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  1. #include <bits/stdc++.h>
  2. //#define int long long
  3. #define double long double
  4. #define fi first
  5. #define se second
  6. #define endl "\n"
  7. #define ii pair<int,int>
  8. #define iii pair<ii,int>
  9. using namespace std;
  10. const int mod=998244353;
  11. const int N=1e6+5;
  12. bool nt(int n){
  13. 	for (int i=2; i<=sqrt(n); ++i){
  14. 		if (n%i==0) return false;
  15. 	}
  16. 	return true;
  17. }
  18. signed main(){
  19. 	cin.tie(0)  -> sync_with_stdio(false);
  20. 	freopen("BAI1.INP","r",stdin);
  21. 	freopen("BAI1.OUT","w",stdout);
  22. 	string s; cin >> s;
  23. 	for (int i=0; i<s.size(); ++i){
  24. 		if (!isdigit(s[i])) s[i]=' ';
  25. 	}
  26. 	stringstream ss(s);
  27. 	int ans=0;
  28. 	while (ss >> s){
  29. 		if (s.size()>7) continue;
  30. 		else {
  31. 			int n=stoi(s);
  32. 			if (nt(n)) ans=max(ans,n);
  33. 		}
  34. 	}
  35. 	cout << ans;
  36. 	return 0; 
  37. }
  38.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/6bOGgP
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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