Package g0001_0100.s0012_integer_to_roman

Class Solution

java.lang.Object

g0001_0100.s0012_integer_to_roman.Solution

public class Solution
extends java.lang.Object

12 - Integer to Roman.

Medium

Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.

 Symbol   Value
  I        1
  V        5
  X        10
  L        50
  C        100
  D        500
  M        1000

For example, 2 is written as II in Roman numeral, just two one’s added together. 12 is written as XII, which is simply X + II. The number 27 is written as XXVII, which is XX + V + II.

Roman numerals are usually written largest to smallest from left to right. However, the numeral for four is not IIII. Instead, the number four is written as IV. Because the one is before the five we subtract it making four. The same principle applies to the number nine, which is written as IX. There are six instances where subtraction is used:

• I can be placed before V (5) and X (10) to make 4 and 9.
• X can be placed before L (50) and C (100) to make 40 and 90.
• C can be placed before D (500) and M (1000) to make 400 and 900.

Given an integer, convert it to a roman numeral.

Example 1:

Input: num = 3

Output: “III”

Example 2:

Input: num = 4

Output: “IV”

Example 3:

Input: num = 9

Output: “IX”

Example 4:

Input: num = 58

Output: “LVIII”

Explanation: L = 50, V = 5, III = 3.

Example 5:

Input: num = 1994

Output: “MCMXCIV”

Explanation: M = 1000, CM = 900, XC = 90 and IV = 4.

Constraints:

• 1 <= num <= 3999

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
java.lang.String	intToRoman(int num)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

intToRoman

public java.lang.String intToRoman(int num)