Stall Reservations Oh those picky N (1 <= N <= 50,000) cows! They are so picky that each one will only be milked over some precise time interval A..B (1 <= A <= B <= 1,000,000), which includes both times A and B. Obviously, FJ must create a
在实际项目中,有时会碰到数据库SQL的特殊排序需求,举几个例子,作为参考. 1.自定义优先级 一种常见的排序需求是指定某个字段取值的优先级,根据指定的优先级展示排序结果.比如如下表: Create TABLE Fruit (id INT IDENTITY(1, 1) ,Name VARCHAR(50)); INSERT INTO Fruit (Name) VALUES ('Apple'); INSERT INTO Fruit (Name) VALUES ('Watermelon'); INSER
堆基础 堆(Heap)是具有这样性质的数据结构:1/完全二叉树 2/所有节点的值大于等于(或小于等于)子节点的值: 图片来源:这里 堆可以用数组存储,插入.删除会触发节点shift_down.shift_up操作,时间复杂度O(logn). 堆是优先级队列(Priority queue)的底层数据结构,较常使用优先级队列而非直接使用堆处理问题.利用堆的性质可以方便地获取极值,例如 LeetCode 题目 215. Kth Largest Element in an Array,时间复杂度O(nl
Rescue Time Limit : 2000/1000ms (Java/Other) Memory Limit : 65536/32768K (Java/Other) Total Submission(s) : 14 Accepted Submission(s) : 7 Font: Times New Roman | Verdana | Georgia Font Size: ← → Problem Description Angel was caught by the MOLIGPY