solution.ts

function intToRoman (num: number): string {
    const l1 = ['I', 'II', 'III', 'IV', 'V', 'VI', 'VII', 'VIII', 'IX', ];
    const l2 = ['X', 'XX', 'XXX', 'XL', 'L', 'LX', 'LXX', 'LXXX', 'XC', ];
    const l3 = ['C', 'CC', 'CCC', 'CD', 'D', 'DC', 'DCC', 'DCCC', 'CM', ];
    const l4 = ['M', 'MM', 'MMM', ];
    const result:string[] = [];
    if (num > 999) {
        const rest = num % 1000;
        const count = (num - rest) / 1000;
        result.push(l4[count - 1]);
        num = rest;
    }
    if (num > 99) {
        const rest = num % 100;
        const count = (num - rest) / 100;
        result.push(l3[count - 1]);
        num = rest;
    }
    if (num > 9) {
        const rest = num % 10;
        const count = (num - rest) / 10;
        result.push(l2[count - 1]);
        num = rest;
    }
    if (num > 0) {
        result.push(l1[num - 1]);
    }
    return result.join('');
}