{"componentChunkName":"component---src-templates-blog-post-js","path":"/Algorithm/BOJ-1701-Python/","result":{"data":{"site":{"siteMetadata":{"title":"hyesungoh","author":"hyesungoh","siteUrl":"https://www.hyesungoh.xyz","comment":{"disqusShortName":"","utterances":"hyesungoh/blog"},"sponsor":{"buyMeACoffeeId":""}}},"markdownRemark":{"id":"6dcb812a-82ea-512b-996e-ca487520c800","excerpt":"문자열 s가 주어진 후 2번 이상 들어가는 부분문자열의 최대 길이를 출력하는 문제. 첫번째 풀이는 처음부터 s의 길이 -1부터 2까지 문자열을 슬라이싱하여 LPS를 계산 후 KMP 알고리즘을 이용하여 2번 이상 존재할 시 return 및 break를 이용하여 해당 결과를 출력하여 풀었다. 시간제한이 0.5초이며 처음부터 시작하기 때문에 시간초과 및 틀렸습니다 결과를 받았다. 문제의 2번 이상 존재하는 경우를 통해 LPS만을 이용하여 계산하면 될 것 같아 0부터 s의 길이만큼 index…","html":"<p>문자열 s가 주어진 후 2번 이상 들어가는 부분문자열의 최대 길이를 출력하는 문제. 첫번째 풀이는 처음부터 s의 길이 -1부터 2까지 문자열을 슬라이싱하여 LPS를 계산 후 KMP 알고리즘을 이용하여 2번 이상 존재할 시 return 및 break를 이용하여 해당 결과를 출력하여 풀었다. 시간제한이 0.5초이며 처음부터 시작하기 때문에 시간초과 및 틀렸습니다 결과를 받았다. 문제의 2번 이상 존재하는 경우를 통해 LPS만을 이용하여 계산하면 될 것 같아 0부터 s의 길이만큼 index를 이동하여 슬라이싱한 값을 이용하여 LPS 중 최대값을 저장 및 갱신하여 풀었다.</p>\n<div class=\"gatsby-highlight\" data-language=\"python\"><pre class=\"language-python\"><code class=\"language-python\"><span class=\"token comment\"># def KMP(t, p, lps):</span>\n<span class=\"token comment\">#     lt = len(t)</span>\n<span class=\"token comment\">#     lp = len(p)</span>\n<span class=\"token comment\">#     ans = 0</span>\n<span class=\"token comment\">#     i = 0</span>\n<span class=\"token comment\">#     j = 0</span>\n<span class=\"token comment\">#     while i &lt; lt:</span>\n<span class=\"token comment\">#         if t[i] == p[j]:</span>\n<span class=\"token comment\">#             i += 1</span>\n<span class=\"token comment\">#             j += 1</span>\n<span class=\"token comment\">#         elif t[i] != p[j]:</span>\n<span class=\"token comment\">#             if j != 0:</span>\n<span class=\"token comment\">#                 j = lps[j-1]</span>\n<span class=\"token comment\">#             else:</span>\n<span class=\"token comment\">#                 i += 1</span>\n<span class=\"token comment\">#</span>\n<span class=\"token comment\">#         if j == lp:</span>\n<span class=\"token comment\">#             ans += 1</span>\n<span class=\"token comment\">#             if ans >= 2:</span>\n<span class=\"token comment\">#                 return True</span>\n<span class=\"token comment\">#             j = lps[j-1]</span>\n<span class=\"token comment\">#     return False</span>\n<span class=\"token comment\">#</span>\n<span class=\"token comment\"># def getLPS(p, lps):</span>\n<span class=\"token comment\">#     leng = 0</span>\n<span class=\"token comment\">#     i = 1</span>\n<span class=\"token comment\">#</span>\n<span class=\"token comment\">#     while i &lt; len(p):</span>\n<span class=\"token comment\">#         if p[i] == p[leng]:</span>\n<span class=\"token comment\">#             leng += 1</span>\n<span class=\"token comment\">#             lps[i] = leng</span>\n<span class=\"token comment\">#             i += 1</span>\n<span class=\"token comment\">#         else:</span>\n<span class=\"token comment\">#             if leng != 0:</span>\n<span class=\"token comment\">#                 leng = lps[leng-1]</span>\n<span class=\"token comment\">#             else:</span>\n<span class=\"token comment\">#                 lps[i] = 0</span>\n<span class=\"token comment\">#                 i += 1</span>\n<span class=\"token comment\">#</span>\n<span class=\"token comment\"># s = input()</span>\n<span class=\"token comment\"># ls = len(s)</span>\n<span class=\"token comment\"># for i in range(ls-1, 1, -1):</span>\n<span class=\"token comment\">#     pat = s[0:i]</span>\n<span class=\"token comment\">#     lps = [0 for _ in range(i)]</span>\n<span class=\"token comment\">#     getLPS(pat, lps)</span>\n<span class=\"token comment\">#     if KMP(s, pat, lps):</span>\n<span class=\"token comment\">#         print(i)</span>\n<span class=\"token comment\">#         break</span>\n\n\n<span class=\"token keyword\">def</span> <span class=\"token function\">getLpsMax</span><span class=\"token punctuation\">(</span>p<span class=\"token punctuation\">)</span><span class=\"token punctuation\">:</span>\n    lps <span class=\"token operator\">=</span> <span class=\"token punctuation\">[</span><span class=\"token number\">0</span> <span