[알고리즘문제풀기] 문자열 섞기

문제

내가 작성한 정답

// 1-1. string "" -> 그냥 char끼리 더하면 숫자로 나옴
class Solution {
    public String solution(String str1, String str2) {
        String answer = "";
        for(int i=0; i<str1.length(); i++){
            answer += ""+str1.charAt(i)+str2.charAt(i);
        }
        return answer;
    }
}

// 1-2. string String.valueOf
class Solution {
    public String solution(String str1, String str2) {
        String answer = "";
        for(int i=0; i<str1.length(); i++){
            answer += String.valueOf(str1.charAt(i))+String.valueOf(str2.charAt(i));
        }
        return answer;
    }
}

// 2. StringBuilder
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();
    }
}

// 3. char[]
class Solution {
    public String solution(String str1, String str2) {
        StringBuilder answer = new StringBuilder();
        char[] str11 = str1.toCharArray(), str22 = str2.toCharArray();
        for(int i=0; i<str1.length(); i++){
            answer.append(str11[i]).append(str22[i]);
        }
        return answer.toString();
    }
}


// 만약 길이가 같이 않을 경우 조건 추가
class Solution {
    public String solution(String str1, String str2) {
        String answer = "";
        int a = str1.length(),b = str2.length();
        int ma = Math.max(a,b), mi = Math.min(a,b);
        for(int i=0; i<mi; i++){
            answer += "" + str1.charAt(i) + str2.charAt(i);
        }
        for(int i=mi; i<ma; i++){
            answer += "" + (a == ma ? str1.charAt(i) : str2.charAt(i));
        }
        return answer;
    }
}