LeetCode-206-单链表逆序
问题描述
LeetCode - Reverse Linked List
将单链表逆序
算法1 插入法
性能:
Runtime: 4 ms, faster than 89.98% of C online submissions for Reverse Linked List.
算法思路：
类比于插入排序，两个指针 first 和 last 分别指向已经逆序好的开头和结尾，即 first->x->x->last->NULL
- 开始时，first和last都指向head。
- 然后从 head->next 开始，遍历链表，将每个节点 p 插入到(first,last)的开头，即p->fist->x->x->NULL
代码如下
struct ListNode* reverseList(struct ListNode* head){
if (head->next == NULL) return head;
struct ListNode* first = head; // (first, last) 是已经逆序的部分，first->xx->last
struct ListNode* last = head;
// 遍历链表，往前插入
struct ListNode* p = head->next;
last->next = NULL;
while(p != NULL) {
// first->xxx->head, 插入p，变为 p->first->xx->head
struct ListNode* pNext = p->next; // 先记录p->next
p->next = first;
first = p;
p = pNext;
}
return first;
}C solution fast than 89.98%, Similar to Insert Sort algorithm
算法2 新增一个头节点pre，不断将数据插入pre后面
C++ Iterative and Recursive
这是discuss区一个vote较高的答案，思路和我的算法很像，都是插入。
不过，它是新增了一个头结点pre，然后遍历链表，不断的把节点，插入到pre后面
(1) 新增节点pre, pre->next 指向 head， 即 (pre->head)
(2) cur 指向 head，不断的把 cur->next 插入到 pre 和 head 之间. ( cur 位置不变，始终是指向head的。但是随着插入的进行，cur->next 不断往后了）
比如原List是 1->2->3->4->NULL，那么新增一个pre，变成pre->1->2->3->4->NULL，cur始终指向head，即 1，但是随着插入的进行，cur->next 依次变成了2，3，4
struct ListNode* reverseList(struct ListNode* head) {
struct ListNode *pre = malloc(sizeof(struct ListNode));
struct ListNode *cur = head;
pre -> next = head;
while (cur && cur -> next) {
struct ListNode* temp = pre -> next;
pre -> next = cur -> next;
cur -> next = cur -> next -> next;
pre -> next -> next = temp;
}
return pre -> next;
}算法4 插入法更精简写法
从所有递交结果中捞出的速度最快的算法
思路和算法1一样，相当于 prev 就是first，head就是last。只是更精简而已。
(prev, head) 是已经逆序的，然后不断head往后走，然后把head->next插入到开头。
struct ListNode* reverseList(struct ListNode* head) {
if (head == NULL || head->next == NULL) return head;
struct ListNode* prev = NULL;
while (head != NULL) {
struct ListNode* temp = head;
head = head->next;
temp->next = prev;
prev = temp;
}
return prev;
}算法5 递归
struct ListNode* reverseList(struct ListNode* head) {
if (head == NULL || head->next == NULL) return head;
struct ListNode* node = reverseList(head->next);
if (head->next->next == NULL) printf("NULL\n");
head->next->next = head; // head->next 就是 node所逆序链表的最后一个元素
head->next = NULL;
return node;
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作者：JarvisChu
原文链接：LeetCode-206-单链表逆序
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