Solution: Flip Game
Explore how to solve the Flip Game using backtracking by enumerating all valid next states after flipping two consecutive '+' characters into '--'. This lesson guides you through implementing the solution with string slicing and explains the time and space complexities involved.
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Statement
You are playing a Flip Game with a friend.
You are given a string currentState consisting only of the characters '+' and '-'. Players take turns flipping two consecutive "++" into "--". The game ends when a player cannot make a move, at which point the other player wins.
Return all possible states of currentState after performing exactly one valid move. The answer may be returned in any order. If no valid move exists, return an empty list.
Constraints:
currentState.lengthcurrentState[i]is either'+'or'-'
Solution
The main idea is to generate all possible valid next moves by ...