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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. bool check(string s){
  4.     for(char c:s)
  5.         if (c=='0') return true;
  6.     return false;
  7. }
  8. string next(string s){
  9.     if (check(s)) return "0";
  10.     long long tich = 1;
  11.     for (char c:s)
  12.         tich *=(c -'0');
  13.     return to_string(tich);
  14. }
  15. int main(){
  16. 	ios_base::sync_with_stdio(false);
  17. 	cin.tie(NULL);
  18.     int ans = 0;
  19.     string maxi;
  20.     for (int i = 1; i <= 50; ++i){
  21.         for (int j = 1; j <= 1000; ++j){
  22.             string s = "";
  23.             for (int k = 0; k < i; ++k){
  24.                 int x = rand() % 9 + 1;
  25.                 s += to_string(x);
  26.             }
  27.             string tmp = s;
  28.             int li = 0;
  29.             while (tmp.size() > 1){
  30.                 tmp = next(tmp);
  31.                 ++li;
  32.             }
  33.             if (li >ans){
  34.                 ans = li;
  35.                 maxi = s;
  36.             }
  37.         }
  38.     }
  39.     cout << maxi << "\n";
  40.     cout << ans << "\n";
  41. }
  42.  
Success #stdin #stdout 0.15s 5320KB
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73686887299
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https://ideone.com/QmUEg5
language:
C++14 (gcc 8.3)
created:
12 days ago
visibility:
public

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