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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.     srand(time(0));
  17.     int step = 0;
  18.     string best;
  19.     for (int i = 5; i <= 50; ++i) {
  20.         for (int j = 1; j <= 1000; ++j) {
  21.             string s = "";
  22.             for (int k = 0; k < i; ++k) {
  23.                 int x = rand() % 9 + 1;
  24.                 s += to_string(x);
  25.             }
  26.             string tmp = s;
  27.             int li = 0;
  28.             while (tmp.size() > 1) {
  29.                 tmp = next(tmp);
  30.                 ++li;
  31.             }
  32.             if (li > step) {
  33.                 step = li;
  34.                 best = s;
  35.             }
  36.         }
  37.     }
  38.     cout << best << "\n";
  39.     cout << step << "\n";
  40. }
  41.  
Success #stdin #stdout 0.15s 5320KB
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39786878629
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https://ideone.com/DJkqEP
language:
C++14 (gcc 8.3)
created:
11 days ago
visibility:
public

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