编程基础 - 题目

#7825. 编程基础

统计

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在学习“整数的二进制表示”这一主题时，计算机科学老师想出了下面这道题。给定两个整数 $N$ 和 $M$。请找出 $M$ 的二进制表示在 $N$ 的二进制表示中第一次出现的位置索引，假设两个二进制表示均不包含前导零。你能解决这个问题吗？

输入格式

在唯一的一行中包含两个由空格分隔的非负整数 $N$ 和 $M$，满足 $0 \leqslant M \leqslant N \leqslant 10^{19}$。

输出格式

在唯一的一行中输出一个整数，表示 $M$ 的二进制表示在 $N$ 的二进制表示中第一次出现的位置索引。最左侧位置的索引视为 $0$。如果不存在，则输出 $-1$。

样例

样例输入 1

6 2

样例输出 1

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