藍橋杯第五屆真題：李白打酒

點擊查看：藍橋杯歷年真題 題解目錄

李白打酒

答案： 14

package java_2014_C;
public class Main006_李白打酒 {
    static int ans = 0;
    public static void main(String[] args) {
 		int r = 2;
	  	String s = "";
	  	f(r,s);
	  	System.out.println(ans);
    }
    private static void f(int r,String s) {
  	if(r==0 && s.length()==15) {
	    int count1=0,count2=0;
	    for(int i=0;i<15;i++) {
	    	if(s.charAt(i)=='a')  count1++;
	    	else count2++;
	     }
	    if(count1==5 && count2==10) {
	    	 ans++;
	    	    System.out.println(s);
	    }
	}else {
   	    if(r==0) return;
   	    if(s.length()>15) return;
            f(r*2, s+"a");
            f(r-1, s+"b");
  	}
    }
}