hdu 1406 完数(水)

http://acm.hdu.edu.cn/showproblem.php?pid=1406

/*2011-9-16author:BearFly1990*/package acm.hdu.tests;import java.io.BufferedInputStream;import java.util.Scanner;public class HDU_1406 {    private static Integer[] perfectNum={6,28,496,8128};    public static void main(String[] args) {        Scanner in = new Scanner(new BufferedInputStream(System.in));        while(in.hasNext()){            Integer t = in.nextInt();            while(t-- > 0){                Integer begin = in.nextInt();                Integer end = in.nextInt();                if(begin > end){                    int temp = begin;                    begin = end ;                    end = temp;                }                    // begin ^= end ^= begin ^= end;                Integer cnt = 0;                                for(int j = 0; j < 4; j++){                    if(begin <= perfectNum[j] && perfectNum[j] <= end){                        cnt++;                    }                }                                System.out.println(cnt);            }        }    }}