POJ2413二分

来源：互联网发布：中超数据直播系统编辑：程序博客网时间：2024/06/06 10:39
注意二分，上界。
import java.beans.beancontext.BeanContext;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.PrintWriter;import java.io.StreamTokenizer;import java.math.BigInteger;import java.util.ArrayList;import java.util.Arrays;import java.util.Collections;import java.util.Comparator;import java.util.Scanner;import java.util.Stack;import java.util.StringTokenizer;public class Main{        public static void main(String[] args) throws IOException{                InputReader in = new InputReader(System.in) ;                StreamTokenizer cin = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));                PrintWriter out = new PrintWriter(System.out);                BigInteger f  ;                BigInteger f1 = BigInteger.valueOf(1) ;                BigInteger f2 = BigInteger.valueOf(2) ;                BigInteger up = BigInteger.valueOf(10).pow(100) ;                ArrayList<BigInteger> fibo = new ArrayList<BigInteger>() ;                fibo.add(f1) ;                 fibo.add(f2) ;                for( ; (f = f1.add(f2) ).compareTo(up) <= 0 ; ){                        fibo.add(f) ;                        f1 = f2 ;                        f2 = f  ;                }                fibo.add(f1.add(f2)) ;                for(;;){                      int t = 0 ;                      f1 = new BigInteger(in.next()) ;                      f2 = new BigInteger(in.next()) ;                      if(f1.compareTo(BigInteger.ZERO) == 0 && f2.compareTo(BigInteger.ZERO) == 0) break ;                      int l = 0 , r = fibo.size() - 1 , mid , lid = 0 , rid = 0 ;                      while(l <= r){                            mid = (l + r) >> 1 ;                            if(fibo.get(mid).compareTo(f1) >= 0){                                    lid = mid ;                                    r = mid - 1 ;                            }                            else l = mid + 1 ;                      }                      l = 0 ; r = fibo.size() - 1  ;                      while(l <= r){                            mid = (l + r) >> 1 ;                            if(fibo.get(mid).compareTo(f2) <= 0){                                    rid = mid ;                                    l = mid + 1 ;                            }                            else r = mid - 1 ;                      }                      out.println(rid - lid + 1) ; //out.flush() ;                }                    out.flush() ;        }}class InputReader {    public BufferedReader reader;    public StringTokenizer tokenizer;    public InputReader(InputStream stream) {        reader = new BufferedReader(new InputStreamReader(stream), 32768);        tokenizer = null;    }    public String next(){        while(tokenizer == null || !tokenizer.hasMoreTokens()){            try{                tokenizer = new StringTokenizer(reader.readLine());            }catch(IOException e){                throw new RuntimeException(e);            }        }        return tokenizer.nextToken();    }    public int nextInt() {        return Integer.parseInt(next());    }    public double nextDouble() {        return Double.parseDouble(next());    }}
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