题目

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		//将十进制数M转化为N进制数
		Scanner sc = new Scanner(System.in);
		int m = sc.nextInt();
		int n = sc.nextInt();
		
		StringBuffer sb = new StringBuffer();//1
		String s = "0123456789ABCDEF";//2
		boolean f = false;//3

		//考虑十进制数字M是否为0
		if(m == 0) {
			sb.append('0');
		}else if(m<0) {
			m = -m;
			f = true;
		}
		
		while(m!=0) {
			sb.append(s.charAt(m%n));
			m/=n;
		}
		if(f) {
			sb.append("-");
		}
		System.out.println(sb.reverse().toString());		
	}
}