Count Color Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 41202   Accepted: 12458 Description Chosen Problem Solving and Program design as an optional course, you are required to solve all kinds of problems. Here, we get a new problem.…

这个是一个经典线段树染色问题,不过题目给的是左右左右坐标,即[0,3]包含0-1这一段 1-2这一段 2-3这一段,和传统的染色不太一样,不过其实也不用太着急. 我们把左边的坐标+1,即可,那么[0,3]其实变成了[1,3]而线段树是按照点询问的,也就是每个点代表的颜色,我们就有了1,2,3,这个三个,并且避免了线段树编号不能到0的情况,然后代码就十分简单了,无需laze标记,因为每个节点的颜色就可以当成laze标记,然后不断往下pushdown既可以,当时还有一个问题就是线段树访问连续两个节点…

Count Color Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 42940   Accepted: 13011 Description Chosen Problem Solving and Program design as an optional course, you are required to solve all kinds of problems. Here, we get a new problem.…

传送门:Count Color Description Chosen Problem Solving and Program design as an optional course, you are required to solve all kinds of problems. Here, we get a new problem. There is a very long board with length L centimeter, L is a positive integer, so…

题目链接:https://vjudge.net/problem/POJ-2528 The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral posters at all places at their whim. The city council has finally decided to…

Count the Colors Time Limit:2000MS    Memory Limit:65536KB    64bit IO Format:%lld & %llu SubmitStatus Description Painting some colored segments on a line, some previously painted segments may be covered by some the subsequent ones. Your task is cou…

题意:给一段0-8000的线段染色 问最后 颜色x 有几段 题解:标准线段树  但是没有push_up  最后查询是单点按顺序查询每一个点 考虑过使用区间来维护不同的线段有多少种各色的线段  思路是 两个子区间合并:左子区最右边和右子区最左边如果相同,那么就不变,不同就+1  但是不好维护  所以直接单点查还更方便 注意  染色是染区间不是染点 例如   0  3是染  0 1 2 3这4个数中间的空  如果不考虑清楚这一点就会导致 染了  2-3 颜色1  0 2颜色2   3-4颜色3  0…

Hotel The cows are journeying north to Thunder Bay in Canada to gain cultural enrichment and enjoy a vacation on the sunny shores of Lake Superior. Bessie, ever the competent travel agent, has named the Bullmoose Hotel on famed Cumberland Street as t…

给定一棵有n个节点的无根树和m个操作,操作有2类: 1.将节点a到节点b路径上所有点都染成颜色c: 2.询问节点a到节点b路径上的颜色段数量(连续相同颜色被认为是同一段), 如“112221”由3段组成:“11”.“222”和“1”. 请你写一个程序依次完成这m个操作=. 题解:树链剖分+线段树,线段树维护区间左右的颜色和种类数,合并就很简单了,考虑左区间的右端点和右区间的左端点是不是一样颜色,然后树上暴跳的时候要比较深度来跳了,然后修改也是在树上暴跳即可 /******************…

题意:就是相当于动规里面的求最大连续子串,不同的是,这里需要读入一个区间x,y,输出的区间 a,b 且x<=a<=b<=y,使得a b的连续子串最长,而且询问次数达到了10的五次方. 我是在大白书上看到这个题,一开始想简单了,就照着刘汝佳的思路写,线段树里只存了前缀最大和,后缀最大和,总最大和,但题目要求输出区间,明显的需要添加记录维护区间位置的,而且不止要存储 a,b,还要存pre suf,前缀 后缀的边界位置.我第一次写的时候意识到了,但是那个时候已经有点混乱了,我以为在查询的时候,…