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#include <iostream> #include <vector> #include <algorithm> using namespace std; int main() { ios_base::sync_with_stdio(false); string A, B; int repeat; cin >> A >> B >> repeat; string s = ""; for(int i = 0; i < repeat; i++) { s += A; if(A.size() > 0) { A.erase(A.end() - 1); } } vector<bool> alpha(26, false); for(int i = 0; i < B.size(); i++) { alpha[B[i] - 'a'] = true; } int result = 0; for(int i = 0; i < s.size(); i++) { int sum = 0; for(int j = i; j < s.size(); j++) { sum += alpha[s[j] - 'a']; result += sum; } } cout << result << endl; return 0; }
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