Introduction - If you have any usage issues, please Google them yourself
The initial state of the game, assuming that there is a sequence of letters, where any three adjacent letters are not exactly the same. After the game starts, you can add letters to any position of the sequence. Once the three or more identical letters are adjacent, the consecutive sub-columns are eliminated; if the newly generated sequence satisfies the elimination condition again after a cancellation, the elimination of the chain occurs until the resulting sequence no longer satisfies the elimination condition The After a single input, the new letters are not generated during the continuous elimination process; after the new letter sequence is stable, the next operation can be performed.