计算链表中有多少个节点.
样例
样例 1:
输入: 1->3->5->null
输出: 3
样例解释:
返回链表中结点个数,也就是链表的长度.
样例 2:
输入: null
输出: 0
样例解释:
空链表长度为0
public class Solution {
/**
* @param head: the first node of linked list.
* @return: An integer
*/
public int countNodes(ListNode head) {
// write your code here
int i = 0;
while(head != null){
i++;
head = head.next;
}
return i;
}
}