939E - Maximize! 思路: 贪心:最后的集合是最大值+前k小个 因为平均值时关于k的凹形函数,所以可以用三分求最小值 又因为后面的k肯定比前面的k大,所以又可以双指针 三分: #include<bits/stdc++.h> using namespace std; #define ll long long #define pb push_back #define mp make_pair #define pli pair<ll,int> #define mem(a,b…

E. Maximize! time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output You are given a multiset S consisting of positive integers (initially empty). There are two kind of queries: Add a positive int…

<题目链接> 题目大意:给定一段序列,每次进行两次操作,输入1 x代表插入x元素(x元素一定大于等于之前的所有元素),或者输入2,表示输出这个序列的任意子集$s$,使得$max(s)-mean(s)$表示这个集合的最大值与平均值的最大差值. 解题分析:首先,因为输入的$x$是非递减的,所以要使$max(s)-mean(s)$最大,肯定$max(s)$就是最后一个输入元素的大小.$x$已经确定了,现在就是尽可能的使$mean(s)$尽可能的小.如何使得平均值最小呢?肯定是从最前面的最小的元素开始…

传送门 二分答案好题. 题意简述:要求支持动态在一个数列队尾加入一个新的数(保证数列单增),查询所有子数列的 最大值减平均值 的最大值. 然而网上一堆高人是用三分做的. 我们先考虑当前的答案有可能由什么构成. 加入最后一个数之前的最大值. 加入最后一个数之后,以最后一个数为最大值的值. 于是问题变成了去求min{(∑j=1iai)+ani+1}min\{\frac{(\sum_{j=1}^ia_i)+a_n}{i+1}\}min{i+1(∑j=1i​ai​)+an​​} 然后令bi=(∑j=1i…

题意 : 给出两个操作,① 往一个序列集合(初始为空)里面不降序地添加数字.② 找出当前序列集合的一个子集使得 (子集的最大元素) - (子集的平均数) 最大并且输出这个最大差值 分析 :  首先关注到 ① 操作是有序地添加数 然后为了回答 ② 的问询,来分析一波 直觉告诉我们,要最大化差值,选取的子集最大元素应当越大越好 这一点是对的,具体的证明可以看 CF 的官方题解 那么也就是说选出的子集里面必定有当前序列集合的最大值元素 然后为了使(子集的平均数)越小,直觉又告诉我们 需要贪心地选择小的…

Maximize 题意:整个程序有2种操作,操作1将一个元素放入集合S中,且保证最新插入的元素不小于上一次的元素, 操作2 找到集合S中的某个子集合, 使得 集合中最大的元素减去平均数的值最大. 题解:找子集合的时候将整个几个分成2边, 左边为前i个数, 右边为最新插入的数. 那么我们就可以想到, 每次插入新的元素时, 对应最新这个元素的 ans值 的左边部分的个数不会少于前面那个i, 然后我们继续往右边走找到临界的位置就好了, 每次如果左边的值小于现在的平均值就能放入集合中. 代码 #incl…

题目链接: http://codeforces.com/contest/1139/problem/E 题意: 开始有$n$个同学和$m$,每个同学有一个天赋$p_{i}$和一个俱乐部$c_{i}$,然后在$d$天里,每天早上去除一名同学$k_{i}$,每天中午在每个俱乐部选一个人组成战队.战队的战斗力是最小的不存在的天赋,例如{1,2,3,0}战斗力是4,问每天战队的战斗力最大为多少. 数据范围: $1 \leq m \leq n \leq 5000$ $0 \leq p_i < 5000$ $…

Maximize Mex 离线之后把删数变成加数, 然后一边跑匈牙利一遍算答案. #include<bits/stdc++.h> #define LL long long #define fi first #define se second #define mk make_pair #define PLL pair<LL, LL> #define PLI pair<LL, int> #define PII pair<int, int> #define SZ(…

题目链接:http://codeforces.com/contest/939/problem/E E. Maximize! time limit per test3 seconds memory limit per test256 megabytes Problem Description You are given a multiset S consisting of positive integers (initially empty). There are two kind of quer…

E. Maximize! time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output You are given a multiset S consisting of positive integers (initially empty). There are two kind of queries: Add a positive int…

