A14669. Reverse
编程题
普及/提高-
知识点
题目描述
You are given two positive integers $x$ and $y$ . You can perform the following operation with $x$ : write it in its binary form without leading zeros, add $0$ or $1$ to the right of it, reverse the binary form and turn it into a decimal number which is assigned as the new value of $x$ .
For example:
- $34$ can be turned into $81$ via one operation: the binary form of $34$ is $100010$ , if you add $1$ , reverse it and remove leading zeros, you will get $1010001$ , which is the binary form of $81$ .
- $34$ can be turned into $17$ via one operation: the binary form of $34$ is $100010$ , if you add $0$ , reverse it and remove leading zeros, you will get $10001$ , which is the binary form of $17$ .
- $81$ can be turned into $69$ via one operation: the binary form of $81$ is $1010001$ , if you add $0$ , reverse it and remove leading zeros, you will get $1000101$ , which is the binary form of $69$ .
- $34$ can be turned into $69$ via two operations: first you turn $34$ into $81$ and then $81$ into $69$ .
Your task is to find out whether $x$ can be turned into $y$ after a certain number of operations (possibly zero).
For example:
- $34$ can be turned into $81$ via one operation: the binary form of $34$ is $100010$ , if you add $1$ , reverse it and remove leading zeros, you will get $1010001$ , which is the binary form of $81$ .
- $34$ can be turned into $17$ via one operation: the binary form of $34$ is $100010$ , if you add $0$ , reverse it and remove leading zeros, you will get $10001$ , which is the binary form of $17$ .
- $81$ can be turned into $69$ via one operation: the binary form of $81$ is $1010001$ , if you add $0$ , reverse it and remove leading zeros, you will get $1000101$ , which is the binary form of $69$ .
- $34$ can be turned into $69$ via two operations: first you turn $34$ into $81$ and then $81$ into $69$ .
Your task is to find out whether $x$ can be turned into $y$ after a certain number of operations (possibly zero).
输入格式
The only line of the input contains two integers $x$ and $y$ ( $1 \le x, y \le 10^{18}$ ).
输出格式
Print YES if you can make $x$ equal to $y$ and NO if you can't.
输入输出样例
输入 #1
3 3
输出 #1
YES
输入 #2
7 4
输出 #2
NO
输入 #3
2 8
输出 #3
NO
输入 #4
34 69
输出 #4
YES
输入 #5
8935891487501725 71487131900013807
输出 #5
YES
说明/提示
In the first example, you don't even need to do anything.
The fourth example is described in the statement.
The fourth example is described in the statement.