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  1. #include <iostream>
  2. #include <string>
  3. #include <bits/stdc++.h>
  4. using namespace std;
  5.  
  6. /**
  7. Convert decimal number lying between 1-3999 to roman numerals
  8.  
  9. SYMBOL       VALUE
  10. I             1
  11. II			  2
  12. III			  3
  13. IV            4
  14. V             5
  15. X             10
  16. L             50
  17. C             100
  18. D             500
  19. M             1000     
  20. **/
  21.  
  22. /*
  23. 3999 - MMMMCMXCIX -> 3000 + 900 + 90 + 9 
  24. */
  25.  
  26. string roman(int num){
  27.  
  28. 	vector<int> n = {1000, 900, 500, 400,100, 90, 50, 40, 10, 9, 5, 4, 3, 2, 1};
  29. 	vector<string> roman  = {"M", "CM", "L", "CL", "C", "XC","L", "XL", "X", "IX","V", "IV", "III","II","I" };
  30.  
  31. 	string ans = "";
  32. 	int i=0;
  33.  
  34. 	while(num>0) {
  35. 		if(num>=n[i]) {
  36. 			ans+=roman[i];
  37. 			num-=n[i];
  38. 		}
  39. 		else i++;
  40. 	}
  41.  
  42.  
  43. 	return ans;
  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 5284KB
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CCCLXI
https://ideone.com/jn2giY
language:
C++ (gcc 8.3)
created:
10 days ago
visibility:
public

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