class Solution(object):
def isScramble(self, s1, s2):
"""
:type s1: str
:type s2: str
:rtype: bool
"""
if s1==s2: return True
l1=len(s1)
l2=len(s2)
d=[[[False for n in xrange(l1+1)]for j in xrange(l2)]for i in xrange(l1)]
for i in xrange(l1):
for j in xrange(l2):
if s1[i]==s2[j]:
d[i][j][1]=True
for n in xrange(2,l1+1):
for i in xrange(l1-n+1):
for j in xrange(l2-n+1):
for k in xrange(1,n):
if ((d[i][j][k] and d[i+k][j+k][n-k]) or (d[i][j+n-k][k] and d[i+k][j][n-k])):
d[i][j][n]=True
return d[0][0][l1]
87. Scramble String
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