链表练习题

  1 //链表相关问题
  2 
  3 typedef int DataType;
  4 typedef struct LinkNode  //单链表结构
  5 {
  6     struct LinkNode* next;
  7     DataType data;
  8 }LinkNode;
  9 
 10 LinkNode *CreateNode(DataType x) //创建单链表节点
 11 {
 12     LinkNode *tmp = (LinkNode *)malloc(sizeof(LinkNode));
 13     if (NULL == tmp)
 14     {
 15         printf("分配内存失败！\n");
 16         return NULL;
 17     }
 18     tmp->next=NULL;
 19     tmp->data=x;
 20     return tmp;
 21 }
 22 
 23 void PrintLinkList(LinkNode *phead)  //单链表打印
 24 {
 25     while (phead)
 26     {
 27         printf("%d ",phead->data);
 28         phead = phead->next;
 29     }
 30     printf("\n");
 31 }
 32 
 33 void InsertLinkList(LinkNode **phead,LinkNode *pos,DataType x)  //单链表插入
 34 {
 35     LinkNode *newNode,*tmp = *phead;
 36     assert(phead);
 37     if (NULL==*phead)
 38     {
 39         *phead = CreateNode(x);
 40         return;
 41     }
 42     while(*phead != pos)
 43     {
 44         tmp = *phead;
 45         *phead = (*phead)->next;
 46     }
 47     newNode = CreateNode(x);
 48     newNode->next = tmp->next;
 49     tmp->next = newNode;
 50 }
 51 
 52 size_t ListNodeCount(LinkNode* phead) //计算单链表的节点数
 53 {
 54     size_t count = 0;
 55     while (phead)
 56     {
 57         count++;
 58         phead = phead->next;
 59     }
 60     return count;
 61 }
 62 
 63 LinkNode *LinkListSearch(LinkNode *phead,DataType x)  //在单链表中查找一个数
 64 {
 65     while(phead)
 66     {
 67         if (phead->data == x)
 68             return phead;
 69         phead = phead->next;
 70     }
 71     return NULL;
 72 }
 73 
 74 LinkNode *ReverseLinkList(LinkNode *phead)  //单链表的逆置
 75 {
 76     LinkNode *first = phead;
 77     LinkNode *cur = first->next;
 78     first->next=NULL;
 79 
 80     while (cur)
 81     {
 82         LinkNode *tmp = cur->next;
 83         cur->next = first;
 84         first = cur;
 85         cur = tmp;
 86     }
 87     return first;
 88 }
 89 
 90 size_t RemoveLinkList(LinkNode **phead,LinkNode *pos)  //单链表任意节点删除
 91 {
 92     LinkNode *first = *phead;
 93     while (first)
 94     {
 95         if (*phead == pos) //删头节点
 96         {
 97             *phead = first->next;
 98             free(pos);
 99             pos = NULL;
100             return 1;
101         }
102         else if (first->next == pos) //非头节点情况
103         {
104             first->next = pos->next;
105             free(pos);
106             pos = NULL;
107             return 1;
108         }
109         first = first->next;
110     }
111     return 0;
112 }
113 
114 typedef struct DoubleLinkList  //双链表结构
115 {
116     DataType data;
117     struct DoubleLinkList *prev;
118     struct DoubleLinkList *next;
119 }DoubleList;
120 
121 DoubleList *CreateDoubleList(DataType x) //创建双链表节点
122 {
123     DoubleList *newNode = (DoubleList *)malloc(sizeof(DoubleList));
124     assert(newNode);
125     newNode->next = NULL;
126     newNode->prev = NULL;
127     newNode->data = x;
128     return newNode;
129 }
130 
131 void PrintDoubleList(DoubleList *phead)  //打印双链表
132 {
133     DoubleList *tmp = phead;
134     while (tmp)
135     {
136         printf("%d ",tmp->data);
137         tmp = tmp->next;
138         if (tmp == phead)
139             break;
140     }
141     printf("\n");
142 }
143 
144 DoubleList *DoubleListSearch(DoubleList *phead,DataType x)  //双链表查找
145 {
146     DoubleList *tmp = phead;
147     while (phead)
148     {
149         if (phead->data == x)
150             return phead;
151         if (tmp == phead->next)
152             break;
153         phead = phead->next;
154     }
155     return NULL;
156 }
157 
158 void DoubleListInsert(DoubleList **phead, DataType x) //双链表的头插
159 {
160     DoubleList *tmp = (*phead);
161     DoubleList *newNode = CreateDoubleList(x);
162 
163     if (NULL == *phead)
164     {
165         *phead = newNode;
166         (*phead)->next = *phead;
167         (*phead)->prev = *phead;
168     }
169     else 
170     {
171         newNode->next = (*phead)->next;
172         (*phead)->next = newNode;
173         newNode->prev = *phead;
174         newNode->next->prev = newNode;
175     }
176 }
177 
178 
179 size_t RemoveDoubleListNode(DoubleList **phead,DataType x)  //删除双链表节点
180 {
181     DoubleList *tmp = *phead;
182     while (*phead)
183     {
184         if (tmp->data == x)
185         {
186             tmp->prev->next = tmp->next;
187             tmp->next->prev = tmp->prev;
188             if (tmp->data == (*phead)->data)
189                *phead = tmp->next;
190             if ((*phead)->next == *phead)
191             {
192                 free(*phead);
193                 *phead = NULL;
194             }
195             free(tmp);
196             tmp = NULL;
197             return 1;
198         }
199         if (*phead == tmp->next)
200             break;
201         tmp = tmp->next;
202     }
203     return 0;
204 }