Changed

LinearList/STL-List/main.cpp

@@ -0,0 +1,54 @@
+#include <iostream>
+#include <list>
+using namespace std;
+int main(){
+	list<string> a;
+	a.push_back("1.Ohyeah");
+	a.push_back("2.Ohno");
+	std::list<string>::iterator it = a.begin();
+	auto ite = a.cbegin();
+	cout << *ite << endl;
+	a.insert(++it, "0.Ohoh");
+	a.push_back("3.Ohhoho");
+	for(string x : a){
+		cout << x << " ";
+	}
+	cout << endl;
+	
+	//Copy a to b
+	list<string> b(a);
+	
+	auto itmp1 = a.begin();
+	itmp1++;
+	auto itmp2 = a.end();
+	itmp2--;
+	a.erase(itmp1, itmp2);
+	
+	for(string x : a){
+		cout << x << " ";
+	}
+	cout << endl << endl;
+	//Two Methods going through The Whole List
+	auto iit = a.begin();
+	for(int i = 0; i < a.size(); i++){
+		cout << *iit << " ";
+		iit++;
+	}
+	cout << endl;
+	cout << endl;
+	
+	//insert ?
+	for(string x : b){
+		cout << x << " ";
+	}
+	cout << endl;
+	auto itb = b.begin();
+	itb++;itb++;
+	b.insert(itb, a.begin(), a.end()); //insert into pos 2
+	for(string x : b){
+		cout << x << " ";
+	}
+	cout << endl;
+	return 0;
+}
+ 

LinearList/skipList/sl.cpp

@@ -0,0 +1,196 @@
+#include <iostream>
+#include <cstdio>
+#include <unistd.h>
+#include <cstdlib>
+#include <time.h>
+ 
+#define maxLevel 12
+struct Node
+{
+	int key;
+	int value;
+	Node* forward[1];
+};
+ 
+struct skipList
+{
+	int level;
+	Node* head;
+};
+ 
+class SkipList
+{
+public:
+    SkipList()
+	{
+		srand((int)time(0)); 
+		slist = (skipList*)malloc(sizeof(skipList));
+		slist->head = createNode(maxLevel, 0, 0);
+		slist->level = 0;
+		for(int i=0; i<maxLevel; ++i)
+		{
+			slist->head->forward[i] = NULL;
+		}
+	}
+ 
+	int search(int key)
+	{
+		Node *p, *q;
+		p = slist->head;
+		int k = slist->level;
+        for(int i=k; i>=0; --i)
+		{
+			while(p->forward[i] != NULL && p->forward[i]->key <= key)
+			{
+				if(p->forward[i]->key == key)
+				{
+					q = p->forward[i];
+					return q->value;
+				}
+				p = p->forward[i];
+			}
+		}
+	}
+	bool insert(int key, int value)
+	{
+		Node *p, *q;
+		Node *update[maxLevel];
+		p = slist->head;
+		int k = slist->level;
+		for(int i = k; i>=0; --i)
+		{
+			while(p->forward[i] != NULL && p->forward[i]->key < key)
+			{
+				p = p->forward[i];
+			}
+			update[i] = p;
+		}
+		
+		q = p->forward[0];
+		if(q && q->key == key)
+			return false;
+		
+		k = random();
+		if(k > slist->level)
+		{
+			for(int i=slist->level; i<=k; ++i)
+			{
+				update[i] = slist->head;
+			}
+			slist->level = k;
+		}
+ 
+		q = createNode(k, key, value);
+		for(int i = 0; i<=k; ++i)
+		{
+			q->forward[i] = update[i]->forward[i];
+			update[i]->forward[i] = q;
+		}
+ 
+		printList();
+	}
+	bool remove(int key)
+	{
+		Node *update[maxLevel];  
+		Node *p,*q;  
+		p = slist->head;  
+		int k = slist->level;  
+		for(int i = k ; i >=0 ; i --){  
+			while(p->forward[i] != NULL && (p->forward[i]->key < key)){  
+				p = p->forward[i];  
+			}  
+			update[i] = p;  
+		}  
+		q = p->forward[0];  
+		if(q && q->key == key){  
+			for(int i = 0 ; i <= k; ++i){  
+				if(update[i]->forward[i] != q)  
+					break;  
+				update[i]->forward[i] = q->forward[i];  
+			}  
+			free(q);  
+			for(int i = slist->level ; i > 0 ; i --){  
+				if(slist->head->forward[i] == NULL){  
+					slist->level --;  
+				}  
+			}
+			//printList();
+			return true;  
+		}  
+		else{  
+			return false;  
+		}  
+	}
+    virtual ~SkipList()
+	{
+		destroy();
+	}
+	
+private:
+	Node* createNode(int level, int key, int value)
+	{
+		Node* node = (Node*)malloc(sizeof(Node) + level*sizeof(Node*));
+		node->key = key;
+		node->value = value;
+		return node;
+	}
+	int random()
+	{
+		int k = 0;
+		while(rand() %2) k++;
+		k = k>maxLevel?maxLevel:k;
+		return k;
+	}
+	void printList()
+	{
+		Node *p,*q;  
+		int k=slist->level;  
+		for(int i=k; i >= 0; i--)  
+		{  
+			p = slist->head->forward[i];  
+			printf("level[%d]: ",i);  
+			while(p->forward[i] != NULL)  
+			{  
+				printf("%d -> ",p->value);  
+				p = p->forward[i];  
+			}  
+			printf("%d\n",p->value);  
+		}  
+		printf("\n");  
+	}
+	void destroy()
+	{
+		Node *p, *q;
+		int k = slist->level;
+		p = slist->head;
+		for(int i= k; i>=0; --i)
+		{
+			while((q = p) !=NULL)
+			{
+				free(q);
+				p = p->forward[i];
+			}
+		}
+		free(slist);
+		slist = NULL;
+	}
+private:
+    skipList* slist;
+};
+ 
+ 
+int main(){
+	
+	SkipList skip;
+	for(int i=1; i<20; ++i)
+	{
+		skip.insert(i, 2*i);		
+	}
+ 
+	int v = skip.search(5);
+	std::cout << v << "\n";
+	skip.remove(5);
+	std::cout << skip.search(5)<< "\n";
+	sleep(2);
+    return 0;  
+}