There is a test case missing in this problem, please add it A.S.A.P


  • 1
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    Using the following C++ solution test it.

    class Solution {
    public:
        vector<string> findRepeatedDnaSequences(string s) 
        {
            int sLen = s.length();
            vector<string> v;
            if(sLen < 11) return v;
            char keyMap[1<<21]{0};
            int hashKey = 0;
            for(int i = 0; i < 9; ++i) hashKey = (hashKey<<2) | (s[i]-'A'+1)%5;
            for(int i = 9; i < sLen; ++i)
            {
                if(keyMap[hashKey = ((hashKey<<2)|(s[i]-'A'+1)%5)&0xfffff]++ == 1)
                    v.push_back(s.substr(i-9, 10));
            }
            return v;
        }
    };
    

    In this solution the keyMap is using char as counter but it's easily overflowed when test case like this I pointed out above. So as a result, we should use map instead of array here though it's less efficient - since array of int will encounter CE or MLE. But if not, after the OJ upgraded, we should use int [] to accelerate here.


  • 0

    Thanks! I have added the test case.


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