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  1. #include <bits/stdc++.h>
  2. #include <string>
  3. using namespace std;
  4.  
  5. /**
  6. Convert decimal number lying between 1-3999 to roman numerals
  7.  
  8. SYMBOL       VALUE
  9. I             1
  10. II			  2
  11. III			  3
  12. IV            4
  13. V             5
  14. X             10
  15. L             50
  16. C             100
  17. D             500
  18. M             1000     
  19. **/
  20.  
  21. vector<pair<int, string>> romanMapping = {
  22.     {1000, "M"}, {900, "CM"}, {500, "D"}, {400, "CD"},
  23.     {100, "C"}, {90, "XC"}, {50, "L"}, {40, "XL"},
  24.     {10, "X"}, {9, "IX"}, {5, "V"}, {4, "IV"}, {1, "I"}
  25. };
  26.  
  27. string roman(int n){
  28.  
  29. 	string rom = "";
  30. 	for(pair<int,string> &p : romanMapping) {
  31.  
  32. 		if(p.first < n) {
  33.  
  34. 			rom+= p.second;
  35. 			rom+= roman(n%(p.first));
  36.  
  37. 			break;
  38. 		}
  39. 	}
  40.  
  41. 	return rom;
  42.  
  43.  
  44. }
  45.  
  46. int main() {
  47. 	int intNum = 0;
  48. 	cin >> intNum;
  49. 	cout << roman(intNum);
  50. 	return 0;
  51. }
Success #stdin #stdout 0.01s 5272KB
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IX
https://ideone.com/x8O7aC
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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