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Author SHA1 Message Date
Ben
d740b582d7 lol 2021-11-19 16:14:51 +00:00
Ben
25f2975974 Mergesort and Quicksort 2021-11-03 14:27:58 +00:00
Ben
e030661e2c Searching and Sorting 2021-10-29 16:50:09 +01:00
Benjamin Kyd
e5947097bc Merge pull request #1 from benkyd/add-license-1 
Create LICENSE
 2021-10-26 14:57:11 +01:00
9 changed files with 771 additions and 0 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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Linear Data Structures and Linked Lists/main.cpp Normal file
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#include <iostream>
int main()
{
std::cout << "Hello, world!" << std::endl;
}

87
Quicksort and Mergesort/Quicksort and Mergesort.cpp Normal file
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#include <iostream>
void PrintArr(int* arr, int size)
{
for (int i = 0; i < size; i++)
{
std::cout << arr[i] << " ";
}
std::cout << std::endl;
}
void ShuffleArr(int* arr, int size)
{
size_t i;
for (i = 0; i < size - 1; i++)
{
size_t j = i + rand() / (RAND_MAX / (size - i) + 1);
int t = arr[j];
arr[j] = arr[i];
arr[i] = t;
}
}
void Swap(int* a, int* b)
{
int t = *a;
*a = *b;
*b = t;
}
void CopyArr(int* source, int* target, int start, int end)
{
for (int i = start; i < end; i++)
{
target[i] = source[i];
}
}
void Merge(int* arr, int start, int mid, int end)
{
std::cout << start << " " << mid << " " << end << std::endl;
int* leftHalf = new int[mid - start + 1];
int* rightHalf = new int[end - mid];
CopyArr(arr, leftHalf, 0, mid);
CopyArr(arr, rightHalf, mid + 1, end);
// merge together
int leftIndex = 0;
int rightIndex = 0;
for (int i = 0; i < end - start; i++)
{
}
delete[] leftHalf;
delete[] rightHalf;
}
void MergeSort(int* arr, int start, int end)
{
int mid = (end - start) + (end / 2);
if (start < 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++)
arr[i] = i;
// MergeSort
std::cout << "Merge Sort" << std::endl;
ShuffleArr(arr, 100);
MergeSort(arr, 0, 100);
PrintArr(arr, 100);
// QuickSort
ShuffleArr(arr, 100);
}

31
Quicksort and Mergesort/Quicksort and Mergesort.sln Normal file
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144
Searching and Sorting/Searching and Sorting.cpp Normal file
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#include <iostream>
#include <vector>
template <typename T>
void PrintVector(std::vector<T> v)
{
for (const auto& e : v)
std::cout << e << ", ";
std::cout << std::endl;
}
void Swap(int* a, int* b)
{
int temp = *b;
*b = *a;
*a = temp;
}
std::vector<int> SelectionSort(std::vector<int> in)
{
for (int i = 0; i < in.size(); i++)
{
int indexOfSmallest = i;
for (int j = i; j < in.size(); j++)
{
if (in[indexOfSmallest] > in[j])
{
indexOfSmallest = j;
}
}
if (indexOfSmallest != i)
{
Swap(&in[i], &in[indexOfSmallest]);
}
}
return in;
}
std::vector<int> InsersionSort(std::vector<int> in)
{
for (int i = 0; i < in.size(); i++)
{
int itemToInsert = in[i];
int indexHole = i;
while (indexHole > 0 && in[indexHole - 1] > itemToInsert)
{
in[indexHole] = in[indexHole - 1];
indexHole--;
}
in[indexHole] = itemToInsert;
}
return in;
}
std::vector<int> BubbleSort(std::vector<int> in)
{
for (int i = 0; i < in.size(); i++)
{
for (int j = 0; j < in.size() - 1; j++)
{
if (in[j] > in[j + 1])
{
Swap(&in[j], &in[j + 1]);
}
}
}
return in;
}
int LinearSearch(std::vector<int> vals, int lookup)
{
for (const auto& i : vals)
{
if (i == lookup)
{
return lookup;
}
}
}
std::vector<int> SubsetVector(std::vector<int> in, int start, int end)
{
std::vector<int> result(start - end + 1);
std::copy(in.begin() + start, in.begin() + end + 1, result.begin());
return result;
}
int BinarySearch(std::vector<int> set, int lookup)
{
if (set[set.size() / 2] == lookup) return lookup;
if (set[set.size() / 2] > lookup) return BinarySearch(SubsetVector(set, set.size() / 2, set.size()), lookup);
if (set[set.size() / 2] < lookup) return BinarySearch(SubsetVector(set, 0, set.size() / 2), lookup);
}
int TernarySearch(std::vector<int> set, int lookup)
{
if (set.size() == 1) return set[0];
if (set.size() == 2) return BinarySearch(set, lookup);
int firstThird = 0;
int secondThird = set.size() / 3;
int thirdThird = (set.size() / 3) * 2;
int lastThird = set.size();
if (set[firstThird] > lookup && set[secondThird] < lookup) return TernarySearch(SubsetVector(set, firstThird, secondThird), lookup);
if (set[secondThird] > lookup && set[thirdThird] < lookup) return TernarySearch(SubsetVector(set, secondThird, thirdThird), lookup);
if (set[thirdThird] > lookup && set[lastThird] < lookup) return TernarySearch(SubsetVector(set, thirdThird, lastThird), lookup);
}
int main()
{
std::vector<int> sorted;
sorted = SelectionSort({ 1, 4, 3, 5, 7, 4, 3, 7, 8, 2, 10, 5, 100 });
PrintVector(sorted);
sorted = InsersionSort({ 1, 4, 3, 5, 7, 4, 3, 7, 8, 2, 10, 5, 100 });
PrintVector(sorted);
sorted = BubbleSort({ 1, 4, 3, 5, 7, 4, 3, 7, 8, 2, 10, 5, 100 });
PrintVector(sorted);
std::cout << std::endl;
int lookup = 0;
lookup = LinearSearch(BubbleSort({ 1, 4, 3, 5, 7, 4, 3, 7, 8, 2, 10, 5, 100 }), 5);
std::cout << lookup << std::endl;
lookup = BinarySearch(BubbleSort({ 1, 4, 3, 5, 7, 4, 3, 7, 8, 2, 10, 5, 100 }), 5);
std::cout << lookup << std::endl;
lookup = TernarySearch(BubbleSort({ 1, 4, 3, 5, 7, 4, 3, 7, 8, 2, 10, 5, 100 }), 5);
std::cout << lookup << std::endl;
}

31
Searching and Sorting/Searching and Sorting.sln Normal file
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