分割平衡字符串-贪心1221-python

没看答案，用两个变量need_R和need_L记录需要的R和L，当两者相等时即为一个平衡字符串，res+=1，两个变量归零。

class Solution:
    def balancedStringSplit(self, s: str) -> int:
        need_R = need_L = 0
        res = 0

        for ch in s:
            if ch == 'R':
                need_L += 1
            else:
                need_R += 1
            
            if need_R == need_L:
                res += 1
                need_R = need_L = 0

        return res