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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	long long k;
  6. 	cin >> k;
  7. 	// b == k*a/(a-k) == k+k*k/(a-k)
  8. 	set< pair<long long,long long> > S;
  9. 	vector< pair<long long,int> > P;
  10. 	int k2 =k;
  11. 	for(int i =2; i*i <= k2; i++) if(k2%i == 0) {
  12. 		int x =0;
  13. 		while(k2%i == 0) {k2 /=i; x++;}
  14. 		P.push_back(make_pair(i,2*x));}
  15. 	if(k2 > 1) P.push_back(make_pair(k2,2));
  16. 	vector<long long> D(1,1);
  17. 	for(int i =0; i < P.size(); i++) {
  18. 		int N =D.size();
  19. 		for(int j =0; j < N; j++) {
  20. 			long long d =D[j];
  21. 			for(int l =1; l <= P[i].second; l++) {
  22. 				d *=P[i].first;
  23. 				D.push_back(d);}
  24. 			}
  25. 		}
  26. 	for(int i =0; i < D.size(); i++)
  27. 		S.insert(make_pair(k*k/D[i]+k,D[i]+k));
  28.  
  29. 	cout << S.size() << "\n";
  30. 	for(auto it =S.begin(); it != S.end(); it++) 
  31. 		cout << it->first << " " << it->second << "\n";
  32. 	return 0;}
Success #stdin #stdout 0s 3436KB
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https://ideone.com/QlXFdJ
SAU qual ACM 2014/15 C
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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