/**
 * Refer: 220107.cpp
 *
 * 382. Linked List Random Node
 * Given a singly linked list, return a random node's value from the linked list. Each node must have the same probability of being chosen.
 * Implement the Solution class:
 * Solution(ListNode head) Initializes the object with the integer array nums.
 * int getRandom() Chooses a node randomly from the list and returns its value. All the nodes of the list should be equally likely to be chosen.
 */