LC.1221. Split a String in Balanced Strings

class Solution(object):
    def balancedStringSplit(self, s):
        """
        分别用l,r变量，记录L和R出现的次数，当l==r时可以分裂出去，然后重置l r即可
        """
        l, r, res = 0, 0, 0
        for char in s:
            if char == 'L':
                l += 1
            else:
                r += 1
            if l == r:
                res += 1
                l, r = 0, 0
        return res