fork download
copy 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define int int64_t
  4. using vi = vector<int>;
  5. #define FOR(i, a, b) for (int i = (a); i < (b); i++)
  6. #define all(x) x.begin(), x.end()
  7.  
  8. signed main() {
  9. 	ios::sync_with_stdio(0); cin.tie(0);
  10. 	const int MX = 4e5 + 5;
  11. 	vi p(MX);
  12. 	FOR(i, 2, MX) if (!p[i]) for (int j = i; j < MX; j += i) p[j] = i;
  13. 	int t; cin >> t; for (int tt = 1; tt <= t; tt++) {
  14. 		int n; cin >> n;
  15. 		vi a(n); for (auto& i : a) cin >> i;
  16. 		int pr = -1;
  17. 		FOR(i, 0, n) if (p[a[i]] == a[i]) pr = a[i];
  18. 		cout << pr << endl;
  19. 		if (pr == -1) {
  20. 			cout << 2 << endl;
  21. 			continue;
  22. 		}
  23. 		int good = 1;
  24. 		FOR(i, 0, n) {
  25. 			if (a[i] == pr) continue;
  26. 			if (p[a[i]] == a[i]) good = 0;
  27. 			if (a[i] % 2 and a[i] - p[a[i]] < 2 * pr) good = 0;
  28. 			if (a[i] % 2 == 0 and a[i] < 2 * pr) good = 0;
  29. 		}
  30. 		if (good) cout << pr << endl;
  31. 		else cout << -1 << endl;
  32. 	}
  33. }
Success #stdin #stdout 0.01s 6164KB
comments (?)
stdin
copy 
1
4
214093 100957 216346 235564
stdout
copy 
100957
-1
https://ideone.com/QioNcZ
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!