CodeForces 146A Lucky Ticket
Time Limit:2000MS Memory Limit:262144KB 64bit IO Format:%I64d & %I64u
Description
Petya loves lucky numbers very much. Everybody knows that lucky numbers are positive integers whose decimal record contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not.
Petya loves tickets very much. As we know, each ticket has a number that is a positive integer. Its length equals n (n is always even). Petya calls a ticket lucky if the ticket's number is a lucky number and the sum of digits in the first half (the sum of the first n / 2 digits) equals the sum of digits in the second half (the sum of the last n / 2 digits). Check if the given ticket is lucky.
Input
The first line contains an even integer n(2 ≤ n ≤ 50) — the length of the ticket number that needs to be checked. The second line contains an integer whose length equals exactly n — the ticket number. The number may contain leading zeros.
Output
On the first line print "YES" if the given ticket number is lucky. Otherwise, print "NO" (without the quotes).
Sample Input
2
47
NO
4
4738
NO
4
4774
YES
Hint
In the first sample the sum of digits in the first half does not equal the sum of digits in the second half (4 ≠ 7).
In the second sample the ticket number is not the lucky number.
#include <stdio.h>
#include <string.h>
#include <algorithm>
using namespace std;
int main()
{
char a[];
int i,j,n;
while(scanf("%d",&n)!=EOF)
{
int flg=,s1=,s2=;
scanf("%s",a);
for(i=;i<n;i++)
{
if(i<n/)
s1=s1+a[i]-'';
else
s2=s2+a[i]-'';
if(a[i]=='' || a[i]=='')
{
flg=;
}
else
{
flg=;
break;
}
}
//printf("%d %d\n",s1,s2);
if(s1!=s2)
flg=;
if(flg)
printf("YES\n");
else
printf("NO\n");
}
return ;
}
最新文章
- Linux服务器(Ubuntu14.04)添加远程连接VNC Server
- yate: windows下源码下载,配置,编译
- java内功 ---- jvm虚拟机原理总结,侧重于GC
- django前端到后端一次简单完整的请求实例
- java新手笔记21 接口
- 【数据压缩】LZ78算法原理及实现
- openwrt的编译环境
- vim7.3中文乱码问题
- (NO.00001)iOS游戏SpeedBoy Lite成形记(二十二)
- GoLang-Beego使用
- 编译原理---antlr实践+编译过程理解+课程理解知识点
- Django_创建项目
- 如果redis没有设置expire,他是否默认永不过期?
- 21 python的魔法方法(转)
- ida 调试 android fork
- zzw原创_根据某一文件复制出大量固定位数后缀名的递增的文件
- ios中radiobutton
- 使用JS实现2048小游戏
- .NET-MVC站点部署到windows server2008r2服务器404错误
- php注册审查