Integer to Roman | DevFlow

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Integer to Roman

Asked 1 month ago

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Seven different symbols represent Roman numerals with the following values:

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

Roman numerals are formed by appending the conversions of decimal place values from highest to lowest. Converting a decimal place value into a Roman numeral has the following rules:

If the value does not start with 4 or 9, select the symbol of the maximal value that can be subtracted from the input, append that symbol to the result, subtract its value, and convert the remainder to a Roman numeral.
If the value starts with 4 or 9 use the subtractive form representing one symbol subtracted from the following symbol, for example, 4 is 1 (I) less than 5 (V): IV and 9 is 1 (I) less than 10 (X): IX. Only the following subtractive forms are used: 4 (IV), 9 (IX), 40 (XL), 90 (XC), 400 (CD) and 900 (CM).
Only powers of 10 (I, X, C, M) can be appended consecutively at most 3 times to represent multiples of 10. You cannot append 5 (V), 50 (L), or 500 (D) multiple times. If you need to append a symbol 4 times use the subtractive form.

Given an integer, convert it to a Roman numeral.

Example 1:

Input: num = 3749

Output: "MMMDCCXLIX"

Explanation:

Example 2:

Input: num = 58

Output: "LVIII"

Explanation:

Example 3:

Input: num = 1994

Output: "MCMXCIV"

Explanation:

Constraints:

1 <= num <= 3999

1 Answer

1

Wirte your answer here

13000 = MMM as 1000 (M) + 1000 (M) + 1000 (M)
2 700 = DCC as 500 (D) + 100 (C) + 100 (C)
3  40 = XL as 10 (X) less of 50 (L)
4

13000 = MMM as 1000 (M) + 1000 (M) + 1000 (M)
2 700 = DCC as 500 (D) + 100 (C) + 100 (C)
3  40 = XL as 10 (X) less of 50 (L)
4

150 = L
2 8 = VIII
3

150 = L
2 8 = VIII
3

11000 = M
2 900 = CM
3  90 = XC
4   4 = IV
5

11000 = M
2 900 = CM
3  90 = XC
4   4 = IV
5

1/**
2 * @param {number} num
3 * @return {string}
4 */
5var intToRoman = function(num) {
6    const romanNumerals = [
7        { value: 1000, numeral: 'M' },
8        { value: 900, numeral: 'CM' },
9        { value: 500, numeral: 'D' },
10        { value: 400, numeral: 'CD' },
11        { value: 100, numeral: 'C' },
12        { value: 90, numeral: 'XC' },
13        { value: 50, numeral: 'L' },
14        { value: 40, numeral: 'XL' },
15        { value: 10, numeral: 'X' },
16        { value: 9, numeral: 'IX' },
17        { value: 5, numeral: 'V' },
18        { value: 4, numeral: 'IV' },
19        { value: 1, numeral: 'I' }
20    ];
21
22    let result = ''
23    for(let i = 0; i < romanNumerals.length; i++){
24        while(num >= romanNumerals[i].value){
25            result += romanNumerals[i].numeral
26            num -= romanNumerals[i].value
27        }
28    }
29
30    return result
31};

1/**
2 * @param {number} num
3 * @return {string}
4 */
5var intToRoman = function(num) {
6    const romanNumerals = [
7        { value: 1000, numeral: 'M' },
8        { value: 900, numeral: 'CM' },
9        { value: 500, numeral: 'D' },
10        { value: 400, numeral: 'CD' },
11        { value: 100, numeral: 'C' },
12        { value: 90, numeral: 'XC' },
13        { value: 50, numeral: 'L' },
14        { value: 40, numeral: 'XL' },
15        { value: 10, numeral: 'X' },
16        { value: 9, numeral: 'IX' },
17        { value: 5, numeral: 'V' },
18        { value: 4, numeral: 'IV' },
19        { value: 1, numeral: 'I' }
20    ];
21
22    let result = ''
23    for(let i = 0; i < romanNumerals.length; i++){
24        while(num >= romanNumerals[i].value){
25            result += romanNumerals[i].numeral
26            num -= romanNumerals[i].value
27        }
28    }
29
30    return result
31};

Integer to Roman | DevFlow