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题目描述 用两个栈来实现一个队列,完成队列的Push和Pop操作。 队列中的元素为int类型。 1 import java.util.Stack; 2 3 public class Solution { 4 Stack<Integer> stack1 = new Stack<Integer>(); 阅读全文
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Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest l 阅读全文
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Given a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree is defined as a binary tree in which the dept 阅读全文
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题目描述 输入某二叉树的前序遍历和中序遍历的结果,请重建出该二叉树。假设输入的前序遍历和中序遍历的结果中都不含重复的数字。例如输入前序遍历序列{1,2,4,7,3,5,6,8}和中序遍历序列{4,7,2,1,5,3,8,6},则重建二叉树并返回。 思路: 前序遍历中,第一个点是根结点,根据这个根节点 阅读全文