Source code for submission s1331

Go to diff to previous submission

#include <iostream>
#include <stdio.h>
#include <string>
#include <string.h>
 
using namespace std;
 
 
class node
{
public:
	node * prev;
	node * next;
	char val;
	node(char a)
	{
		prev = next = NULL;
		val = a;
	}
};
 
class linkedlist
{
public:
	node * start;
	node * end;
    node * actual;
 
	void create(const char * arr)
	{
		start = end = actual = NULL;
		node * tmp = NULL;
		node * old = NULL;
		while(*arr)
		{
			tmp = new node(*arr);
			tmp->prev = old;
			if (old)
				old->next = tmp;
			else
				start = tmp;
			old = tmp;			//printf("%s\n", megarr);
			arr++;
		}
		if (tmp)
			tmp->next = NULL;
		end = tmp;
		actual = start;
	}
 
	void goback(int steps)
	{
		while(steps--)
		{
			if (!actual->prev)
				return;
			actual = actual->prev;
		}
	}
 
	bool contain(const char * str, int stringlen)
	{
		node * ptr = actual;
		while(stringlen--)
		{        
			if (!ptr || ptr->val != *(str++))
				return false;
			ptr = ptr->next;
		}
		return true;
	}
 
	void del(int size)
	{
		//print();
		node * tosetprev = actual->prev;
 
		while(size--)
		{
			node * tmp = actual;
			actual = actual->next;
			delete tmp;
		}        
		if (!actual)
		{
			actual=tosetprev;
			if (tosetprev) tosetprev->next = NULL;
		}
		else
		{
			actual->prev = tosetprev;
			if (tosetprev) tosetprev->next = actual;
		}
 
		if(!tosetprev) start = actual;
		//print();	
	}
 
	bool notEnd()
	{
		return actual;
	}
 
	void gonext()
	{
		actual = actual->next;
	}
 
	void print()
	{
		node * tmp = start;
		while(tmp)
		{
			printf("%c",tmp->val);
			tmp = tmp->next;
		}
		printf("\n");
	}
};
 
 
int main ()
{
	char * bug = new char[2000001];
	int lines, buglen;
	char * megarr = new char[2000001];
	while ( scanf("%d %s\n", &lines ,bug) == 2 )
	{
	//cout << "line: " << lines << endl;
		buglen = strlen(bug);
		while (lines--)
		{
			cin.getline(megarr,2000000,'\n');
			linkedlist ll;			
			ll.create(megarr);
			while(ll.notEnd())
			{
				if (ll.contain(bug,buglen))
				{
					ll.del(buglen);
					ll.goback(buglen);
				}
				else
				{
					ll.gonext();
				}
			}
			ll.print();
		}
	}
 
 
	return 0;
}
 

Diff to submission s1319

--- c4.s1319.cteam023.bugs.cpp.0.bugs.cpp
+++ c4.s1331.cteam023.bugs.cpp.0.bugs.cpp
@@ -85,11 +85,13 @@
                 {
                         actual=tosetprev;
-                        tosetprev->next = NULL;
+                        if (tosetprev) tosetprev->next = NULL;
                 }
                 else
                 {
                         actual->prev = tosetprev;
-                        tosetprev->next = actual;
+                        if (tosetprev) tosetprev->next = actual;
                 }
+                
+                if(!tosetprev) start = actual;
                 //print();      
         }