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1,2,3...9 这九个数字组成一个分数,其值恰好为1/3,如何组法?代码如下
/** * * @author Administrator * 类名:Main * 创建时间:2015-5-1 * vesion1.0 */ public class Main { public static void test(int[] x) { int a = x[0]*1000 + x[1]*100 + x[2]*10 + x[3]; int b = x[4]*10000 + x[5]*1000 + x[6]*100 + x[7]*10 + x[8]; if(a*3==b) System.out.println(a + " " + b); } public static void f(int[] x, int k) { if(k>=x.length){ test(x); return; } for(int i=k; i<x.length; i++){ { int t=x[k]; x[k]=x[i]; x[i]=t; } f(x,k+1); { int t=x[k]; x[k]=x[i]; x[i]=t; } } } public static void main(String[] args) { int[] x = {1,2,3,4,5,6,7,8,9}; f(x,0); } }
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原文地址:http://blog.csdn.net/wenzhilanyu2012/article/details/45418715