【数据结构链表实验报告】C语言数据结构旋转链表的实现

更新时间:2021-08-11    来源:C语言    手机版     字体:

【www.bbyears.com--C语言】

实例:

给出链表1->2->3->4->5->null和k=2

返回4->5->1->2->3->null

分析:

感觉很直观,直接把分割点找出来就行,记得k可能大于len,要取模

代码:

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *   int val;
 *   ListNode *next;
 *   ListNode(int x) : val(x), next(NULL) {}
 * };
 */
classSolution {
public:
  /**
   * @param head: the list
   * @param k: rotate to the right k places
   * @return: the list after rotation
   */
  ListNode *rotateRight(ListNode *head,intk) {
    // write your code here
    if(head==NULL)
      returnhead;
    intlen = 0;
    ListNode*temp = head;
    while(temp)
    {
      len++;
      temp = temp->next;
    }
    k%=len;
    if(k==0)
      returnhead;
    k = len-k;
    temp = head;
    while(k>1)
    {
      temp = temp->next;
      k--;
    }
    ListNode*newStart = temp->next;
    temp->next = NULL;
    temp = newStart;
    while(temp->next)
      temp = temp->next;
    temp->next = head;
    returnnewStart;
  }
};

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