224-基本计算器(Basic Calculator) 原文链接: https://leetcode-cn.com/problems/basic-calculator 英文原文Given a string s representing a valid expression, implemen 2021-12-03 字符串数学栈递归 困难
226-翻转二叉树(Invert Binary Tree) 原文链接: https://leetcode-cn.com/problems/invert-binary-tree 英文原文Given the root of a binary tree, invert the tree, and re 2021-12-03 二叉树广度优先搜索树深度优先搜索 简单
227-基本计算器 II(Basic Calculator II) 原文链接: https://leetcode-cn.com/problems/basic-calculator-ii 英文原文Given a string s which represents an expression, evalua 2021-12-03 字符串数学栈 中等
228-汇总区间(Summary Ranges) 原文链接: https://leetcode-cn.com/problems/summary-ranges 英文原文You are given a sorted unique integer array nums. Return th 2021-12-03 数组 简单
229-求众数 II(Majority Element II) 原文链接: https://leetcode-cn.com/problems/majority-element-ii 英文原文Given an integer array of size n, find all elements tha 2021-12-03 哈希表排序数组计数 中等
230-二叉搜索树中第K小的元素(Kth Smallest Element in a BST) 原文链接: https://leetcode-cn.com/problems/kth-smallest-element-in-a-bst 英文原文Given the root of a binary search tree, and a 2021-12-03 二叉搜索树二叉树树深度优先搜索 中等
231-2 的幂(Power of Two) 原文链接: https://leetcode-cn.com/problems/power-of-two 英文原文Given an integer n, return true if it is a power of two. Other 2021-12-03 位运算数学递归 简单
233-数字 1 的个数(Number of Digit One) 原文链接: https://leetcode-cn.com/problems/number-of-digit-one 英文原文Given an integer n, count the total number of digit 1 a 2021-12-03 动态规划数学递归 困难
232-用栈实现队列(Implement Queue using Stacks) 原文链接: https://leetcode-cn.com/problems/implement-queue-using-stacks 英文原文Implement a first in first out (FIFO) queue us 2021-12-03 栈设计队列 简单
234-回文链表(Palindrome Linked List) 原文链接: https://leetcode-cn.com/problems/palindrome-linked-list 英文原文Given the head of a singly linked list, return true 2021-12-03 双指针栈递归链表 简单