func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize( O3,unroll-loops )   #pragma pack(0)   using namespace std;   vector<string> v[1000001];   string s;   int ptr = 0, maxd = 0;   void dfs(int dis) {     maxd = max(maxd, dis);     int k = 0, f = ptr;     for (; ptr < s.length(); ptr++)       if (s[ptr] ==  , ) break;     string t = s.substr(f, ptr - f);     ptr++;     for (; ptr < s.length(); ptr++) {       if (s[ptr] ==  , ) break;       k = k * 10 + (s[ptr] -  0 );     }     ptr++;     v[dis].emplace_back(t);     for (int i = 1; i <= k; i++) dfs(dis + 1);   }   signed main() {     ios::sync_with_stdio(0), cin.tie(0);     cin >> s;     while (ptr < s.length()) dfs(0);     cout << maxd + 1 <<   n ;     for (int i = 0; !v[i].empty(); i++) {       for (auto j : v[i]) cout << j <<    ;       cout <<   n ;     }   }   