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JAVA大数....
Children’s Queue
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 10390 Accepted Submission(s): 3333
Problem Description There are many students in PHT School. One day, the headmaster whose name is PigHeader wanted all students stand in a line. He prescribed that girl can not be in single. In other words, either no girl in the queue or more than one girl stands side by side. The case n=4 (n is the number of children) is like
FFFF, FFFM, MFFF, FFMM, MFFM, MMFF, MMMM
Here F stands for a girl and M stands for a boy. The total number of queue satisfied the headmaster’s needs is 7. Can you make a program to find the total number of queue with n children?
Input There are multiple cases in this problem and ended by the EOF. In each case, there is only one integer n means the number of children (1<=n<=1000)
Output For each test case, there is only one integer means the number of queue satisfied the headmaster’s needs.
Sample Input
1
2
3
Sample Output
1
2
4
Author SmallBeer (CML)
Source 杭电ACM集训队训练赛（VIII）
import java.util.*;
import java.math.*;
public class Main
{
public static void main(String[] args)
{
Scanner cin=new Scanner(System.in);
BigInteger[] a=new BigInteger[1100];
a[1]=BigInteger.valueOf(1);
a[2]=BigInteger.valueOf(2);
a[3]=BigInteger.valueOf(4);
a[4]=BigInteger.valueOf(7);
for(int i=5;i<=1000;i++)
{
a[i]=a[i-4].add(a[i-2].add(a[i-1]));
}
while(cin.hasNextInt())
{
int n=cin.nextInt();
System.out.println(a[n]);
}
}
}
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