Mayor's posters Time Limit: 1000MS    Memory Limit: 65536K   Description 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 cit…

Mayor's posters Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 54067   Accepted: 15713 Description The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral post…

/* poj 2528 Mayor's posters 线段树 + 离散化 离散化的理解: 给你一系列的正整数, 例如 1, 4 , 100, 1000000000, 如果利用线段树求解的话,很明显 会导致内存的耗尽.所以我们做一个映射关系,将范围很大的数据映射到范围很小的数据上 1---->1 4----->2 100----->3 1000000000----->4 这样就会减少内存一些不必要的消耗 建立好映射关系了,接着就是利用线段树求解 */ #include<ios…

题目链接: 传送门 Mayor's posters Time Limit: 1000MS     Memory Limit: 65536K Description 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…

题目: 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 build an electoral wall for placing…

个人心得:线段树也有了一定的掌握,线段树对于区间问题的高效性还是挺好的,不过当区间过大时就需要离散化了,一直不了解离散化是什么鬼,后面去看了下 离散化,把无限空间中有限的个体映射到有限的空间中去,以此提高算法的时空效率. 通俗的说,离散化是在不改变数据相对大小的条件下,对数据进行相应的缩小.例如: 原数据:1,999,100000,15:处理后:1,3,4,2: 原数据:{100,200},{20,50000},{1,400}: 处理后:{3,4},{2,6},{1,5}: 线段树还有一个重要点…

http://poj.org/problem?id=2528 https://www.luogu.org/problem/UVA10587 Description 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…

题目 给定每张海报的覆盖区间,按顺序覆盖后,最后有几张海报没有被其他海报完全覆盖.离散化处理完区间端点,排序后再给相差大于1的相邻端点之间再加一个点,再排序.线段树,tree[i]表示节点i对应区间是哪张海报,如果是-1代表对应区间不是一张海报(0或多张).每贴一张海报,就用二分查找出覆盖的起点和终点对应的离散后的下标,然后更新区间.线段树的区间更新可以加上懒惰标记(或延迟标记,但是这题可以不用另外标记. #include<cstdio> #include<cstring> #in…

Mayor's posters Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 59239   Accepted: 17157 Description The citizens of Bytetown, AB, could not stand that the candidates in the mayoral election campaign have been placing their electoral post…

题目分析:线段树区间更新+离散化 代码如下: # include<iostream> # include<cstdio> # include<queue> # include<vector> # include<list> # include<map> # include<set> # include<cstdlib> # include<string> # include<cstring&g…