ZOJ 2002 Copying Books 二分 贪心】的更多相关文章

传送门:Zoj2002 题目大意:从左到右把一排数字k分,得到最小化最大份,如果有多组解,左边的尽量小. 思路:贪心+二分(参考青蛙过河). 方向:从右向左. 注意:有可能最小化时不够k分.如                                     3 3                            1 2 3   k分得到最小化的最大值是3,分组却只能分两个组.    错误结果是 1 2 / 3.正确结果是1 / 2 / 3   因此要从左到右补齐'/' #inclu…
题目链接: 题目 Copying Books Time limit: 3.000 seconds 问题描述 Before the invention of book-printing, it was very hard to make a copy of a book. All the contents had to be re-written by hand by so called scribers. The scriber had been given a book and after s…
题目描写叙述开头一大堆屁话,我还细致看了半天..事实上就最后2句管用.意思就是给出n本书然后要分成k份,每份总页数的最大值要最小.问你分配方案,假设最小值同样情况下有多种分配方案,输出前面份数小的,就像字典序输出从小到大一样的意思. 这里用到贪心的方法,定义f(x)为真的条件是满足x为最大值使n本书分成k份,那么就是求x的最小值.怎样确定这个x就是用的二分法,x一定大于0小于全部值的合,不断的二分再推断是否成立,成立就取左半边,不成立说明太小了就取右半边,写的时候还是没有把二分法理解透彻,我还怕…
Before the invention of book-printing, it was very hard to make a copy of a book. All the contents had to be re-written by hand by so called scribers. The scriber had been given a book and after several months he finished its copy. One of the most fa…
求使最大值最小,可以想到二分答案. 然后再根据题目意思乱搞一下,按要求输出斜杠(这道题觉得就这一个地方难). Code /** * UVa * Problem#12627 * Accepted * Time:0ms */ #include<iostream> #include<cstdio> #include<cctype> #include<ctime> #include<cstring> #include<cstdlib> #in…
  Copying Books  Before the invention of book-printing, it was very hard to make a copy of a book. All the contents had to be re-written by hand by so called scribers. The scriber had been given a book and after several months he finished its copy. O…
题目链接: 传送门 Copying Books Time Limit: 3000MS     Memory Limit: 32768 KB Description Before the invention of book-printing, it was very hard to make a copy of a book. All the contents had to be re-written by hand by so called scribers. The scriber had b…
Copying Books 给出一个长度为m的序列\(\{a_i\}\),将其划分成k个区间,求区间和的最大值的最小值对应的方案,多种方案,则按从左到右的区间长度尽可能小(也就是从左到右区间长度构成的序列的字典序最小),\(m,k\leq 500\). 解 显然最大值的最小值想到二分,其实dp也可以,因为区间划分问题有可递推性,而且它能求出答案. 二分一个东西就等于换时间复杂度增加个\(log(n)\)增加了一个已知条件,虽然前提是单调性,但不妨以后缺少条件,先考虑二分再找单调性. 我们二分\(…
Copying  Books 题目链接:http://acm.hust.edu.cn/vjudge/contest/view.action?cid=85904#problem/B 题目: Description Before the invention of book-printing, it was very hard to make a copy of a book. All the contents had to be re-written by hand by so calledscri…
Intervals 题目连接: http://codeforces.com/gym/100231/attachments Description 给你n个区间,告诉你每个区间内都有ci个数 然后你需要找一个最小的点集,使得满足这n个区间的条件 Input n 然后li,ri,ci Output 输出最小点集大小 Sample Input 5 3 7 3 8 10 3 6 8 1 1 3 1 10 11 1 Sample Output 6 Hint 题意 题解: 线段树+二分+贪心 首先我们贪心一…