3433: [Usaco2014 Jan]Recording the Moolympics Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 55  Solved: 34[Submit][Status] Description Being a fan of all cold-weather sports (especially those involving cows), Farmer John wants to record as much of…

3433: [Usaco2014 Jan]Recording the Moolympics Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 137  Solved: 89[Submit][Status][Discuss] Description Being a fan of all cold-weather sports (especially those involving cows), Farmer John wants to record a…

http://www.lydsy.com/JudgeOnline/problem.php?id=3433 想了好久啊....... 想不出dp啊......sad 后来看到一英文题解.......... sad. 末端点排序...然后对于两个录像机有有两种情况 RECODER1(当前录制节目的区间):----- RECODER1(当前录制节目的区间):----------- 因右端点排序,所以下一个区间大概是:------------------- 可以看出,此时显然不能转移 当这个区间的左端点…

题目链接:http://www.lydsy.com/JudgeOnline/problem.php?id=3433 题意: 给出n个区间[a,b). 有两个记录器,每个记录器中存放的区间不能重叠. 求两个记录器中最多可放多少个区间. 题解: 贪心. 先按右端点从小到大排序. p1,p2分别为两个记录器的最右端. 始终令p1 < p2(避免出现大材小用). 对于每个区间s: if p1 <= s.l,则将s放入p1所在记录器.即:p1 = s.r, ans++; else if p2 <=…

题意:给出n个区间[a,b),有2个记录器,每个记录器中存放的区间不能重叠.求2个记录器中最多可放多少个区间. 解法:贪心.只有1个记录器的做法详见--关于贪心算法的经典问题(算法效率 or 动态规划).而对于2个,就是在1个的基础上(按 bi 排序,选第一个与之前没有相交的区间)维护2个值,注意要好好for循环遍历一次O(n),若想着用while直接跳过一些区间很容易出错!!!另外,遍历时要先考虑能否把当前的区间接在之前右端点较右的记录器. 1 #include<cstdio> 2 #inc…

题目描述 Being a fan of all cold-weather sports (especially those involving cows), Farmer John wants to record as much of the upcoming winter Moolympics as possible. The television schedule for the Moolympics consists of N different programs (1 <= N <=…

http://www.lydsy.com/JudgeOnline/problem.php?id=3432 题目说要相互可达,但是只需要从某个点做bfs然后判断其它点是否可达即可. 原因太简单了.....因为它是abs 所以我们二分D,然后判断即可 #include <cstdio> #include <cstring> #include <cmath> #include <string> #include <iostream> #include…

题面 Time Limit: 10 Sec Memory Limit: 128 MB Submit: 136 Solved: 90 [Submit][Status][Discuss] Description The cross-country skiing course at the winter Moolympics is described by an M x N grid of elevations (1 <= M,N <= 500), each elevation being in t…

Description [Brian Dean, 2014] Bessie the cow is competing in a cross-country skiing event at the winter Moolympic games. She starts out at a speed of 1 meter per second. However, as she becomes more tired over time, she begins to slow down. Each tim…

还是搜索~~可以看出随着D值的增大能到达的点越多，就2分d值+染色法遍历就行啦~~~ CODE： #include<cstdio>#include<iostream>#include<algorithm>#include<cstring>#include<stack>using namespace std;#define maxn 510struct node { int x,y;}st;stack<node> s;int x[max…