这两道题都是用的尺取法.尺取法是<挑战程序设计竞赛>里讲的一种常用技巧. 就是O(n)的扫一遍数组,扫完了答案也就出来了,这过程中要求问题具有这样的性质:头指针向前走(s++)以后,尾指针(t)要么不动要么也往前走.满足这种特点的就可以考虑尺取法. poj3061 比较简单,也可以用二分做,时间复杂度O(n*logn).用尺取法可以O(n)解决. #include<iostream> #include<cstdio> #include<cstdlib> #i…

POJ3320 Jessica's Reading Problem set用来统计所有不重复的知识点的数,map用来维护区间[s,t]上每个知识点出现的次数,此题很好的体现了map的灵活应用 #include <iostream> #include <cstdio> #include <algorithm> #include <cstring> #include <queue> #include <vector> #include &…

Jessica's Reading Problem Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 7467   Accepted: 2369 Description Jessica's a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has spent littl…

Description Jessica's a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has spent little time on it. If she wants to pass it, she has to master all ideas included in a very thick text book. The au…

Jessica's Reading Problem Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 12346   Accepted: 4199 Description Jessica's a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has spent litt…

https://vjudge.net/problem/POJ-3320 尺取法,要想好组织方式. 又被卡了cin.. #include<iostream> #include<cstdio> #include<queue> #include<cstring> #include<algorithm> #include<cmath> #include<stack> #include<map> #include<…

jessica's Reading PJroblem Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9134   Accepted: 2951 Description Jessica's a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has spent litt…

Description Jessica's a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has spent little time on it. If she wants to pass it, she has to master all ideas included in a very thick text book. The au…

Bryce1010模板 #include <stdio.h> #include <string.h> #include <stdlib.h> #include <algorithm> #include <iostream> #include <queue> #include <stack> #include <vector> #include <map> #include <set> #…

[POJ3320]Jessica's Reading Problem Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 13095   Accepted: 4495 Description Jessica's a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has s…