负数进制 - Problem

#22816. 负数进制

Statistics

负数进制与正数进制类似，但位权每隔一位为负。

七在正二进制中为 $111_2$。在负二进制中，位权使 $7$ 表示为 $11011_{-2}$，因为 $1\cdot16+1\cdot(-8)+0\cdot4+1\cdot(-2)+1=7$。

负数进制不用符号就能表示正、负整数。本题的负数进制表示不使用符号。请将普通整数转换为给定进制。

输入格式

一行两个整数 $N$ 和 $B$：$-30000\le N\le30000$ 是用 $10$ 进制表示的待转换数；新进制满足 $-10\le B\le-2$ 或 $2\le B\le10$。

输出格式

一行，包含 $N$ 的 $B$ 进制表示。

样例

输入格式 1

7 -2

输出格式 1

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