Solution: Flip Game
Learn to solve the Flip Game problem by identifying all possible states after flipping two consecutive '+' characters to '--'. Explore a backtracking approach that systematically generates valid next moves without modifying the original string. Understand the algorithm's time and space complexity while practicing key coding interview patterns.
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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 ...