你一共找到了多少种方案?
全排列之后,筛选条件
*/public class hanJiaZuoYe { public static int total = 0; public static void swap(int[] str, int i, int j) { int temp ; temp = str[i]; str[i] = str[j]; str[j] = temp; } public static void arrange (int[] str, int st, int len) { if (st == len - 1) { if((str[1]+str[0]==str[2])&&(str[3]-str[4]==str[5])&&(str[6]*str[7]==str[8])&& (str[9]/str[10]==str[11])&&(str[9]%str[10]==0)){ for (int i = 0; i < len; i ++) { System.out.PRint(str[i]+ " "); } System.out.println(); total++; } } else { for (int i = st; i < len; i ++) { swap(str, st, i); arrange(str, st + 1, len); swap(str, st, i); } } } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub int str[] = {1,2,3,4,5,6,7,8,9,10,11,12,13}; arrange(str, 0, str.length); System.out.println(total); } }新闻热点
疑难解答