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class Solution { public: vector<int> process_lps(string s) { int j = 0, i = 1; vector<int> lps((int) s.size(), 0); lps[0] = 0; while(i < (int) s.size()) { if(s[i] == s[j]) { lps[i] = j + 1; i++; j++; } else { if(j != 0) { j = lps[j - 1]; } else { lps[i] = 0; i++; } } } return lps; } string longestPrefix(string s) { vector<int> v = process_lps(s); return s.substr(0, v[(int) v.size() - 1]); } };
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