[数据结构与算法]Java 数据结构

从尾到头打印链表

class Solution {
    public int[] reversePrint(ListNode head) {
        LinkedList<Integer> stack = new LinkedList<Integer>();
        while(head != null) {
            stack.addLast(head.val);
            head = head.next;
        }
        int[] result = new int[stack.size()];
        for(int i = 0; i < result.length; i++)
            result[i] = stack.removeLast();
    return result;
    }
}

class Solution {
    public int[] reversePrint(ListNode head) {
        ListNode cur = head;
        int count = 0;
        while (cur != null) {
            cur = cur.next;
            count++;
        }
        int[] array = new int[count];
        cur = head;
        count--;
        while (cur != null && count >= 0) {
            array[count--] = cur.val;
            cur = cur.next;
        }
        return array;
    }
}