func_code_string: #include <bits/stdc++.h>   using namespace std;   int z[(int)1e6 + 3];   string z_algo(string s) {     int x = 0, y = 0;     int T = 0, M = (int)1e6 + 3;     for (int i = 1; i < s.size(); i++) {       z[i] = max(0, min(z[i - x], y - i + 1));       while (i + z[i] < s.size() && s[z[i]] == s[i + z[i]]) {         x = i, y = i + z[i];         z[i]++;       }     }     int maxz = 0, res = 0, n = s.size();     int ans = 0;     for (int i = 0; i < n; i++) {       if (i + z[i] == n && maxz >= z[i]) {         ans = max(ans, z[i]);       }       maxz = max(maxz, z[i]);     }     string t;     for (int i = 0; i < ans; i++) t.push_back(s[i]);     if (!ans) return  Just a legend ;     return t;   }   int main() {     int t, tc = 0;     string s, ans;     cin >> s;     ans = z_algo(s);     cout << ans << endl;     return 0;   }   