Package g0001_0100.s0012_integer_to_roman

Class Solution

  • public class Solution
extends 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 Detail

      • Solution

        public Solution()

    • Method Detail

      • intToRoman

        public String intToRoman​(int num)