博客
关于我
【读入】#36 A. Extra-terrestrial Intelligence
阅读量:201 次
发布时间:2019-02-28

本文共 1991 字,大约阅读时间需要 6 分钟。

A. Extra-terrestrial Intelligence
time limit per test
2 seconds
memory limit per test
64 megabytes
input
input.txt
output
output.txt

Recently Vasya got interested in finding extra-terrestrial intelligence. He made a simple extra-terrestrial signals’ receiver and was keeping a record of the signals for n days in a row. Each of those n days Vasya wrote a 1 in his notebook if he had received a signal that day and a 0 if he hadn’t. Vasya thinks that he has found extra-terrestrial intelligence if there is a system in the way the signals has been received, i.e. if all the intervals between successive signals are equal. Otherwise, Vasya thinks that the signals were sent by some stupid aliens no one cares about. Help Vasya to deduce from the information given by the receiver if he has found extra-terrestrial intelligence or not.

Input

The first line contains integer n (3 ≤ n ≤ 100) — amount of days during which Vasya checked if there were any signals. The second line contains n characters 1 or 0 — the record Vasya kept each of those n days. It’s guaranteed that the given record sequence contains at least three 1s.

Output

If Vasya has found extra-terrestrial intelligence, output YES, otherwise output NO.

Sample test(s)
input
800111000
output
YES
input
71001011
output
NO
input
71010100
output
YES
这道题……我太蠢了,真的太蠢了……我一直wa了7次,就因为我看到这个是数字然后用%d来读……全都读完了……

改成%c即AC……

这道题的意思是在10序列中看1的位置是否等距,所以使用flag记录第一个和第二个出现的1,获得步长pace,然后如果之后1不是按照pace的步长出现,即为NO,读完即为YES

#include 
#include
#include
#include
using namespace std;int main(){ int n,pace=0,p=0; int first=0,flag=0; freopen("input.txt","r",stdin); freopen("output.txt","w",stdout); cin>>n; char c; scanf("%c",&c); for(int i=1;i<=n;i++) { scanf("%c",&c); if(flag==0) { if(c=='1')flag=1; else; } else if(flag==1) { if(c=='1')flag=2; else pace++; } else { if(c=='1') { if(p!=pace) { puts("NO"); return 0; } else p=0; } else p++; } } puts("YES"); return 0;}

转载地址:http://yjwi.baihongyu.com/

你可能感兴趣的文章
Multicast1
查看>>
MySQL Cluster 7.0.36 发布
查看>>
Multimodal Unsupervised Image-to-Image Translation多通道无监督图像翻译
查看>>
multipart/form-data与application/octet-stream的区别、application/x-www-form-urlencoded
查看>>
mysql cmake 报错,MySQL云服务器应用及cmake报错解决办法
查看>>
Multiple websites on single instance of IIS
查看>>
mysql CONCAT()函数拼接有NULL
查看>>
multiprocessing.Manager 嵌套共享对象不适用于队列
查看>>
multiprocessing.pool.map 和带有两个参数的函数
查看>>
MYSQL CONCAT函数
查看>>
multiprocessing.Pool:map_async 和 imap 有什么区别?
查看>>
MySQL Connector/Net 句柄泄露
查看>>
multiprocessor(中)
查看>>
mysql CPU使用率过高的一次处理经历
查看>>
Multisim中555定时器使用技巧
查看>>
MySQL CRUD 数据表基础操作实战
查看>>
multisim变压器反馈式_穿过隔离栅供电:认识隔离式直流/ 直流偏置电源
查看>>
mysql csv import meets charset
查看>>
multivariate_normal TypeError: ufunc ‘add‘ output (typecode ‘O‘) could not be coerced to provided……
查看>>
MySQL DBA 数据库优化策略
查看>>