摘要：
class RandomListNode { int label; RandomListNode next = null; RandomListNode random = null; RandomListNode(int label) { this.label = label; } } /** * 阅读全文
摘要：
import java.util.ArrayList; class TreeNode { int val = 0; TreeNode left = null; TreeNode right = null; public TreeNode(int val) { this.val = val; } } 阅读全文