從m中取出n個全組合
阿新 • • 發佈:2019-02-20
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class mAn {
public static int count = 0;
public static void main(String[] args) {
String[] n ={“1”,”2”,”3”,”4”};
List lst = Arrays.asList(n);
take(“”, 4, lst);
System.out.println(count);
}
public static void take(String s, int total, List lst) { for (int i = 0; i < lst.size(); i++) { List tempList = new ArrayList(lst); String n = tempList.remove(i) + s; if(total == 1){ count ++; System.out.println(n); } else{ int temp = total - 1; take(n, temp, tempList); } } }
}