294. Flip Game II

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You are playing the following Flip Game with your friend: Given a string that contains only these two characters: + and -, you and your friend take turns to flip two consecutive "++" into "--". The game ends when a person can no longer make a move and therefore the other person will be the winner.
Write a function to determine if the starting player can guarantee a win.
Example:
Input: s = "++++"
Output: true 
Explanation: The starting player can guarantee a win by flipping the middle "++" to become "+--+".
Follow up:?Derive your algorithm‘s runtime complexity.


https://leetcode.com/problems/flip-game-ii/discuss/73954/Theory-matters-from-Backtracking(128ms)-to-DP-(0ms)

 

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