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Ben
2021-11-19 16:14:51 +00:00
parent 25f2975974
commit d740b582d7
4 changed files with 271 additions and 84 deletions
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31
Linear Data Structures and Linked Lists/Linear Data Structures and Linked Lists.sln Normal file
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Linear Data Structures and Linked Lists/Linear Data Structures and Linked Lists.vcxproj Normal file
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6
Linear Data Structures and Linked Lists/main.cpp Normal file
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#include <iostream>
int main()
{
std::cout << "Hello, world!" << std::endl;
}

171
Quicksort and Mergesort/Quicksort and Mergesort.cpp
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#include <iostream> #include <iostream>
void PrintArr(int* arr, int size) void PrintArr(int* arr, int size)
{ {
for (int i = 0; i < size; i++) for (int i = 0; i < size; i++)
{ {
std::cout << arr[i] << " "; std::cout << arr[i] << " ";
} }
std::cout << std::endl; std::cout << std::endl;
} }
void ShuffleArr(int* arr, int size) void ShuffleArr(int* arr, int size)
{ {
size_t i; size_t i;
for (i = 0; i < size - 1; i++) for (i = 0; i < size - 1; i++)
{ {
size_t j = i + rand() / (RAND_MAX / (size - i) + 1); size_t j = i + rand() / (RAND_MAX / (size - i) + 1);
int t = arr[j]; int t = arr[j];
arr[j] = arr[i]; arr[j] = arr[i];
arr[i] = t; arr[i] = t;
} }
} }
void Swap(int* a, int* b) void Swap(int* a, int* b)
{ {
int t = *a; int t = *a;
*a = *b; *a = *b;
*b = t; *b = t;
} }
void CopyArr(int* source, int* target, int start, int end) void CopyArr(int* source, int* target, int start, int end)
{ {
for (int i = start; i < end; i++) for (int i = start; i < end; i++)
{ {
target[i] = source[i]; target[i] = source[i];
} }
} }
void Merge(int* arr, int start, int mid, int end) void Merge(int* arr, int start, int mid, int end)
{ {
std::cout << start << " " << mid << " " << end << std::endl; std::cout << start << " " << mid << " " << end << std::endl;
int* leftHalf = new int[mid - start + 1]; int* leftHalf = new int[mid - start + 1];
int* rightHalf = new int[end - mid]; int* rightHalf = new int[end - mid];
CopyArr(arr, leftHalf, 0, mid); CopyArr(arr, leftHalf, 0, mid);
CopyArr(arr, rightHalf, mid + 1, end); CopyArr(arr, rightHalf, mid + 1, end);
// merge together // merge together
int leftIndex = 0; int leftIndex = 0;
int rightIndex = 0; int rightIndex = 0;
for (int i = 0; i < end - start; i++) for (int i = 0; i < end - start; i++)
{ {
} }
delete[] leftHalf;
} delete[] rightHalf;
}
void MergeSort(int* arr, int start, int end)
{ void MergeSort(int* arr, int start, int end)
int mid = start + (start + end) / 2; {
if (start >= end) int mid = (end - start) + (end / 2);
MergeSort(arr, start, mid); if (start < end)
MergeSort(arr, mid + 1, end); {
Merge(arr, start, mid, end); MergeSort(arr, start, mid);
} MergeSort(arr, mid + 1, end);
}
Merge(arr, start, mid, end);
int main() }
{
int* arr = new int[100];
for (int i = 0; i < 100; i++) int main()
arr[i] = i; {
int* arr = new int[100];
// MergeSort for (int i = 0; i < 100; i++)
std::cout << "Merge Sort" << std::endl; arr[i] = i;
ShuffleArr(arr, 100);
MergeSort(arr, 0, 100); // MergeSort
PrintArr(arr, 100); std::cout << "Merge Sort" << std::endl;
ShuffleArr(arr, 100);
// QuickSort MergeSort(arr, 0, 100);
ShuffleArr(arr, 100); PrintArr(arr, 100);
} // QuickSort
ShuffleArr(arr, 100);
}