ni

class Solution(object):
    def isScramble(self, s1, s2):
        """
        :type s1: str
        :type s2: str
        :rtype: bool
        """
        # NULL
        n=len(s1)
        if n==0:
            return 1
        if n==1:
            return s1==s2
        for i in range(n):
            # core-->length==i
            return (self.isScramble(s1[:i],s2[:i]) and self.isScramble(s1[i:],s2[i:])) or (self.isScramble(s1[:i], s2[-i:]) and self.isScramble(s1[-i:], s2[:i]))

solu=Solution()
# 赋值输出一条龙

print(solu.isScramble(s1 = "abcde", s2 = "caebd"))
print(solu.isScramble(s1 = "great", s2 = "rgeat"))