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187.cpp
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187.cpp
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class Solution {
public:
int getEncodeBits(char c) {
if (c == 'A') return 0b00;
if (c == 'T') return 0b01;
if (c == 'C') return 0b10;
else return 0b11;
}
string encode2string(int encoded) {
string res;
for (int i = 0; i < 10; ++i) {
int k = encoded & 0b11;
if (k == 0b00) res.push_back('A');
else if (k == 0b01) res.push_back('T');
else if (k == 0b10) res.push_back('C');
else res.push_back('G');
encoded >>= 2;
}
reverse(res.begin(), res.end());
return res;
}
vector<string> findRepeatedDnaSequences(string s) {
vector<string> res;
int n = s.size();
if (n <= 10) return res;
int encoded = 0;
for (int i = 0; i < 9; ++i) {
encoded <<= 2;
encoded += getEncodeBits(s[i]);
}
unordered_map<int, int> mp;
for (int i = 9; i < n; ++i) {
encoded <<= 2;
encoded += getEncodeBits(s[i]);
mp[encoded]++;
encoded -= getEncodeBits(s[i - 9]) << 18;
}
for (auto& element : mp) {
if (element.second >= 2) {
res.push_back(encode2string(element.first));
}
}
return res;
}
};