For this Question: The DNA sequence is composed of a series of nucleotides abbreviated as 'A', 'C', 'G', and 'T'.
For example, "ACGAATTCCG" is a DNA sequence.
When studying DNA, it is useful to identify repeated sequences within the DNA.
Given a string s that represents a DNA sequence, return all the 10-letter long sequences (substrings) that occur more than once in a DNA molecule. You may return the answer in any order. This is a functional problem you have to complete the solve function.The first line of the input contains the string s.

<b>Constraints</b>
1 <= s. length() <= 1e5
s[i] is either 'A', 'C', 'G', or 'T'Complete the function and return the relevant strings.Sample Input:-
GGGGGGGGGGGGG

Sample Output:- 
GGGGGGGGGG, I have written this Solution Code: vector<string> solve(string &s) {
    string res = "";
    for (int i = 0; i < 10; i++) {
        res += s[i];
    }
    unordered_map<string, int> freq;
    freq[res] += 1;
    for (int i = 10; i < s.length(); i++) {
        res.erase(res.begin());
        res += s[i];
        freq[res] += 1;
    }
    vector<string> result;
    for (auto &it : freq) {
        if (it.second > 1) {
            result.push_back(it.first);
        }
    }
    return result;
}, In this Programming Language: C++, Now tell me if this Code is compilable or not?