[알고리즘문제풀기] 문자열 섞기

문제

내가 작성한 정답

class Solution {
    public String solution(String str1, String str2) {
        StringBuilder answer = new StringBuilder();
        for(int i=0; i<str1.length(); i++){
            answer.append(str1.charAt(i)).append(str2.charAt(i));
        }
        return answer.toString();
    }
}

다른 사람들의 정답

import java.util.stream.Collectors;
import java.util.stream.IntStream;

class Solution {
    public String solution(String str1, String str2) {
        return IntStream.range(0, str1.length())
                .mapToObj(i -> Character.toString(str1.charAt(i)) + str2.charAt(i))
                .collect(Collectors.joining());
    }
}