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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. unordered_map<int, int> primeFactors(int n){
  5.  
  6. 	unordered_map<int, int> mp;
  7.  
  8. 	while(n % 2 == 0){
  9. 		mp[2]++;
  10. 		n /= 2;
  11. 	}
  12.  
  13.  
  14. 	for (int i = 3; i <= sqrt(n); i += 2){
  15.  
  16. 		while(n % i == 0){
  17. 			mp[i]++;
  18. 			n /= i;
  19. 		}
  20.  
  21.  
  22. 	}
  23.  
  24.  
  25. 	if(n > 2){
  26. 		mp[n]++;
  27. 	}
  28.  
  29. 	return mp;
  30. }
  31.  
  32. int main()
  33. {
  34. 	int n; cin >> n;
  35. 	unordered_map<int, int> mp = primeFactors(n);
  36. 	for (auto i : mp){
  37. 		cout << i.first << " " << i.second << '\n';
  38. 	}
  39.  
  40. 	return 0;
  41. }
  42.  
  43.  
  44.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/tA2sC8
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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