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using namespace std; int main() { ios_base::sync_with_stdio(false); string s; cin >> s; int n = (int) s.size(); if(n <= 1000) { int res = 0; for(int i = 0; i < n; i++) { string tmp = ""; for(int j = i; j < n; j++) { tmp += s[j]; string rev_tmp = tmp; reverse(rev_tmp.begin(), rev_tmp.end()); string x = tmp + rev_tmp + tmp + rev_tmp; if(s.find(x) != string::npos) { res = max(res, (int) x.size()); } } } cout << res << endl; } return 0; }
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