13 lines
342 B
Python
13 lines
342 B
Python
>>> from functools import lru_cache
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>>> @lru_cache(maxsize=4095)
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def ld(s, t):
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if not s: return len(t)
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if not t: return len(s)
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if s[0] == t[0]: return ld(s[1:], t[1:])
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l1 = ld(s, t[1:])
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l2 = ld(s[1:], t)
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l3 = ld(s[1:], t[1:])
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return 1 + min(l1, l2, l3)
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>>> print( ld("kitten","sitting"),ld("rosettacode","raisethysword") )
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3 8
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