Possible the shortest Python code?

  • 1
    class Solution:
        # @param {string} s
        # @return {string[]}
        def findRepeatedDnaSequences(self, s):
            dic = {}
            for i in xrange(len(s)-9):
                dic[s[i:i+10]] = dic.get(s[i:i+10], 0) + 1
            return [res for res in dic.keys() if dic[res]>1]

  • 0
    This post is deleted!

  • 0

    Not bad, but here's a shorter one:

    class Solution:
        def findRepeatedDnaSequences(self, s):
            d = {}, {}
            for i in range(len(s)-9):
                d[s[i:i+10] in d[0]][s[i:i+10]] = 1
            return list(d[1])

    Although I rewrote it like that just for comparison/shortness. Originally it looked like this:

    class Solution:
        def findRepeatedDnaSequences(self, s):
            once, twice = set(), set()
            for i in range(len(s) - 9):
                ss = s[i:i+10]
                [once, twice][ss in once].add(ss)
            return list(twice)

  • 0

    How about using a counter instead of a plain dict?

        ctr = collections.Counter()
        for i in range(len(s)-9):
        return [s for s in ctr if ctr[s]>1]

  • 0

    Might as well do it like this then:

        ctr = collections.Counter(s[i:i+10] for i in range(len(s)-9))

  • 0

    This is a pretty great solution. I want to ask if this solution or python language will have MLE problem?

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