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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. string s;
  4. int dem = 0;
  5. long long n = 0, kq = 0;
  6. bool so = false;
  7. bool snt(long long n)
  8. {
  9.     if (n < 2) return false;
  10.     if (n == 2 || n == 3) return true;
  11.     if (n % 2 == 0 || n % 3 == 0) return false;
  12.     for (long long i = 5; i * i <= n; i += 6)
  13.     {
  14.         if (n % i == 0 || n % (i + 2) == 0)
  15.             return false;
  16.     }
  17.     return true;
  18. }
  19. int main()
  20. {
  21.     ios::sync_with_stdio(0);
  22.     cin.tie(0);
  23.     freopen("NTMAX.INP", "r", stdin);
  24.     freopen("NTMAX.OUT", "w", stdout);
  25.     getline(cin, s);
  26.     for (char c : s)
  27.     {
  28.         if (isdigit(c))
  29.         {
  30.             n = n * 10 + (c - '0');
  31.             dem++;
  32.             so = true;
  33.         }
  34.         else
  35.         {
  36.             if (so && snt(n))
  37.                 kq = max(kq, n);
  38.             n = 0;
  39.             so = false;
  40.         }
  41.     }
  42.     if (so && snt(n))
  43.         kq = max(kq, n);
  44.     cout << dem << '\n' << kq;
  45.     return 0;
  46. }
Success #stdin #stdout 0s 5324KB
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https://ideone.com/ZpzD0g
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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