Sequence operation Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 7502    Accepted Submission(s): 2233 Problem Description lxhgww got a sequence contains n characters which are all '0's or '1…

看到讲课安排上 线段树有一节课"区间合并" 我是迷茫的 因为并没有见过 然后了解了一下题目 发现以前写过 还是很麻烦的树链剖分 大概是 解决带修改的区间查询"连续问题" 意思就是给一个数组 要对这个数组进行修改 然后进行区间查询 查询的一般是 l r 区间内的 连续xx 可能是LCIS 也可能只是连续的数字.. 解题的方法比较固定 由于是 连续性 相关 所以对于每个数组 维护它的左边与右边与全局的性质 例如紧靠左(右)边连续xx的长度和这个区间内连续xx的最长长度…

题意: Change operations:0 a b change all characters into '0's in [a , b]1 a b change all characters into '1's in [a , b]2 a b change all '0's into '1's and change all '1's into '0's in [a, b]Output operations:3 a b output the number of '1's in [a, b]4…

Sequence operation Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 8308    Accepted Submission(s): 2507 Problem Description lxhgww got a sequence contains n characters which are all '0's or '1'…

这个是去年遗留历史问题,之前思路混乱,搞了好多发都是WA,就没做了 自从上次做了大白书上那个双重懒惰标记的题目,做这个就思路很清晰了 跟上次大白上那个差不多,这个也是有一个sets标记,代表这个区间全部置为0或者1,没有置位的时候为-1 还有个rev标记,代表翻转操作,0代表当前不翻,1代表当前翻 要注意一下优先级,发现有不同的弄法,我是这个弄得,有set操作的时候,set标记设值,并把当前节点的rev标记设为0,因为不管要不要rev,当前set操作肯定直接覆盖了 rev操作不改变set操作,在…

Weak Pair Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 439    Accepted Submission(s): 155 Problem Description You are given a rooted tree of N nodes, labeled from 1 to N. To the ith node a…

Assign the task Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1647    Accepted Submission(s): 753 Problem Description There is a company that has N employees(numbered from 1 to N),every emplo…

Queue-jumpers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3348    Accepted Submission(s): 904 Problem Description Ponyo and Garfield are waiting outside the box-office for their favorite mo…

Transformation Time Limit: 15000/8000 MS (Java/Others)    Memory Limit: 65535/65536 K (Java/Others) Total Submission(s): 4095    Accepted Submission(s): 1008 Problem Description Yuanfang is puzzled with the question below:  There are n integers, a1,…

威威猫系列故事——晒被子 Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others) Total Submission(s): 1592    Accepted Submission(s): 444 Problem Description 因为马拉松初赛中吃鸡腿的题目让不少人抱憾而归,威威猫一直觉得愧对大家,这几天他悄悄搬到直角坐标系里去住了. 生活还要继续,太阳也照常升起,今天,威威猫在…