題目：編寫一個程式，將一個圖讀入鄰接表，

（1）連結串列：

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cstdlib>
using namespace std;
struct Node{
    int data;
    struct Node* next;
};

struct H{
    int id;
    struct Node* First;
    struct H* next;
};
typedef struct H* Tu;

Tu Find(
 
int id,Tu L)
{
    Tu p=L->next;
    while(p->id!=id&&p!=NULL) p=p->next;
    return p;
}

void Insert(int x,Tu L)
{
    Node *h=L->First,*tp,*p;
    p=h;
    while(p->next!=NULL) p=p->next;
    tp=(Node*)malloc(sizeof(struct Node));
    tp->data=x;
    tp->next=NULL;
    p
 
->next=tp;
}

int main(void)
{
    Tu h,p,tp;
    struct Node *p1,*p2;
    int n,m,x,y,i;
    cin>>n>>m;
    h=(Tu)malloc(sizeof(struct H));
    h->next=NULL;
    p=h;
    for(i=1;i<=n;i++)
    {
        tp=(Tu)malloc(sizeof(struct H));
        tp->id=i;
        tp->First=(Node*)malloc
 
(sizeof(struct Node));
        tp->First->next=NULL;
        tp->next=p->next;
        p->next=tp;
        p=p->next;
    }
    
    for(i=0;i<m;i++)
    {
        cin>>x>>y;
        p=Find(x,h);
        Insert(y,p);
        
        p=Find(y,h);
        Insert(x,p);
    }
    
    p=h->next;
    while(p!=NULL)
    {
        p1=p->First->next;
        while(p1!=NULL) 
        {
            printf("(%d,%d) ",p->id,p1->data);
            p1=p1->next;
        }
        printf("\n");
        p=p->next;
    }
    return 0;
}

（2）遊標

#include<iostream>
#include<cstdio>
#include<cstdlib>
using namespace std;
const int maxn = 120;

struct Node1{
    int x1,next1;
};
struct Node1 cur1[maxn];
typedef int List1;
typedef List1 Position1;

void Init1()
{
    int i;
    for(i=0;i<maxn;i++) cur1[i].next1=i+1;
    cur1[i].next1=0;
}

Position1 Malloc1()
{
    Position1 p;
    p=cur1[0].next1;
    cur1[0].next1=cur1[p].next1;
    return p;
}

void Free1(Position1 p)
{
    cur1[p].next1=cur1[0].next1;
    cur1[0].next1=p;
}

Position1 Find1(int x,List1 L)
{
    Position1 p=cur1[L].next1;
    while(cur1[p].x1!=x&&p!=0)
    {
        p=cur1[p].next1;
    }
    return p;
}

Position1 FindEnd(List1 L)
{
    List1 p=L;
    while(cur1[p].next1!=0)
    {
        p=cur1[p].next1;
    }
    return p;
}

void Insert1(int x,List1 L)
{
    Position1 tp=Malloc1(),p;
    p=FindEnd(L);
    cur1[tp].x1=x;
    cur1[tp].next1=cur1[p].next1;
    cur1[p].next1=tp;
}

void Print1(Position1 L1)
{
    Position1 p1=cur1[L1].next1;
    while(p1!=0)
    {
        printf("%d ",cur1[p1].x1);
        p1=cur1[p1].next1;
    }
    printf("\n");
}

struct Node2{
    int x2,next2,first;
};
struct Node2 cur2[maxn];
typedef int List2;
typedef List2 Position2;

void Init2()
{
    int i;
    for(i=0;i<maxn;i++) cur2[i].next2=i+1;
    cur2[i].next2=0;
}

int Malloc2()
{
    Position2 p;
    p=cur2[0].next2;
    cur2[0].next2=cur2[p].next2;
    return p;
}

void Free2(Position2 p)
{
    cur2[p].next2=cur2[0].next2;
    cur2[0].next2=p;
}

Position2 Find2(int x,Position2 L2)
{
    Position2 p=cur2[L2].next2;
    while(cur2[p].x2!=x&&p!=0)
    {
        p=cur2[p].next2;
    }
    return p;
}

void Insert2(int x,List2 L,Position2 p)
{
    Position2 tp=Malloc2();
    cur2[tp].x2=x;
    cur2[tp].first=Malloc1();
    cur1[cur2[tp].first].next1=0;
    cur2[tp].next2=cur2[p].next2;
    cur2[p].next2=tp;
}

void Print2(List2 L2)
{
    Position2 p2=cur2[L2].next2;
    while(p2!=0)
    {
        printf("點%d的鄰接點有：\n",cur2[p2].x2); 
        Print1(cur2[p2].first);
        p2=cur2[p2].next2;
    }
    printf("\n");
}

int main(void)
{
    int n,m,i,x,y;
    cin>>n>>m;
    Init1();
    Init2();
    List2 L2,p2;
    L2=Malloc2();
    cur2[L2].next2=0;
    p2=L2;
    for(i=1;i<=n;i++)
    {
        Insert2(i,L2,p2);
        p2=cur2[p2].next2;
    }
    List1 p1,L1;
    while(m--)
    {
        cin>>x>>y;
        p2=Find2(x,L2);
        Insert1(y,cur2[p2].first);
        
        p2=Find2(y,L2);
        Insert1(x,cur2[p2].first);
    }
    
    Print2(L2);
    return 0;
}