#R071C. [ARC071E] TrBBnsformBBtion
[ARC071E] TrBBnsformBBtion
Score : points
Problem Statement
Let us consider the following operations on a string consisting of A and B:
- Select a character in a string. If it is
A, replace it withBB. If it isB, replace withAA. - Select a substring that is equal to either
AAAorBBB, and delete it from the string.
For example, if the first operation is performed on ABA and the first character is selected, the string becomes BBBA.
If the second operation is performed on BBBAAAA and the fourth through sixth characters are selected, the string becomes BBBA.
These operations can be performed any number of times, in any order.
You are given two string and , and queries . For each query, determine whether , a substring of , can be made into , a substring of .
Constraints
- and consist of letters
AandB.
Input
Input is given from Standard Input in the following format:
Output
Print lines. The -th line should contain the response to the -th query. If can be made into , print YES. Otherwise, print NO.
BBBAAAABA
BBBBA
4
7 9 2 5
7 9 1 4
1 7 2 5
1 7 2 4
YES
NO
YES
NO
The first query asks whether the string ABA can be made into BBBA.
As explained in the problem statement, it can be done by the first operation.
The second query asks whether ABA can be made into BBBB, and the fourth query asks whether BBBAAAA can be made into BBB.
Neither is possible.
The third query asks whether the string BBBAAAA can be made into BBBA.
As explained in the problem statement, it can be done by the second operation.
AAAAABBBBAAABBBBAAAA
BBBBAAABBBBBBAAAAABB
10
2 15 2 13
2 13 6 16
1 13 2 20
4 20 3 20
1 18 9 19
2 14 1 11
3 20 3 15
6 16 1 17
4 18 8 20
7 20 3 14
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO