题目地址:http://poj.org/problem?id=2777 Count Color Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 30995 Accepted: 9285 Description Chosen Problem Solving and Program design as an optional course, you are required to solve all kinds of pr…
http://poj.org/problem?id=2828 Buy Tickets Time Limit: 4000MS Memory Limit: 65536K Total Submissions: 10478 Accepted: 5079 Description Railway tickets were difficult to buy around the Lunar New Year in China, so we must get up early and join a lo…
题目链接: poj 2777 Count Color 题目大意: 给出一块长度为n的板,区间范围[1,n],和m种染料 k次操作,C a b c 把区间[a,b]涂为c色,P a b 查询区间[a,b]有多少种不同颜色 解题思路: 很明显的线段树的区间插入和区间查询,但是如何统计有多少不同的颜色呢? 如果每个结点数组来存储颜色的种类,空间复杂度很高,而且查询很慢 颜色最多只有30种,可以用位运算中的“按位或|” 颜色也用二进制来处理,和存储: 第一种颜色的二进制表示1 第二种颜色…
题目链接 Description During the War of Resistance Against Japan, tunnel warfare was carried out extensively in the vast areas of north China Plain. Generally speaking, villages connected by tunnels lay in a line. Except the two at the ends, every village…
Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 42472 Accepted: 12850 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…
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 we can evenly d…
Description Railway tickets were difficult to buy around the Lunar New Year in China, so we must get up early and join a long queue… The Lunar New Year was approaching, but unluckily the Little Cat still had schedules going here and there. Now, he ha…
Count Color Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 38921 Accepted: 11696 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.…
http://poj.org/problem?id=3264 题目大意: 给定N个数,还有Q个询问,求每个询问中给定的区间[a,b]中最大值和最小值之差. 思路: 依旧是线段树水题~ #include<cstdio> #include<cstring> #include<algorithm> using namespace std; const int MAXN=50000+10; const int MAXM=MAXN<<2; const int INF=…
题目链接:http://poj.org/problem?id=3667 题目大意:一共有n个房间,初始时都是空的,现在有m个操作,操作有以下两种: 1.1 d :询问是否有连续d个空的房间,若有则输出连续房间的起始编号,若无则输出0 2.2 xi d:将第xi个房间至第xi+d-1个房间清空 解题思路:线段树维护区间最大连续长度,tree[cur].lm代表以区间左端点为起点的连续段的长度 tree[cur].rm代表以区间右端点为终点的连续段的长度,tree[2*cur].rm+tree[2*…
题意: 把手臂都各自看成一个向量,则机械手的位置正好是手臂向量之和.旋转某个关节,其实就是把关节到机械手之间的手臂向量统统旋转. 由于手臂很多,要每个向量做相同的旋转操作很费时间.这时就可以想到用线段树的优势正是可以快速地成段更新.和一般的成段更新题目没什么差别,只是通常成段替换.或者成段增加.这时候要做的是,对向量成段得做旋转变换.只要利用旋转变化矩阵即可. 要注意,从第 s 节手臂开始到机械手要旋转的角度,和第 s - 1 节手臂的角度有关.因此我们还要记录每个手臂的角度,并且去Query得…
Count Color Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 33311 Accepted: 10058 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. The…
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1542 参考网址:http://blog.csdn.net/sunmenggmail/article/details/7984589 Problem Description There are several ancient Greek texts that contain descriptions of the fabled island Atlantis. Some of these texts…