class Solution {
    
    private static final int[] values = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};    
    private static final String[] symbols = {"M","CM","D","CD","C","XC","L","XL","X","IX","V","IV","I"};

    public String intToRoman(int num) {
        StringBuilder sb = new StringBuilder();
        
        // Loop through each symbol, stopping if num becomes 0.
        for (int i = 0; i < values.length && num > 0; i++) {
            // Repeat while the current symbol still fits into num.
            while (values[i] <= num) {
                num -= values[i];
                sb.append(symbols[i]);
            }
        }
        
        return sb.toString();
    }
}