Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

The problem statement has recently been changed. View the changes.

×
G. Gates to Another World

time limit per test

4 secondsmemory limit per test

1024 megabytesinput

standard inputoutput

standard outputAs mentioned previously William really likes playing video games. In one of his favorite games, the player character is in a universe where every planet is designated by a binary number from $$$0$$$ to $$$2^n - 1$$$. On each planet, there are gates that allow the player to move from planet $$$i$$$ to planet $$$j$$$ if the binary representations of $$$i$$$ and $$$j$$$ differ in exactly one bit.

William wants to test you and see how you can handle processing the following queries in this game universe:

- Destroy planets with numbers from $$$l$$$ to $$$r$$$ inclusively. These planets cannot be moved to anymore.
- Figure out if it is possible to reach planet $$$b$$$ from planet $$$a$$$ using some number of planetary gates. It is guaranteed that the planets $$$a$$$ and $$$b$$$ are not destroyed.

Input

The first line contains two integers $$$n$$$, $$$m$$$ ($$$1 \leq n \leq 50$$$, $$$1 \leq m \leq 5 \cdot 10^4$$$), which are the number of bits in binary representation of each planets' designation and the number of queries, respectively.

Each of the next $$$m$$$ lines contains a query of two types:

block l r — query for destruction of planets with numbers from $$$l$$$ to $$$r$$$ inclusively ($$$0 \le l \le r < 2^n$$$). It's guaranteed that no planet will be destroyed twice.

ask a b — query for reachability between planets $$$a$$$ and $$$b$$$ ($$$0 \le a, b < 2^n$$$). It's guaranteed that planets $$$a$$$ and $$$b$$$ hasn't been destroyed yet.

Output

For each query of type ask you must output "1" in a new line, if it is possible to reach planet $$$b$$$ from planet $$$a$$$ and "0" otherwise (without quotation marks).

Examples

Input

3 3 ask 0 7 block 3 6 ask 0 7

Output

1 0

Input

6 10 block 12 26 ask 44 63 block 32 46 ask 1 54 block 27 30 ask 10 31 ask 11 31 ask 49 31 block 31 31 ask 2 51

Output

1 1 0 0 1 0

Note

The first example test can be visualized in the following way:

Response to a query ask 0 7 is positive.

Next after query block 3 6 the graph will look the following way (destroyed vertices are highlighted):

Response to a query ask 0 7 is negative, since any path from vertex $$$0$$$ to vertex $$$7$$$ must go through one of the destroyed vertices.

Codeforces (c) Copyright 2010-2021 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Oct/25/2021 08:24:49 (j2).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|