剑指 Offer 06. 从尾到头打印链表
1. Question
输入一个链表的头节点,从尾到头反过来返回每个节点的值(用数组返回)。
2. Examples
示例 1:
输入:head = [1,3,2]
输出:[2,3,1]
3. Constraints
0 <= 链表长度 <= 10000
4. References
来源:力扣(LeetCode) 链接:https://leetcode-cn.com/problems/cong-wei-dao-tou-da-yin-lian-biao-lcof 著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。
5. Solutions
利用栈的特性。
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public int[] reversePrint(ListNode head) {
Deque<Integer> stack = new LinkedList<>();
while (head != null) {
stack.push(head.val);
head = head.next;
}
int[] ans = new int[stack.size()];
for(int i = 0; i < ans.length; i++) {
ans[i] = stack.pop();
}
return ans;
}
}