http://acm.hdu.edu.cn/showproblem.php?pid=1316
大数,斐波那契数列
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
import java.io.*; import java.math.*; import java.util.*; import java.text.*; public class Main { public static void main(String[]args) { Scanner cin=new Scanner (new BufferedInputStream(System.in)); BigInteger a,b; BigInteger fiba,fibb; while(cin.hasNext()) { a=cin.nextBigInteger(); b=cin.nextBigInteger(); if(a.equals(BigInteger.valueOf(0)) && b.equals(BigInteger.valueOf(0))) break; int ans=0; fiba=BigInteger.valueOf(1); fibb=BigInteger.valueOf(2); while(true) { if(fiba.compareTo(a)>=0 && fiba.compareTo(b)<=0)ans++; if(fibb.compareTo(a)>=0 && fibb.compareTo(b)<=0)ans++; if(fiba.compareTo(b)>0 || fibb.compareTo(b)>0)break; fiba=fiba.add(fibb); fibb=fibb.add(fiba); } System.out.println(ans); } } }