Leetcode#12 Integer to Roman

原题地址

 

找规律+模拟,真没啥可说的。

 

代码:

 1 string intToRoman(int num) {

 2         string res;

 3         

 4         while (num >= 1000) {

 5             res += "M";

 6             num -= 1000;

 7         }

 8         if (num >= 900) {

 9             res += "CM";

10             num -= 900;

11         }

12         if (num >= 500) {

13             res += "D";

14             num -= 500;

15         }

16         if (num >= 400) {

17             res += "CD";

18             num -= 400;

19         }

20         while (num >= 100) {

21             res += "C";

22             num -= 100;

23         }

24         if (num >= 90) {

25             res += "XC";

26             num -= 90;

27         }

28         if (num >= 50) {

29             res += "L";

30             num -= 50;

31         }

32         if (num >= 40) {

33             res += "XL";

34             num -= 40;

35         }

36         while (num >= 10) {

37             res += "X";

38             num -= 10;

39         }

40         if (num >= 9) {

41             res += "IX";

42             num -= 9;

43         }

44         if (num >= 5) {

45             res += "V";

46             num -= 5;

47         }

48         if (num >= 4) {

49             res += "IV";

50             num -= 4;

51         }

52         while (num >= 1) {

53             res += "I";

54             num--;

55         }

56         

57         return res;

58 }

 

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