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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. bool check(int n){
  4. 	if(n < 2) return false;
  5. 	for(int i = 2; i <= sqrt(n);++i){
  6. 		if(n % i == 0) return  false;
  7. 	}
  8. 	return true;
  9. }
  10. int main(){
  11. 	ios_base::sync_with_stdio(false);
  12. 	cin.tie(NULL);
  13. 	int n;
  14. 	cin >> n;
  15. 	if(check(n) == true){
  16. 		cout <<"1\n"<<n;
  17. 		return 0;
  18. 	}
  19. 	for(int i = n - 1; i >= 2;--i){
  20. 		if(check(i) == true){
  21. 				if(check(n-i) == true){
  22. 					cout <<"2\n"<<i <<" "<<n-i;
  23. 					return 0;
  24. 				}else{
  25. 					for(int j = 2; j < n- i;++j){
  26. 						if(check(j) == true && check(n-i-j) == true){
  27. 							cout <<"3\n"<<i <<" "<<j<<" " <<n-i-j;
  28. 							return 0;
  29. 					}
  30. 				}
  31. 			}
  32. 		}
  33. 	}
  34. }
Success #stdin #stdout 0s 5272KB
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https://ideone.com/MscHJK
language:
C++ (gcc 8.3)
created:
9 days ago
visibility:
public

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