12. Integer to Roman

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

StringBuilder sb = new StringBuilder();
for (int i = 0; i < values.length && num > 0; i++) {
while (num >= values[i]) {
sb.append(symbols[i]);
num -= values[i];
}
}

return sb.toString();
}
}

Reference

12. Integer to Roman