cf287E Main Sequence
As you know, Vova has recently become a new shaman in the city of Ultima Thule. So, he has received the shaman knowledge about the correct bracket sequences. The shamans of Ultima Thule have been using lots of different types of brackets since prehistoric times. A bracket type is a positive integer. The shamans define a correct bracket sequence as follows:
- An empty sequence is a correct bracket sequence.
- If {a1, a2, ..., al} and {b1, b2, ..., bk} are correct bracket sequences, then sequence {a1, a2, ..., al, b1, b2, ..., bk} (their concatenation) also is a correct bracket sequence.
- If {a1, a2, ..., al} — is a correct bracket sequence, then sequence
also is a correct bracket sequence, where v (v > 0) is an integer.
For example, sequences {1, 1, - 1, 2, - 2, - 1} and {3, - 3} are correct bracket sequences, and {2, - 3} is not.
Moreover, after Vova became a shaman, he learned the most important correct bracket sequence {x1, x2, ..., xn}, consisting of n integers. As sequence x is the most important, Vova decided to encrypt it just in case.
Encrypting consists of two sequences. The first sequence {p1, p2, ..., pn} contains types of brackets, that is, pi = |xi| (1 ≤ i ≤ n). The second sequence {q1, q2, ..., qt} contains t integers — some positions (possibly, not all of them), which had negative numbers in sequence {x1, x2, ..., xn}.
Unfortunately, Vova forgot the main sequence. But he was lucky enough to keep the encryption: sequences {p1, p2, ..., pn} and {q1, q2, ..., qt}. Help Vova restore sequence x by the encryption. If there are multiple sequences that correspond to the encryption, restore any of them. If there are no such sequences, you should tell so.
The first line of the input contains integer n (1 ≤ n ≤ 106). The second line contains n integers: p1, p2, ..., pn (1 ≤ pi ≤ 109).
The third line contains integer t (0 ≤ t ≤ n), followed by t distinct integers q1, q2, ..., qt (1 ≤ qi ≤ n).
The numbers in each line are separated by spaces.
Print a single string "NO" (without the quotes) if Vova is mistaken and a suitable sequence {x1, x2, ..., xn} doesn't exist.
Otherwise, in the first line print "YES" (without the quotes) and in the second line print n integers x1, x2, ..., xn (|xi| = pi; xqj < 0). If there are multiple sequences that correspond to the encrypting, you are allowed to print any of them.
2
1 1
0
YES
1 -1
4
1 1 1 1
1 3
YES
1 1 -1 -1
3
1 1 1
0
NO
4
1 2 2 1
2 3 4
YES
1 2 -2 -1
题意是有1e9种括号,每种括号的左括号用k表示,右括号用-k表示,现在给出个序列,其中已知一些括号是右括号,可以再把一些左括号变右括号(正数取反)要找到一种括号匹配的方式
从后往前找,维护一个栈,如果当前的括号跟栈顶的匹配就马上匹配,否则改负号扔进栈里去。
如果当前这个括号跟栈顶的匹配,而你又选择不匹配的话,那么这个括号和栈顶都要分别再和后面的某个相同的括号匹配。
如果再后面的括号也真的存在,那么完全可以当前的和栈顶匹配,后面的自己匹配,所以当前和栈顶匹配这里也是可行的。如果后面的不存在,这样无解,只能当前的和栈顶匹配。所以当前的跟栈顶的能匹配就匹配。
#include<cstdio>
#include<iostream>
#include<cstring>
#include<cstdlib>
#include<algorithm>
#include<cmath>
#include<queue>
#include<deque>
#include<set>
#include<map>
#include<ctime>
#define LL long long
#define inf 0x7ffffff
#define pa pair<int,int>
#define mkp(a,b) make_pair(a,b)
#define pi 3.1415926535897932384626433832795028841971
using namespace std;
inline LL read()
{
LL x=,f=;char ch=getchar();
while(ch<''||ch>''){if(ch=='-')f=-;ch=getchar();}
while(ch>=''&&ch<=''){x=x*+ch-'';ch=getchar();}
return x*f;
}
int n,m;
int a[];
int zhan[],top;
int main()
{
n=read();
for (int i=;i<=n;i++)a[i]=read();
m=read();
for (int i=;i<=m;i++)a[read()]*=-;
for (int i=n;i>=;i--)
{
if (a[i]<)zhan[++top]=i;
else if (top&&a[i]+a[zhan[top]]==)top--;
else if (top&&a[i]==a[zhan[top]])a[i]*=-,top--;
else a[i]*=-,zhan[++top]=i;
}
if (top)puts("NO");
else {puts("YES");for (int i=;i<=n;i++)printf("%d ",a[i]);}
}
cf 287E
cf287E Main Sequence的更多相关文章
- [CF286C] Main Sequence
问题描述 定义幸运数列: 空数列是幸运数列 如果 S 是幸运数列,那么 {r, S, -r} 也是幸运数列 (r > 0) 如果 S 和 T 都是幸运数列,那么 {S, T} 也是幸运数列 给定 ...
