func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s;     while (cin >> s) {       int N = s.size();       int l = N - 1;       for (; l > 0; --l) {         for (int i = 0; i + l <= N; ++i) {           string sub = s.substr(i, l);           size_t head = s.find(sub);           if (head != string::npos) {             size_t tail = s.find(sub, head + 1);             if (tail != string::npos) {               goto END;             }           }         }       }     END:;       cout << l << endl;     }     return 0;   }   