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Repeated DNA Sequences

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Description

https://leetcode.com/problems/repeated-dna-sequences/description/

Naive Solution

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#define LENGTH 10
class Solution {
public:
    vector<string> findRepeatedDnaSequences(string s) {
        vector<string> ret;
        unordered_map<string, int> dict; 
        if (s.length() <= LENGTH) return ret;  
        for (int i = 0; i + 10 <= s.size(); i++) {
            string target(s.substr(i, LENGTH));
            if (dict[target] == 1) ret.push_back(target);
            dict[target] += 1;
        }
        return ret;
    }
    
};

[[1,0,0,1]

,[0,1,1,0],

[0,1,1,1],

[1,0,1,1]]

[0, 1, 1, 0]