chore: Lab10

lab10/05.cpp

@@ -0,0 +1,169 @@
+#include <iostream>
+using namespace std;
+
+class Item {
+public:
+	Item(int val) {
+		this->val = val;
+		this->prev = NULL;
+		this->next = NULL;
+	}
+
+	int val;
+	Item* prev;
+	Item* next;
+};
+
+class List {
+private:
+	Item* first;
+	Item* last;
+	int _size;
+public:
+	List() {
+		first = NULL;
+		last = NULL;
+		_size = 0;
+	}
+	void push_back(int val) {
+		_size++;
+		if(last == NULL) {
+			Item* i = new Item(val);
+			first = i;
+			last = i;
+			return;
+		}
+
+		Item* i = new Item(val);
+		last->next = i;
+		i->prev = last;
+		last = i;
+	}
+	Item* begin() {
+		return first;
+	}
+	Item* end() {
+		return last;
+	}
+	Item* find(int val) {
+		for(Item* i = begin(); i != NULL; i = i->next) {
+			if(i->val == val) {
+				return i;
+			}
+		}
+		return NULL;
+	}
+	bool erase(int pos) {
+		if(pos >= size()){
+			return false;
+		}
+
+		Item* i = begin();
+		for(int counter = 1; counter <= pos; counter++) {
+			i = i->next;
+		}
+
+        i->prev->next = i->next;
+        i->next->prev = i->prev;
+
+        delete i;
+        _size--;
+        return true;
+	}
+	int size() {
+		return _size;
+	}
+	bool swap(int pos) {
+		// swap pos with the next
+		if(pos >= size()-1){
+			return false;
+		}
+
+		Item* a = begin();
+		for(int counter = 1; counter <= pos; counter++) {
+			a = a->next;
+		}
+		Item* b = a->next;
+
+		Item* before = a->prev;
+		Item* after = b->next;
+
+		if(before) {
+			before->next = b;
+		}
+		else {
+			first = b;
+		}
+
+		a->next = after;
+		a->prev = b;
+		b->next = a;
+		b->prev = before;
+
+		if(after) {
+			after->prev = a;
+		}
+		else {
+			last = a;
+		}
+
+		return true;
+	}
+};
+
+void printList(List* v) {
+	for(Item* i = v->begin(); i; i = i->next) {
+		cout<<i->val<<" ";
+	}
+	cout<<endl;
+}
+
+void printListR(List* v) {
+	for(Item* i = v->end(); i; i = i->prev) {
+		cout<<i->val<<" ";
+	}
+	cout<<endl;
+}
+
+void test(List* v) {
+	cout<<"Forward: ";
+	printList(v);
+	cout<<"Reverse: ";
+	printListR(v);
+}
+
+int main() {
+	List v;
+
+	//test 1
+	cout<<"- Test 1\n";
+	v.push_back(10);
+	v.push_back(8);
+	v.push_back(37);
+	v.push_back(1);
+	v.push_back(0);
+	v.push_back(5);
+	test(&v);
+
+	//test 2
+	cout<<"- Test 2\n";
+	Item* x = v.find(8);
+	cout<<"Before: "<<x->prev->val<<" | Current: "<<x->val<<" | After: "<<x->next->val<<endl;
+
+    //test 3
+    cout<<"- Test 3\n";
+    v.erase(3);
+    test(&v);
+
+    //test 4
+    cout<<"- Test 4\n";
+    v.swap(2);
+    test(&v);
+
+    //test 5
+    cout<<"- Test 5\n";
+    v.swap(3);
+    test(&v);
+
+	return 0;
+}