡŒΡˆΠΈΡ… массивов ΠΌΠΎΠΆΠ΅Ρ‚ Π±Ρ‹Ρ‚ΡŒ нСэффСктивной ΠΏΡ€ΠΈ использовании простых Π°Π»Π³ΠΎΡ€ΠΈΡ‚ΠΌΠΎΠ², Ρ‚Π°ΠΊΠΈΡ… ΠΊΠ°ΠΊ сортировка ΠΏΡƒΠ·Ρ‹Ρ€ΡŒΠΊΠΎΠΌ ΠΈΠ»ΠΈ вставками.

РСшСниС: Автор Π² ΠΊΠ½ΠΈΠ³Π΅ Algorithms and Data Structures for OOP With C# дСмонстрируСт Ρ€Π΅Π°Π»ΠΈΠ·Π°Ρ†ΠΈΡŽ QuickSort β€” ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΈΠ· самых эффСктивных Π°Π»Π³ΠΎΡ€ΠΈΡ‚ΠΌΠΎΠ² сортировки Π½Π° ΠΏΡ€Π°ΠΊΡ‚ΠΈΠΊΠ΅, с рСкурсивным Ρ€Π°Π·Π±ΠΈΠ΅Π½ΠΈΠ΅ΠΌ массива.

ΠŸΡ€ΠΈΠΌΠ΅Ρ€ ΠΊΠΎΠ΄Π°:

public class QuickSortExample
{
public void QuickSort(int[] arr, int low, int high)
{
if (low < high)
{
int pi = Partition(arr, low, high);

QuickSort(arr, low, pi - 1);
QuickSort(arr, pi + 1, high);
}
}

private int Partition(int[] arr, int low, int high)
{
int pivot = arr[high];
int i = (low - 1);

for (int j = low; j < high; j++)
{
if (arr[j] < pivot)
{
i++;
(arr[i], arr[j]) = (arr[j], arr[i]);
}
}

(arr[i + 1], arr[high]) = (arr[high], arr[i + 1]);
return i + 1;
}
}


ΠŸΡ€Π΅ΠΈΠΌΡƒΡ‰Π΅ΡΡ‚Π²Π°:
β€” Быстрая сортировка Π΄Π°ΠΆΠ΅ Π±ΠΎΠ»ΡŒΡˆΠΈΡ… Π½Π°Π±ΠΎΡ€ΠΎΠ² Π΄Π°Π½Π½Ρ‹Ρ…
β€” БрСдняя ΡΠ»ΠΎΠΆΠ½ΠΎΡΡ‚ΡŒ O(n log n)
β€” Π­Ρ„Ρ„Π΅ΠΊΡ‚ΠΈΠ²Π½ΠΎΠ΅ использованиС памяти Π·Π° счСт рСкурсии
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πŸ–₯Быстрая сортировка (QuickSort) с использованиСм рСкурсии

ΠŸΡ€ΠΎΠ±Π»Π΅ΠΌΠ°: cΠΎΡ€Ρ‚ΠΈΡ€ΠΎΠ²ΠΊΠ° Π±ΠΎΠ»ΡŒΡˆΠΈΡ… массивов ΠΌΠΎΠΆΠ΅Ρ‚ Π±Ρ‹Ρ‚ΡŒ нСэффСктивной ΠΏΡ€ΠΈ использовании простых Π°Π»Π³ΠΎΡ€ΠΈΡ‚ΠΌΠΎΠ², Ρ‚Π°ΠΊΠΈΡ… ΠΊΠ°ΠΊ сортировка ΠΏΡƒΠ·Ρ‹Ρ€ΡŒΠΊΠΎΠΌ ΠΈΠ»ΠΈ вставками.

РСшСниС: Автор Π² ΠΊΠ½ΠΈΠ³Π΅ Algorithms and Data Structures for OOP With C# дСмонстрируСт Ρ€Π΅Π°Π»ΠΈΠ·Π°Ρ†ΠΈΡŽ QuickSort β€” ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΈΠ· самых эффСктивных Π°Π»Π³ΠΎΡ€ΠΈΡ‚ΠΌΠΎΠ² сортировки Π½Π° ΠΏΡ€Π°ΠΊΡ‚ΠΈΠΊΠ΅, с рСкурсивным Ρ€Π°Π·Π±ΠΈΠ΅Π½ΠΈΠ΅ΠΌ массива.

ΠŸΡ€ΠΈΠΌΠ΅Ρ€ ΠΊΠΎΠ΄Π°:


public class QuickSortExample
{
public void QuickSort(int[] arr, int low, int high)
{
if (low < high)
{
int pi = Partition(arr, low, high);

QuickSort(arr, low, pi - 1);
QuickSort(arr, pi + 1, high);
}
}

private int Partition(int[] arr, int low, int high)
{
int pivot = arr[high];
int i = (low - 1);

for (int j = low; j < high; j++)
{
if (arr[j] < pivot)
{
i++;
(arr[i], arr[j]) = (arr[j], arr[i]);
}
}

(arr[i + 1], arr[high]) = (arr[high], arr[i + 1]);
return i + 1;
}
}


ΠŸΡ€Π΅ΠΈΠΌΡƒΡ‰Π΅ΡΡ‚Π²Π°:
β€” Быстрая сортировка Π΄Π°ΠΆΠ΅ Π±ΠΎΠ»ΡŒΡˆΠΈΡ… Π½Π°Π±ΠΎΡ€ΠΎΠ² Π΄Π°Π½Π½Ρ‹Ρ…
β€” БрСдняя ΡΠ»ΠΎΠΆΠ½ΠΎΡΡ‚ΡŒ O(n log n)
β€” Π­Ρ„Ρ„Π΅ΠΊΡ‚ΠΈΠ²Π½ΠΎΠ΅ использованиС памяти Π·Π° счСт рСкурсии

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