A. Nicholas and Permutation 题目链接:http://codeforces.com/contest/676/problem/A Nicholas has an array a that contains n distinct integers from 1 to n. In other words, Nicholas has a permutation of size n. Nicholas want the minimum element (integer 1) an…

B. Dinner with Emma 题目连接: http://www.codeforces.com/contest/616/problem/A Description Jack decides to invite Emma out for a dinner. Jack is a modest student, he doesn't want to go to an expensive restaurant. Emma is a girl with high taste, she prefer…

B. Pasha and Tea Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/557/problem/B Description Pasha decided to invite his friends to a tea party. For that occasion, he has a large teapot with the capacity of w milliliters and…

B. Ohana Cleans Up Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/554/problem/B Description Ohana Matsumae is trying to clean a room, which is divided up into an n by n grid of squares. Each square is initially either clea…

题目链接: http://codeforces.com/gym/100114 Description The computer network of “Plunder & Flee Inc.” consists of n servers and m two-way communication links. Two servers can communicate either through a direct link, or through a chain of links, by relayi…

D. Data Center Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/560/problem/B Description The startup "Booble" has shown explosive growth and now it needs a new data center with the capacity of m petabytes. Booble can b…

J. Computer Network Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100114 Description The computer network of “Plunder & Flee Inc.” consists of n servers and m two-way communication links. Two servers can communicate either thr…

C. Developing Skills Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/581/problem/C Description Petya loves computer games. Finally a game that he's been waiting for so long came out! The main character of this game has n dif…

http://codeforces.com/contest/373/problem/E E. Watching Fireworks is Fun time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output A festival will be held in a town's main street. There are n sectio…

  CodeForces 554B Time Limit:2000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u   Description Ohana Matsumae is trying to clean a room, which is divided up into an n by n grid of squares. Each square is initially either clean or dirty…

A. Ilya and Bank Account time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Ilya is a very clever lion, he lives in an unusual city ZooVille. In this city all the animals have their rights an…

codeforces 670A. Holidays 题目链接: http://codeforces.com/contest/670/problem/A 题意: A. Holidays On the planet Mars a year lasts exactly n days (there are no leap years on Mars). But Martians have the same weeks as earthlings — 5 work days and then 2 days…

// Codeforces #180 div2 C Parity Game // // 这个问题的意思被摄物体没有解释 // // 这个主题是如此的狠一点(对我来说,),不多说了这 // // 解决问题的思路: // // 第一个假设a字符串和b字符串相等,说直接YES // 假设b串全是0,直接YES // 注意到a串有一个性质,1的个数不会超过本身的加1. // a有个1的上限设为x,b有个1的个数设为y,则假设x < y // 那么直接NO. // // 如今普通情况下.就是模拟啦,找到a…

D. The Bakery time limit per test:2.5 seconds memory limit per test:256 megabytes input:standard input output:standard output Some time ago Slastyona the Sweetmaid decided to open her own bakery! She bought required ingredients and a wonder-oven whic…

A. Vicious Keyboard time limit per test:2 seconds memory limit per test:256 megabytes input:standard input output:standard output Tonio has a keyboard with only two letters, "V" and "K". One day, he has typed out a string s with only t…

A. Combination Lock time limit per test:2 seconds memory limit per test:256 megabytes input:standard input output:standard output Scrooge McDuck keeps his most treasured savings in a home safe with a combination lock. Each time he wants to put there…

A. Straight «A» time limit per test:1 second memory limit per test:256 megabytes input:standard input output:standard output Noora is a student of one famous high school. It's her final year in school — she is going to study in university next year.…

Description Polycarp is in really serious trouble — his house is on fire! It's time to save the most valuable items. Polycarp estimated that it would take tiseconds to save i-th item. In addition, for each item, he estimated the value of di — the mom…

A. Kyoya and Photobooks Kyoya Ootori is selling photobooks of the Ouran High School Host Club. He has 26 photos, labeled "a" to "z", and he has compiled them into a photo booklet with some photos in some order (possibly with some photo…

A. Vanya and Table   Vanya has a table consisting of 100 rows, each row contains 100 cells. The rows are numbered by integers from 1 to 100 from bottom to top, the columns are numbered from 1 to 100 from left to right. In this table, Vanya chose n re…