729. 我的日程安排表 I https://leetcode.cn/problems/my-calendar-i
950. 按递增顺序显示卡牌 https://leetcode.cn/problems/reveal-cards-in-increasing-order
1700. 无法吃午餐的学生数量 https://leetcode.cn/problems/number-of-students-unable-to-eat-lunch
155. 最小栈 https://leetcode.cn/problems/min-stack
1670. 设计前中后队列 https://leetcode.cn/problems/design-front-middle-back-queue
895. 最大频率栈 https://leetcode.cn/problems/maximum-frequency-stack
284. 窥探迭代器 https://leetcode.cn/problems/peeking-iterator
设计类题目都是让你把基本数据结构进行组合，去解决某些具体场景中的问题。我们先来看几道比较简单但比较有意思的题目吧。