func_code_string: #include <bits/stdc++.h>   using namespace std;   int longestSubstring(string s) {     int i, j;     int l = s.length();     int maxi = 0;     map<string, int> mpp;     for (i = 0; i < l; i++) {       string temp =   ;       for (j = i; j < l; j++) {         temp += s[j];         mpp[temp]++;         maxi = max(maxi, mpp[temp]);       }     }     auto it = mpp.begin();     int len = 0;     string ans =   ;     while (it != mpp.end()) {       if (it->second >= 2) {         string temp = it->first;         if (temp.length() > len) {           ans = temp;           len = temp.length();         } else if (temp.length() == len) {           if (temp < ans) ans = temp;         }       }       it++;     }     return len;   }   int main() {     string s;     cin >> s;     int ans = longestSubstring(s);     cout << ans;   }   