class=\"token keyword\">for</span> _ <span class=\"token keyword\">in</span> <span class=\"token builtin\">range</span><span class=\"token punctuation\">(</span><span class=\"token builtin\">len</span><span class=\"token punctuation\">(</span>p<span class=\"token punctuation\">)</span><span class=\"token punctuation\">)</span><span class=\"token punctuation\">]</span>\n    leng <span class=\"token operator\">=</span> <span class=\"token number\">0</span>\n    i <span class=\"token operator\">=</span> <span class=\"token number\">1</span>\n\n    <span class=\"token keyword\">while</span> i <span class=\"token operator\">&lt;</span> <span class=\"token builtin\">len</span><span class=\"token punctuation\">(</span>p<span class=\"token punctuation\">)</span><span class=\"token punctuation\">:</span>\n        <span class=\"token keyword\">if</span> p<span class=\"token punctuation\">[</span>i<span class=\"token punctuation\">]</span> <span class=\"token operator\">==</span> p<span class=\"token punctuation\">[</span>leng<span class=\"token punctuation\">]</span><span class=\"token punctuation\">:</span>\n            leng <span class=\"token operator\">+=</span> <span class=\"token number\">1</span>\n            lps<span class=\"token punctuation\">[</span>i<span class=\"token punctuation\">]</span> <span class=\"token operator\">=</span> leng\n            i <span class=\"token operator\">+=</span> <span class=\"token number\">1</span>\n        <span class=\"token keyword\">else</span><span class=\"token punctuation\">:</span>\n            <span class=\"token keyword\">if</span> leng <span class=\"token operator\">!=</span> <span class=\"token number\">0</span><span class=\"token punctuation\">:</span>\n                leng <span class=\"token operator\">=</span> lps<span class=\"token punctuation\">[</span>leng <span class=\"token operator\">-</span> <span class=\"token number\">1</span><span class=\"token punctuation\">]</span>\n            <span class=\"token keyword\">else</span><span class=\"token punctuation\">:</span>\n                lps<span class=\"token punctuation\">[</span>i<span class=\"token punctuation\">]</span> <span class=\"token operator\">=</span> <span class=\"token number\">0</span>\n                i <span class=\"token operator\">+=</span> <span class=\"token number\">1</span>\n    <span class=\"token keyword\">return</span> <span class=\"token builtin\">max</span><span class=\"token punctuation\">(</span>lps<span class=\"token punctuation\">)</span>\n\ns <span class=\"token operator\">=</span> <span class=\"token builtin\">input</span><span class=\"token punctuation\">(</span><span class=\"token punctuation\">)</span>\nls <span class=\"token operator\">=</span> <span class=\"token builtin\">len</span><span class=\"token punctuation\">(</span>s<span class=\"token punctuation\">)</span>\nans <span class=\"token operator\">=</span> <span class=\"token number\">0</span>\n<span class=\"token keyword\">for</span> i <span class=\"token keyword\">in</span> <span class=\"token builtin\">range</span><span class=\"token punctuation\">(</span>ls<span class=\"token punctuation\">)</span><span class=\"token punctuation\">:</span>\n    p <span class=\"token operator\">=</span> s<span class=\"token punctuation\">[</span>i<span class=\"token punctuation\">:</span>ls<span class=\"token punctuation\">]</span>\n    ans <span class=\"token operator\">=</span> <span class=\"token builtin\">max</span><span class=\"token punctuation\">(</span>getLpsMax<span class=\"token punctuation\">(</span>p<span class=\"token punctuation\">)</span><span class=\"token punctuation\">,</span> ans<span class=\"token punctuation\">)</span>\n<span class=\"token keyword\">print</span><span class=\"token punctuation\">(</span>ans<span class=\"token punctuation\">)</span></code></pre></div>","frontmatter":{"title":"BOJ-1701 - Python","date":"November 30, 2020"}}},"pageContext":{"slug":"/Algorithm/BOJ-1701-Python/","previous":{"fields":{"slug":"/Algorithm/BOJ-1786-Python/"},"frontmatter":{"title":"BOJ-1786 - Python","category":"Algorithm","draft":false}},"next":{"fields":{"slug":"/Algorithm/BOJ-1305-Python/"},"frontmatter":{"title":"BOJ-1305 - Python","category":"Algorithm","draft":false}}}},"staticQueryHashes":["3128451518","3290666882"]}