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Data Structures Exam/81248_GLL/01_lists.cpp

@@ -0,0 +1,130 @@
+#include <unordered_map>
+
+using std::unordered_map;
+
+struct Node
+{
+	int data;
+	Node* next;
+
+	Node() : next(nullptr) {}
+	Node(int data) : data(data), next(nullptr) {}
+	Node(int data, Node* sNext) : data(data), next(sNext) {}
+};
+
+void pushBack(Node* first, int elemToAdd)
+{
+	while(first->next != nullptr)
+	{
+		first = first->next;
+	}
+	first->next = new Node(elemToAdd);
+}
+
+void copyList(const Node* from, Node* to)
+{
+	to = new Node(from->data);
+	while(from->next != nullptr)
+	{
+		pushBack(to, from->data);
+		from = from->next;
+	}
+	pushBack(to, from->data);
+}
+
+void initialiseIntBoolMapFromList(const Node* first, unordered_map<int, bool> &map)
+{
+	while(first->next != nullptr)
+	{
+		map[first->data] = false;
+		first = first->next;
+	}
+	map[first->data] = false;
+}
+
+Node* listUnion(const Node* first, const Node* second)
+{
+	Node* newList = new Node(first->data); //hack
+	unordered_map<int, bool> unionElems;
+
+	if(first == nullptr && second == nullptr)
+	{
+		return newList;
+	}
+	if(first == nullptr)
+	{
+		copyList(second, newList);
+		return newList;
+	}
+	else if (second == nullptr)
+	{
+		copyList(second, newList);
+		return newList;
+	}
+	initialiseIntBoolMapFromList(first, unionElems);
+	initialiseIntBoolMapFromList(second, unionElems);
+	unionElems[first->data] = true; // hack
+
+	while(first != nullptr)
+	{
+		if(!unionElems[first->data])
+		{
+			unionElems[first->data] = true;
+			pushBack(newList, first->data);
+		}
+		first = first->next;
+	}
+	while(second != nullptr)
+	{
+		if(!unionElems[second->data])
+		{
+			unionElems[second->data] = true;
+			pushBack(newList, second->data);
+		}
+		second = second->next;
+	}
+	return newList;
+}
+
+Node* listIntersection(const Node* first, const Node* second)
+{
+	Node* newList = nullptr; //hack
+	unordered_map<int, bool> intersectionElems;
+
+	if(first == nullptr || second == nullptr)
+	{
+		return newList;
+	}
+
+	initialiseIntBoolMapFromList(first, intersectionElems);
+	initialiseIntBoolMapFromList(second, intersectionElems);
+
+	while(first != nullptr)
+	{
+		if(!intersectionElems[first->data])
+		{
+			intersectionElems[first->data] = true;
+		}
+		first = first->next;
+	}
+	while(second != nullptr)
+	{
+		if(intersectionElems[second->data])
+		{
+			if(newList == nullptr) //stupid hack, sorry
+			{
+				newList = new Node(second->data);
+			}
+			else
+			{
+				pushBack(newList, second->data);
+			}
+		}
+		second = second->next;
+	}
+	if(newList == nullptr)
+	{
+		newList = new Node(); //stupid hack
+	}
+	return newList;
+}

Data Structures Exam/81248_GLL/02_tree.cpp

@@ -0,0 +1,58 @@
+
+struct Node
+{
+	int data;
+	Node* left;
+	Node* right;
+	Node(const int& sData) : data(sData), left(nullptr), right(nullptr) {}
+	Node(const int& sData, Node* sLeft, Node* sRight) : data(sData), left(sLeft), right(sRight) {}
+};
+
+bool hasLeft(const Node* root)
+{
+	return (root->left != nullptr);
+}
+
+bool hasRight(const Node* root)
+{
+	return (root->right != nullptr);
+}
+
+void insertInTree(Node* &root, const int& elem)
+{
+	if(root == nullptr)
+	{
+		root = new Node(elem);
+	}
+	if(elem <= root->data)
+	{
+		insertInTree(root->left, elem);
+	}
+	else
+	{
+		insertInTree(root->right, elem);
+	}
+}
+
+void reinsertElements(Node* root, Node* newRoot)
+{
+	insertInTree(newRoot, root->data);
+	if(hasLeft(root))
+	{
+		reinsertElements(root->left, newRoot);
+	}
+	if(hasRight(root))
+	{
+		reinsertElements(root->right, newRoot);
+	}
+}
+
+Node*  fixBrokenTree(Node* root)
+{
+	Node* newRoot = nullptr;
+	if(root != nullptr)
+	{
+		reinsertElements(root, newRoot);
+	}
+	return newRoot;
+}

Data Structures Exam/81248_GLL/04_words_in_file.cpp

@@ -0,0 +1,77 @@
+#include <fstream>
+#include <string>
+#include <map>
+#include <iostream>
+#include <vector>
+#include <algorithm>
+
+using std::ifstream;
+using std::string;
+using std::map;
+using std::cout;
+using std::endl;
+using std::pair;
+using std::vector;
+using std::sort;
+
+
+string placeFileIntoString(const char* inputFilename)
+{
+	ifstream inputFile;
+	string temp;
+	string input;
+	inputFile.open(inputFilename);
+	while(!inputFile.eof())
+	{
+		getline(inputFile, temp);
+		input += temp;
+		input.push_back('\n');
+		temp.clear();
+	}
+	input.erase(--input.end());
+	inputFile.close();
+	return input;
+}
+
+map<string, int> countWords(const string& input)
+{
+	string currentWord;
+	string copy = input;
+	map<string, int> occurences;
+	int position;
+
+	while(!copy.empty())
+	{
+		position = copy.find_first_not_of("\t .,!?");
+		copy.erase(0, position);
+		position = copy.find_first_of("\t .,!?");
+		currentWord.insert(0, copy, 0, position);
+		copy.erase(0, position);
+		occurences[currentWord]++;
+		currentWord.clear();
+	}
+	return occurences;
+}
+
+void countWordsInFile(const char* inputFilename)
+{
+	string contents = placeFileIntoString(inputFilename);
+	map<string, int> occurences = countWords(contents);
+	vector<pair<int, string> > dirtyHacksYo;
+	for(map<string, int>::iterator it = occurences.begin(); it != occurences.end(); ++it)
+	{
+		dirtyHacksYo.push_back(pair<int, string>((*it).second, (*it).first));
+	}
+	sort(dirtyHacksYo.rbegin(), dirtyHacksYo.rend());
+	for(int i = 0; i < 10; i++)
+	{
+		cout<<(i + 1)<<". "<<dirtyHacksYo[i].second<<" with "<<dirtyHacksYo[i].first<<" occurences."<<endl;
+	}
+	// LOL KEK
+}
+
+int main(int argc, char** argv)
+{
+	countWordsInFile(argv[1]);
+	return 0;
+}

Data Structures Exam/81248_GLL/lorem_ipsum.txt

@@ -0,0 +1,6 @@
+"Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod
+tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
+consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse
+cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non
+proident, sunt in culpa qui officia deserunt mollit anim id est laborum."