include stdio include stdlib include string struct Element struct Elem

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct Element
{
    struct Element  *next;
    int u,key;
};

struct Element* InitSingleLinkedList()
{
    struct Element *list;
    list = (struct Element*)malloc(sizeof(struct Element));
    list->next=NULL;
    list->u=-999999;
    list->key=-999999;
    return list;
}

void InsertAfter(struct Element* list, struct Element* y)
{
    struct Element* x,*z;
    for (x=list; x!=NULL;)
    {
        z=x;
        x=x->next;
    }
        z->next=y;
    y->next=NULL;
}

void Assign(struct Element **AM,int k,int u,int m,struct Element *new)
{
    struct Element *check;
	int h=k%m;
	if(AM[h]->next!=AM[h])
	{
		for(check = AM[h]->next; check != NULL && k!=check->key; check=check->next);
		if(check==NULL)
		{
			new->u=u;
			new->key=k;
			InsertAfter(AM[h],new);
		}
		else
		{
			check->u=u;
		}
	}
	else
	{
        new->u=u;
		new->key=k;
		InsertAfter(AM[h],new);
	}
    new=NULL;
    free(new);
}

void AT(struct Element **AM,int k,int m)
{
    int h=k%m;
    struct Element *find;
    for (find=AM[h]->next;find!=NULL && k!=find->key;find=find->next);
    if (find==NULL)
    {
        printf("0\n");
    }
    else
    {
        printf("%d\n",find->u);
    }
}

int main (int argc, char const *argv[])
{
	int n,m,k=0,El=0,i;
	struct Element **AM;
    struct Element *freee;
    struct Element *next;
	char str[6];
	scanf("%d", &n);
	scanf("%d", &m);
	AM = malloc(m * sizeof(struct Element*));
	for(i = 0; i < m;i++)
	{
		AM[i]=InitSingleLinkedList();
	}
	for(i = 0; i < n; i++)
	{
		scanf("%s",str);
		scanf("%d",&k );
		if(str[2]=='\0')
		{
			AT(AM,k,m);
		}
		else
		{
            freee=InitSingleLinkedList();
			scanf("%d",&El );
			Assign(AM,k,El,m,freee);
		}
	}
    
    for (i=0;i<m;i++)
    {
        for (freee=AM[i];freee!=NULL;)
        {
            next=freee->next;
            free(freee);
            freee=next;
            AM[i]=freee;
        }
    }
    free(AM);
     
    return 0;
}