[알고리즘문제풀기] 문자열안에 문자열

문제

내가 작성한 정답

class Solution {
    public int solution(String str1, String str2) {
        return str1.contains(str2)?1:2;
    }
}

class Solution {
    public int solution(String str1, String str2) {
        int answer = 2;
        for(int i=0;i<str1.length()-1; i++){
            if( str1.substring(i).startsWith(str2)) answer = 1;
        }
        return answer;
    }
}

다른 사람들의 정답

class Solution {
    public int solution(String str1, String str2) {
        int answer = 0;

        boolean result = false;
        for (int i = 0; i < str1.length(); i++) {
            char chr = str1.charAt(i);

            if (chr == str2.charAt(0)) {
                int len = i + str2.length();
                String str = (len < str1.length() ? str1.substring(i, len) : str1.substring(i));

                if (str.equals(str2)) { result = true; break; }
            }
        }

        if (result) answer = 1; 
        else answer = 2;

        return answer;
    }
}