- 「CF286C」Main Sequence
传送门 Luogu 解题思路 看到正负号相互抵消,很容易联想到括号匹配和栈. 但由于题目钦定了一些位置只能是负数,所以我们可以这样考虑: 把负数视为右括号,正数视为左括号,然后开一个栈,从右往左遍历, ...
- MyEclipse常用插件使用教程
一.Findbugs 1. 配置 1.1 打开FindBugs视图: Windows => Show View => Other… => FindBugs => Bug Inf ...
- java 代码分析工具——JDepend
最近学习Mybatis的官方文档,看到了[项目文档]一节有很多内容没有见过,做个笔记,理解一下. 百科上的介绍,我竟然都看懂了,那就不找其他地方的资料了. JDepend 一个开放源代码的可以用来评价 ...
- [设计模式] 7 适配器模式 adapter
在 Adapter 模式的结构图中可以看到,类模式的 Adapter 采用继承的方式复用 Adaptee的接口,而在对象模式的 Adapter 中我们则采用组合的方式实现 Adaptee 的复用 类模 ...
- 设计模式 --> (5)适配器模式
适配器模式 适配器模式把一个类的接口变换成客户端所期待的另一种接口,从而使原本接口不匹配而无法在一起工作的两个类能够在一起工作.比如说我的hp笔记本,美国产品,人家美国的电压是110V的,而我们中国的 ...
- 论文阅读笔记五十二:CornerNet-Lite: Efficient Keypoint Based Object Detection(CVPR2019)
论文原址:https://arxiv.org/pdf/1904.08900.pdf github:https://github.com/princeton-vl/CornerNet-Lite 摘要 基 ...
- CHtmlEditCtrl (3): More HTML Editor Options
In this version of our HTML Editor, we'll create a floating source view/edit window and we'll implem ...
- Java静态检测工具/Java代码规范和质量检查简单介绍(转)
静态检查: 静态测试包括代码检查.静态结构分析.代码质量度量等.它可以由人工进行,充分发挥人的逻辑思维优势,也可以借助软件工具自动进行.代码检查代码检查包括代码走查.桌面检查.代码审查等,主要检查代码 ...
随机推荐
- (转)SpringMVC学习(五)——SpringMVC的参数绑定
http://blog.csdn.net/yerenyuan_pku/article/details/72511611 SpringMVC中的参数绑定还是蛮重要的,所以单独开一篇文章来讲解.本文所有案 ...
- HDU 4341 Gold miner (分组背包)
先把线按照距离原点的距离排序,然后用叉积把在同一条直线上的点放在一起, 把在同一条线上的点中的前i个点当成一个点就转化成了分组背包. 写if(kas++) putchar('\n') 居然PE了,PE ...
- MIPS——循环语句
有关指令 add $t1,$t2,$t3 #寄存器+寄存器,$t1 = $t2 + $t3 add $t1,$t2,immediate #寄存器+立即数,$t1 = $t2 + immediate b ...
- js 控制台输出
var a = 'string'; var b = 123; console.log("The %s jumped over %d tall buildings", a, b); ...
- python常用模块之json和pickle模块
json模块 json.dumps 将 Python 对象编码成 JSON 字符串 json.loads 用于解码 JSON 数据.该函数返回 Python 字段的数据类型. pi ...
- tomcat常用的优化和配置
Tomcat 5常用优化和配置 1.JDK内存优化: Tomcat默认可以使用的内存为128MB,Windows下,在文件{tomcat_home}/bin/catalina.bat,Unix下,在文 ...
- iOS开发遇到的坑之四--图片命名不规范
最近上手并主导一个小项目的研发,在开发地图模块的时候,UI切图给我们使用,他给的图片命名是1.1.1.png 1.1.2.png 1.1.3.png 我也没有多看,就直接打包发给小组成员叫他添加到Im ...
- 牛客网NOIP赛前集训营-提高组(第三场)A 管道维修
https://www.nowcoder.com/acm/contest/174/A 这个的话 一个位置被清理的时间就是它到空白格子/边界的最短路对吧qww 然后求期望的话 假设它在第i步被清理掉的 ...
- Mac OS 终端强化美化:iterm2 + zsh + oh~my~zsh 设置教程
为了获得更好的排版效果,文章改用markdown撰写,故重发一次. 前言 mac自带的terminal终端没有文件名高亮等功能,而且界面不是很好看,故今晚学舍友折腾了终端,可以让自己使用起来更加方便, ...
- svn设置提交时忽略某些文件
一.在资源管理器中,右键一个未加入版本控制文件或目录,并从弹出菜单选择TortoiseSVN →Add to Ignore List,会出现一个子菜单,允许你仅选择该文件或者所有具有相同后缀的文件. ...