func_code_string: #include <bits/stdc++.h>   using namespace std;   template <class T>   void show(const vector<T> &a) {     for (T x : a) cout << x <<    ;     cout <<   n ;   }   mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());   mt19937_64 rng_64(chrono::steady_clock::now().time_since_epoch().count());   vector<long long> xx = {1, 0, -1, 0};   vector<long long> yy = {0, 1, 0, -1};   string dir =  LRUD ;   const long long N = 3e5 + 50, oo = 2e18 + 500;   const long long mod = 998244353;   const long long M2 = 1000000093, x2 = 27162;   const long long M1 = 1000000087, x1 = 241;   const double eps = 1e-12, PI = 2 * acos(0.0);   long long n, m, k;   long long cnt = 0;   long long lg = 18;   vector<vector<long long>> g;   vector<vector<long long>> rg;   signed main() {     ios::sync_with_stdio(0);     cout.tie(0);     cin.tie(0);     string s;     cin >> s;     n = ((long long)(s.size()));     vector<vector<string>> vc(26);     for (long long i = 0; i < n; i++) {       string t = s.substr(i, n - i) + s.substr(0, i);       vc[s[i] -  a ].push_back(t);     }     double ans = 0;     for (long long i = 0; i < 26; i++) {       if (!((long long)(vc[i].size()))) continue;       long long val = 0;       for (long long j = 0; j < n; j++) {         vector<long long> count_letters(26);         for (long long z = 0; z < ((long long)(vc[i].size())); z++) {           count_letters[vc[i][z][j] -  a ]++;         }         bool fl = 1;         long long cur = 0;         for (long long z = 0; z < 26; z++) {           if (count_letters[z] == 1) {             cur++;           } else {             if (count_letters[z]) fl = 0;           }         }         if (fl) {           val = ((long long)(vc[i].size()));           break;         }         val = max(val, cur);         ;       }       cnt += val;     }     ans = (double)cnt / (double)n;     cout << fixed << setprecision(10) << ans;   }   