[PCC] PythonChallenge Level 2 problem-soving

Level 2 problem-soving

바로 전에 Level 1 문제에 대해서 풀어 보았다.

[PPC] pythonchallenge Level 1 problem-soving

이번에 Level 2 문제에 대해서 풀어 보도록 하자.

1. 문제 확인

Level 1 문제를 풀고 나서 확인된 Level 2 문제의 주소는 아래와 같다.

• http://www.pythonchallenge.com/pc/def/ocr.html

ocr

1. 문제 확인

일단 문제는 확인하였고 화면에는 Level 1 문제와 비슷하게 빨간색으로 작성된 내용과 노란색으로 작성된 힌트 내용들이 보였다.

문제를 확인했으니 이제 한번 풀어보도록 하자.

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2. 풀이 과정

문제를 보고 우선 빨간색으로 작성된 내용에 대해서 확인해 보았다.

"recognize the characters. maybe they are in the book, but MAYBE they are in the page source.(문자를 인식합니다. 책에 있을 수도 있지만 페이지 소스에 있을 수도 있습니다.)"

빨간색으로 작성된 내용만으로는 바로 인식이 어려웠다. 다만, 페이지 소스에 무언가 확인해야 할 내용이 있을 것 같아 브라우저에서 페이지 소스를 확인해보았다.

역시 페이지 소스에 화면에 표현된 HTML을 제외하고 무언가 난독화된 내용으로 작성된 내용이 있었다.

2. 풀이 과정

주석으로 "find rare characters in the mess below(아래 엉망진창에서 희귀 캐릭터를 찾으십시오.)"라는 내용이 작성되어 있고, 그 아래 난독화된 내용을 같이 확인할 수 있었다.

내용은 너무 길어서 아래와 같이 "+ 내용 더보기"를 통해서 확인 가능하다.

<!--
find rare characters in the mess below:
-->

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내용을 보니 특수문자가 너무 많은 관계로 일단 특수문자를 제거하는 파이썬 코드를 먼저 작성해 보도록 하자.

text_str.txt

0.09MB

#!/usr/bin/python
# -*- coding: utf-8 -*-

if __name__ == "__main__":
    f = open('text_str.txt', 'r')
    re_special_char = f.read()
    new_str = ''.join(filter(str.isalpha, re_special_char))
    print(new_str)
    f.close()



### OUTPUT ###
equality

해당 내용에서 특수문자를 제거하고 나니 바로 "equality" 라는 단어가 추출 되었다. 

일단 정답인지는 모르겠지만 다음 힌트를 얻을 수 있는 페이지가 나올 수 있기에 추출된 단어를 한번 URL에 입력해 보았다.

728x90

2. 풀이 과정

입력한 URL에서 Level 3 문제가 나왔다.

Level 2 문제의 정답은 특수문자를 제거해서 나온 "equality" 단어였다. 생각보다 한번에 풀렸다.

우연하게 한번에 해결이 되었지만 위 과정을 통해서 Level 2 문제에 대해서 이렇게 해결 할 수 있었다.

해결을 위해서 작성한 코드에 대해서는 Github를 통해서 확인할 수 있다. 

GitHub - happylie/pythonchallenge_code: Problem solving code for pythonchallenge.com site(pythonchallenge.com 사이트 문제

앞으로도 계속 천천히 풀어나가면서 풀었던 내용에 대해서는 잘 작성해보도록 하겠다.