README
¶
1019. Next Greater Node In Linked List
题目
We are given a linked list with head as the first node. Let's number the nodes in the list: node_1, node_2, node_3, ... etc.
Each node may have a next larger value: for node_i, next_larger(node_i) is the node_j.val such that j > i, node_j.val > node_i.val, and j is the smallest possible choice. If such a j does not exist, the next larger value is 0.
Return an array of integers answer, where answer[i] = next_larger(node_{i+1}).
Note that in the example inputs (not outputs) below, arrays such as [2,1,5] represent the serialization of a linked list with a head node value of 2, second node value of 1, and third node value of 5.
Example 1:
Input: [2,1,5]
Output: [5,5,0]
Example 2:
Input: [2,7,4,3,5]
Output: [7,0,5,5,0]
Example 3:
Input: [1,7,5,1,9,2,5,1]
Output: [7,9,9,9,0,5,0,0]
Note:
- 1 <= node.val <= 10^9 for each node in the linked list.
- The given list has length in the range [0, 10000].
题目大意
给出一个链表，要求找出每个结点后面比该结点值大的第一个结点，如果找不到这个结点，则输出 0 。
解题思路
这一题和第 739 题、第 496 题、第 503 题类似。也有 2 种解题方法。先把链表中的数字存到数组中，整道题的思路就和第 739 题完全一致了。普通做法就是 2 层循环。优化的做法就是用单调栈，维护一个单调递减的栈即可。
Documentation
Source Files