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Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 10525 Accepted Submission(s):
3483
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import java.math.BigDecimal;
import java.util.Scanner;
public class Main1250{
public static void main(String args[]){
Scanner cin=new Scanner(System.in);
BigDecimal []a=new BigDecimal[10007];
a[0]=new BigDecimal(1);
a[1]=new BigDecimal(1);
a[2]=new BigDecimal(1);
a[3]=new BigDecimal(1);
for(int i=4;i<10007;i++)
a[i]=a[i-1].add(a[i-2]).add(a[i-3]).add(a[i-4]);
while(cin.hasNext()){
int n=cin.nextInt();
System.out.println(a[n-1]);
}
}
}
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这个地方要注意数组要开大点,题目不是说只有2005个数
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原文地址:http://www.cnblogs.com/1314wamm/p/5679622.html