杭电oj--2031

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import java.util.Scanner;

public class Main {  public static void main(String[] args){   Scanner scanner = new Scanner(System.in);   char arr[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };   while (scanner.hasNext()) {    StringBuilder sb = new StringBuilder();    boolean flag = false;// 默认不是负数    int N = scanner.nextInt();    int R = scanner.nextInt();    if (N < 0) {     N = -N;     flag = true;    }    do {     sb.append(arr[N % R]);     N /= R;    } while (N != 0);    if(flag)     System.out.print("-");    System.out.println(sb.reverse());   }

 } }