int 와 long 범위를 넘어갈 때 사용하는 BigInteger import java.math.*; class Solution { public String solution(String a, String b) { String answer = ""; BigInteger numbera = new BigInteger(a); BigInteger numberb = new BigInteger(b); BigInteger bigNumber = numbera.add(numberb); answer = bigNumber.toString(); return answer; } } BigInteger numbera = new BigInteger(string or "100"); BigInteger numberb = new BigIn..