类型：转载 责任编辑：asp.net 日期：2007/05/23
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正文内容：基本思路为，确定最长边的范围，对每一种情况求和，最后加以修正
import java.util.scanner;
import java.io.fileinputstream;
/**
* created by intellij idea.
* user: yu fan
* date: 2005-4-23
* time: 14:01:29
* to change this template use file | settings | file templates.
*/
public class b {
static scanner in;
static
{
try
{
system.setin(new fileinputstream("b.txt"));
in = new scanner(system.in);
}
catch(exception e)
{
e.printstacktrace();
}
}
public static void main(string[] arg) {
while(in.hasnext())
{
long q=in.nextlong();
long ans=in.nextlong();
long my=0;
long i;
if(q%3==0)
i=q/3;
else
i=q/3+1;
long p;
if(q%2==0)
p=q/2;
else
p=q/2+1;
my=(3*i+3*p-2*q-1)*(p-i)/4;
if((p-i)%4==0)
{
my+=(p-i)/4;
}
else if((p-i)%4==1)
{
if((3*i-q+1)%2==0)
{
my+=(p-i)/4;
}
else
{
my+=(p-i)/4+1;
}
}
else if((p-i)%4>=2)
{
my+=(p-i)/4+1;
}
/* 以上为下面循坏的级数求和
for(i=i;i<p;i++)
{
long k;
k=3*i-q+1;
if(k%2==1)
k=k/2+1;
else
k=k/2;
my+=k;
}
*/
if(my!=ans)
{
system.out.println("bad luck!");
}
else
{
system.out.println("congratulations!");
}
}
}
}