1019. Next Greater Node In Linked List
Problem Setting¶
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.
| Variable | Type | Description |
|---|---|---|
| head | linked list | the first linked list object |
| answer | list of int | an array of integers where answer[i] = next_larger(node_{i+1}) |
In [101]:
from graphviz import Digraph
# Create Digraph object
dot = Digraph()
dot.attr(rankdir='LR', size='8,5')
dot.node('1')
dot.node('2')
dot.node('3')
dot.edges(['12', '23'])
dot
Out[101]: