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AI Features

Solution: Flip Game

Understand how to solve the Flip Game problem by generating all valid next states from a string of pluses and minuses. Learn to apply backtracking techniques to enumerate possible moves, create new game states, and analyze the time and space complexities involved.

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:

  • 11 \leq currentState.length 500\leq 500

  • currentState[i] is either '+' or '-'

Solution

The main idea is to generate all possible valid next moves by ...