codeforces 722D Generating Sets 【优先队列】
You are given a set Y of n distinct positive integers y1, y2, ..., yn.
Set X of n distinct positive integers x1, x2, ..., xn is said to generate set Y if one can transform X to Y by applying some number of the following two operation to integers in X:
- Take any integer xi and multiply it by two, i.e. replace xi with 2·xi.
- Take any integer xi, multiply it by two and add one, i.e. replace xi with 2·xi + 1.
Note that integers in X are not required to be distinct after each operation.
Two sets of distinct integers X and Y are equal if they are equal as sets. In other words, if we write elements of the sets in the array in the increasing order, these arrays would be equal.
Note, that any set of integers (or its permutation) generates itself.
You are given a set Y and have to find a set X that generates Y and the maximum element of X is mininum possible.
Input
The first line of the input contains a single integer n (1 ≤ n ≤ 50 000) — the number of elements in Y.
The second line contains n integers y1, ..., yn (1 ≤ yi ≤ 109), that are guaranteed to be distinct.
Output
Print n integers — set of distinct integers that generate Y and the maximum element of which is minimum possible. If there are several such sets, print any of them.
Examples
5
1 2 3 4 5
4 5 2 3 1
6
15 14 3 13 1 12
12 13 14 7 3 1
6
9 7 13 17 5 11
4 5 2 6 3 1
题意:如果你有一个原数列的话你可以对任何一个数字进行操作,令这个数字乘2或者乘2后在加1。现在给你一个目标数列,让你求一个原数列,这个原数列是所有可能的原数列当中最大的一个元素最小的那种。注意原数列和目标数列都必须满足set内元素的性质(即每个元素都不相同),但是在变化的过程中不需要满足这个条件。
思路:维护一个优先队列,把集合里的数都丢进去。最大的那个数除以二,查询是否与其他数重复。不重复,则此轮结束,继续下轮最大数除二做判断;重复,则继续除二,直到找到合适的或者一直找不到,后者结束,序列即为所求。这里有个要点,是最大数除二,能停则停,换个思路,一直除到底,会占据个位置,可能让比它更大的数没办法占位置,从而算法失败,测试例子最后一个即可以验证。
代码:
#include <iostream>
#include <cstdio>
#include <vector>
#include <queue>
#include <algorithm>
#include <set> #define LEN 50000 int n;
std::set<int> s; void input();
void work();
void output(); int main(){
input();
work();
output(); return ;
} void input(){
int tmp;
scanf("%d", &n);
for(int i=;i<n;i++){
scanf("%d", &tmp);
s.insert(tmp);
}
} void work(){
while(true){
std::set<int>::iterator it = s.end();it--;
int tmp = *it;
tmp >>= ;
while (s.find(tmp)!=s.end()){
tmp >>= ;
}
if (tmp){
s.erase(it);
s.insert(tmp);
}else{
break;
}
}
}
void output(){
std::set<int>::iterator it=s.begin();
printf("%d", *it);
for(it++;it!=s.end();it++){
printf(" %d", *it);
}
puts("");
}
codeforces 722D Generating Sets 【优先队列】的更多相关文章
- Codeforces 722D. Generating Sets
D. Generating Sets time limit per test 2 seconds memory limit per test 256 megabytes input standard ...
- Intel Code Challenge Elimination Round (Div.1 + Div.2, combined) D. Generating Sets 贪心+优先队列
D. Generating Sets time limit per test 2 seconds memory limit per test 256 megabytes input standard ...
- Intel Code Challenge Elimination Round (Div.1 + Div.2, combined) D. Generating Sets 贪心
D. Generating Sets 题目连接: http://codeforces.com/contest/722/problem/D Description You are given a set ...
- Generating Sets 贪心
H - Generating Sets Time Limit:2000MS Memory Limit:262144KB 64bit IO Format:%I64d & %I64 ...
- CF722D. Generating Sets[贪心 STL]
D. Generating Sets time limit per test 2 seconds memory limit per test 256 megabytes input standard ...
- [codeforces722D]Generating Sets
[codeforces722D]Generating Sets 试题描述 You are given a set Y of n distinct positive integers y1, y2, . ...
- D. Generating Sets 解析(思維)
Codeforce 722 D. Generating Sets 解析(思維) 今天我們來看看CF722D 題目連結 題目 略,請直接看原題 前言 真的是沒想到... @copyright petje ...
- 【53.57%】【codeforces 722D】Generating Sets
time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard o ...
- Codeforces 681C. Heap Operations 优先队列
C. Heap Operations time limit per test:1 second memory limit per test:256 megabytes input:standard i ...
随机推荐
- leetcode701
class Solution: def insertIntoBST(self, root, val): """ Time: O(log(n)) [average case ...
- VC中明明已经添加了头文件却还提示未定义的问题
我在VS中编译程序遇到这个错误:error C3861: 'ReadDirectoryChangesW': identifier not found, even with argument-depen ...
- Java快速开发平台,JEECG 3.7.6性能增强版本发布
JEECG 3.7.6 性能增强版本发布 导读 ⊙Vue SPA单页面应用 ⊙Datagrid标签实现不同风格切换,支持BootstrapTable.EasyUI ⊙灵活通用代码生成器工厂 ...
- APP-9.1-百度应用-文字识别
1.创建应用-文字识别 https://console.bce.baidu.com/ai/#/ai/ocr/app/list 尽量勾选:文字识别.百度语音.图像设别.人脸识别.图像搜索 2.获取Acc ...
- iOS app bundle id
每个app的bundle id是唯一的,不同开发者账号不能申请相同的bundle id,例如开发者账号B想用开发者A的bundle id,只能是开发者A将这个bundle id先删除,B才可以注册,否 ...
- sse 与 socket 摘录-推送常用技术
推送技术常用的集中实现的实现方式 01.短连接轮询 02.长轮询 03.iframe流: 04.WebSocket 05.Server-sent Events(sse)
- oracle第二天笔记
多表查询 /* 多表查询: 笛卡尔积: 实际上是两张表的乘积,但是在实际开发中没有太大意义 格式: select * from 表1,表2 */ select * from emp; select * ...
- linux mce的一些相关内容和用户态监控的设计方法
之所以想起写一点关于mce的东西,倒不是因为遇到mce的异常了,之前遇到过很多mce的异常,内存居多,但没有好好记录下来,写这个是因为参加2018 clk南京会议的一点想法. void __init ...
- rhel7磁盘管理
一.MBR主引导记录 MBR有512个字节,分为三个部分:第一部分446个字节,存储了引导分区:第二部分64字节为分区表:第三部分2个字节结束符:每个分区需16个字节,所以MBR的模式 ...
- iOS中的MVC
我们今天谈谈cocoa程序设计中的 模型-视图-控制器(MVC)范型.我们将从两大方面来讨论MVC: 什么是MVC? M.V.C之间的交流方式是什么样子的? 理解了MVC的概念,对cocoa程序开 ...