From 0cf994e5fdb5db06052ee55b160a3f42f3282751 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?F=C3=A1ndly=20Gerg=C5=91?= <gergo@systemtest.tk>
Date: Sat, 16 May 2020 15:52:34 +0300
Subject: [PATCH] chore: Lab09

---
 lab09/02.cpp | 215 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 215 insertions(+)
 create mode 100644 lab09/02.cpp

diff --git a/lab09/02.cpp b/lab09/02.cpp
new file mode 100644
index 0000000..6e71c76
--- /dev/null
+++ b/lab09/02.cpp
@@ -0,0 +1,215 @@
+#include <iostream>
+#include <vector>
+#include <string>
+#include <random>
+#include <ctime>
+#include <chrono>
+using namespace std;
+
+string generateWord() {
+	const string charset = "abcdefghijklmnopqrstuvwxyz";
+	int length = rand() % 20 + 1;
+	string res = "";
+	for(int i=0; i<length; i++) {
+		res += charset[rand() % 26];
+	}
+	return res;
+}
+
+class ListItem {
+public:
+	ListItem(string val) {
+		this->val = val;
+		next = NULL;
+	}
+	string val;
+	ListItem* next;
+};
+
+class List {
+private:
+	ListItem* first;
+	int cnt;
+public:
+	List() {
+		first = NULL;
+		cnt = 0;
+	}
+	ListItem* begin() {
+		return first;
+	}
+	ListItem** beginPtr() {
+		return &first;
+	}
+	void push_back(string val) {
+		if(first == NULL) {
+			first = new ListItem(val);
+		}
+		else {
+			ListItem* i = first;
+			while(i->next != NULL){
+				i = i->next;
+			}
+			i->next = new ListItem(val);
+		}
+		cnt++;
+	}
+	void clear() {
+		for(ListItem* i = first; i;) {
+			ListItem* cur = i;
+			i = i->next;
+			delete cur;
+		}
+		first = NULL;
+		cnt = 0;
+	}
+	int size() {
+		return cnt;
+	}
+
+	static ListItem* getLast(ListItem* i) {
+		while(i->next != NULL){
+			i = i->next;
+		}
+		return i;
+	}
+};
+
+void benchmarkSorts(List* v1, vector<string>* v2, int size);
+void sort_quick_driver(vector<string>* v);
+void sort_quick_driver(List* v);
+
+int main() {
+	ios::sync_with_stdio(false);
+	srand(time(0));
+
+    List v1;
+    vector<string> v2;
+
+	benchmarkSorts(&v1, &v2, 10);
+	benchmarkSorts(&v1, &v2, 1000);
+	benchmarkSorts(&v1, &v2, 10000);
+
+	return 0;
+}
+
+
+
+void generateSample(List* v1, vector<string>* v2, int size) {
+	v1->clear();
+	v2->clear();
+	cout<<"----- Sample size: "<<size<<"\n";
+    for(int i=0; i<size; i++) {
+		string w = generateWord();
+		v1->push_back(w);
+		v2->push_back(w);
+    }
+}
+void benchmarkSorts(List* v1, vector<string>* v2, int size) {
+	generateSample(v1, v2, size);
+
+	chrono::high_resolution_clock::time_point v1t1 = chrono::high_resolution_clock::now();
+	sort_quick_driver(v1);
+	chrono::high_resolution_clock::time_point v1t2 = chrono::high_resolution_clock::now();
+	int v1d = chrono::duration_cast<chrono::microseconds>(v1t2 - v1t1).count();
+	cout<<"Quick sort time for list: "<<v1d<<" us\n";
+
+	chrono::high_resolution_clock::time_point v2t1 = chrono::high_resolution_clock::now();
+	sort_quick_driver(v2);
+	chrono::high_resolution_clock::time_point v2t2 = chrono::high_resolution_clock::now();
+	int v2d = chrono::duration_cast<chrono::microseconds>(v2t2 - v2t1).count();
+	cout<<"Quick sort time for vector: "<<v2d<<" us\n";
+
+	cout<<endl;
+}
+
+int sort_quick_partition(vector<string>* v, int low, int high) {
+	string pivot = v->at(high);
+	int i = low - 1;
+
+	for(int j = low; j <= high - 1; j++) {
+		if(v->at(j) < pivot) {
+			i++;
+			swap(v->at(i), v->at(j));
+		}
+	}
+	swap(v->at(i+1), v->at(high));
+
+	return i + 1;
+}
+void sort_quick(vector<string>* v, int low, int high) {
+	if(low < high) {
+		int parti = sort_quick_partition(v, low, high);
+
+		sort_quick(v, low, parti - 1);
+		sort_quick(v, parti + 1, high);
+	}
+}
+void sort_quick_driver(vector<string>* v) {
+    sort_quick(v, 0, v->size() - 1);
+}
+
+ListItem* sort_quick_partition(ListItem* low, ListItem* high, ListItem** newLow, ListItem** newHigh) {
+	ListItem* pivot = high;
+	ListItem* prev = NULL;
+	ListItem* cur = low;
+	ListItem* tail = pivot;
+
+	while(cur != pivot) {
+		if(cur->val < pivot->val) {
+			if(*newLow == NULL) {
+				*newLow = cur;
+			}
+
+			prev = cur;
+			cur = cur->next;
+		}
+		else {
+			if(prev) {
+				prev->next = cur->next;
+			}
+			ListItem* tmp = cur->next;
+			cur->next = NULL;
+			tail->next = cur;
+			tail = cur;
+			cur = tmp;
+		}
+	}
+
+	if(*newLow == NULL) {
+		*newLow = pivot;
+	}
+
+	*newHigh = tail;
+
+	return pivot;
+}
+ListItem* sort_quick(ListItem* low, ListItem* high) {
+	if(!low || low == high) {
+		return low;
+	}
+
+	ListItem* newLow = NULL;
+	ListItem* newHigh = NULL;
+
+	ListItem* pivot = sort_quick_partition(low, high, &newLow, &newHigh);
+
+	if(newLow != pivot) {
+		ListItem* tmp = newLow;
+		while(tmp->next != pivot) {
+			tmp = tmp->next;
+		}
+		tmp->next = NULL;
+
+		newLow = sort_quick(newLow, tmp);
+		tmp = List::getLast(newLow);
+		tmp->next = pivot;
+	}
+
+	pivot->next = sort_quick(pivot->next, newHigh);
+
+	return newLow;
+}
+void sort_quick_driver(List* v) {
+	*v->beginPtr() = sort_quick(v->begin(), List::getLast(v->begin()));
+}