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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. class Solver {
  5. private:
  6. 	bool isPrime(int n) {
  7. 		if (n <= 1) return false;
  8. 		for (int i = 2; i * i <= n; i++) {
  9. 			if (n % i == 0) 
  10. 				return false;
  11. 		}
  12. 		return true;
  13. 	}
  14.  
  15. 	bool isValidNum(int num) {
  16. 		return num % 10 == 1 || num % 10 == 9;
  17. 	}
  18. public:
  19. 	int getSumInRange(int l, int r) {
  20. 		if (l > r) swap(l, r);
  21.  
  22. 		int sum = 0;
  23. 		for (int i = l; i <= r; i++) {
  24. 			if (isValidNum(i)) {
  25. 				sum += isPrime(i) ? i : 0;
  26. 			}
  27. 		}
  28. 		return sum;
  29. 	}
  30. };
  31.  
  32. int32_t main() {
  33. 	Solver* solver = new Solver();
  34. 	cout << solver->getSumInRange(100, 200) << endl;
  35. }
Success #stdin #stdout 0.01s 5304KB
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https://ideone.com/9LYXqD
language:
C++14 (gcc 8.3)
created:
11 hours ago
visibility:
public

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