Curiosity Has No Limits
题意翻译
已知两个长度为n-1的整数序列a和b,序列中每个元素都在0到3之间(包含)。
试判断是否存在满足以下条件的长度为n的整数序列t, 如存在,则输出之:
- 对于1<=i<=n,ti在0到3之间(包含)
- 对于1<=i<=n-1,有ai=ti|ti+1,bi=ti&ti+1
#### 输入
共三行,第一行一个整数n(2<=n<=10^5),第二、三行各有n-1个整数,表示序列a和b。
#### 输出
如果不存在满足上述要求的t,则输出一行‘NO’。
如存在,则在第一行输出‘YES’,在第二行输出n
个整数,两个数之间用一个空格隔开,表示序列t。
题目描述
When Masha came to math classes today, she saw two integer sequences of length $ n - 1 $ on the blackboard. Let's denote the elements of the first sequence as $ a_i $ ( $ 0 \le a_i \le 3 $ ), and the elements of the second sequence as $ b_i $ ( $ 0 \le b_i \le 3 $ ).
Masha became interested if or not there is an integer sequence of length $ n $ , which elements we will denote as $ t_i $ ( $ 0 \le t_i \le 3 $ ), so that for every $ i $ ( $ 1 \le i \le n - 1 $ ) the following is true:
- $ a_i = t_i | t_{i + 1} $ (where $ | $ denotes the [bitwise OR operation](https://en.wikipedia.org/wiki/Bitwise_operation#OR)) and
- $ b_i = t_i \& t_{i + 1} $ (where $ \& $ denotes the [bitwise AND operation](https://en.wikipedia.org/wiki/Bitwise_operation#AND)).
The question appeared to be too difficult for Masha, so now she asked you to check whether such a sequence $ t_i $ of length $ n $ exists. If it exists, find such a sequence. If there are multiple such sequences, find any of them.
输入输出格式
输入格式
The first line contains a single integer $ n $ ( $ 2 \le n \le 10^5 $ ) — the length of the sequence $ t_i $ .
The second line contains $ n - 1 $ integers $ a_1, a_2, \ldots, a_{n-1} $ ( $ 0 \le a_i \le 3 $ ) — the first sequence on the blackboard.
The third line contains $ n - 1 $ integers $ b_1, b_2, \ldots, b_{n-1} $ ( $ 0 \le b_i \le 3 $ ) — the second sequence on the blackboard.
输出格式
In the first line print "YES" (without quotes), if there is a sequence $ t_i $ that satisfies the conditions from the statements, and "NO" (without quotes), if there is no such sequence.
If there is such a sequence, on the second line print $ n $ integers $ t_1, t_2, \ldots, t_n $ ( $ 0 \le t_i \le 3 $ ) — the sequence that satisfies the statements conditions.
If there are multiple answers, print any of them.
输入输出样例
输入样例 #1
4
3 3 2
1 2 0
输出样例 #1
YES
1 3 2 0
输入样例 #2
3
1 3
3 2
输出样例 #2
NO
说明
In the first example it's easy to see that the sequence from output satisfies the given conditions:
- $ t_1 | t_2 = (01_2) | (11_2) = (11_2) = 3 = a_1 $ and $ t_1 \& t_2 = (01_2) \& (11_2) = (01_2) = 1 = b_1 $ ;
- $ t_2 | t_3 = (11_2) | (10_2) = (11_2) = 3 = a_2 $ and $ t_2 \& t_3 = (11_2) \& (10_2) = (10_2) = 2 = b_2 $ ;
- $ t_3 | t_4 = (10_2) | (00_2) = (10_2) = 2 = a_3 $ and $ t_3 \& t_4 = (10_2) \& (00_2) = (00_2) = 0 = b_3 $ .
In the second example there is no such sequence.