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[Silver IV] Title: 문자열 접기, Time: 36 ms, Memory: 32544 KB -BaekjoonHub
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‎백준/Silver/31846. 문자열 접기/README.md‎

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# [Silver IV] 문자열 접기 - 31846
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[문제 링크](https://www.acmicpc.net/problem/31846)
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### 성능 요약
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메모리: 32544 KB, 시간: 36 ms
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### 분류
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구현, 브루트포스 알고리즘
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### 제출 일자
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2025년 5월 31일 14:46:39
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### 문제 설명
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<p>기다란 종이에 알파벳 대문자로만 이루어진 문자열이 한 줄로 쓰여 있다. 예를 들어 아래 그림과 같이 종이에 “<span style="color:#e74c3c;"><code>ABAACA</code></span>”가 쓰여 있다고 가정하자. </p>
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<p style="text-align: center;"><img alt="" src="https://upload.acmicpc.net/a6890398-1b48-4613-884d-79a16519761a/-/preview/" style="width: 60%;"></p>
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<p>이제 이 종이를 <strong>한 번만</strong> 접을 것이다. 종이는 서로 이웃한 문자 사이에서만 접을 수 있다. 예를 들어 아래 그림과 같이 위 종이를 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c34"></mjx-c></mjx-mn></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>4</mn></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$4$</span></mjx-container>번째 문자와 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c35"></mjx-c></mjx-mn></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>5</mn></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$5$</span></mjx-container>번째 문자 사이에서 접을 수 있다. </p>
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<p style="text-align: center;"><img alt="" src="https://upload.acmicpc.net/e6d52e30-360e-436b-bec4-89b5f9bf40f8/-/preview/" style="width: 40%;"></p>
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<p>이때 서로 맞닿은 문자 쌍 중에서, 서로 같은 문자가 맞닿은 쌍의 개수가 이 접기의 점수가 된다. 예를 들어 앞에서의 접기의 점수는 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c31"></mjx-c></mjx-mn></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>1</mn></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ 1 $</span></mjx-container>점이 된다. 하지만 아래 그림과 같이 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c33"></mjx-c></mjx-mn></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>3</mn></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$3$</span></mjx-container>번째 문자와 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c34"></mjx-c></mjx-mn></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>4</mn></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$4$</span></mjx-container>번째 문자 사이에서 종이를 접으면 점수는 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c32"></mjx-c></mjx-mn></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2</mn></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ 2 $</span></mjx-container>점이 된다. </p>
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<p style="text-align: center;"><img alt="" src="https://upload.acmicpc.net/70cb0e4a-983e-42f8-b311-c5c77dad46aa/-/preview/" style="width: 30%;"></p>
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<p>이제 여러분은 알파벳 대문자로만 이루어진 문자열 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D446 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>S</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ S $</span></mjx-container>가 주어질 때, 다음과 같은 질문 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D444 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>Q</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ Q $</span></mjx-container>개에 답해야 한다. </p>
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<ul>
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<li><mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"> <mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D459 TEX-I"></mjx-c></mjx-mi><mjx-mtext class="mjx-n"><mjx-c class="mjx-cA0"></mjx-c></mjx-mtext><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D45F TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>l</mi><mtext> </mtext><mi>r</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ l \ r $</span></mjx-container>: 문자열 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D446 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>S</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ S $</span></mjx-container>의 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D459 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>l</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ l $</span></mjx-container>번째 문자, <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mrow><mjx-mo class="mjx-n"><mjx-c class="mjx-c28"></mjx-c></mjx-mo><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D459 TEX-I"></mjx-c></mjx-mi><mjx-mo class="mjx-n" space="3"><mjx-c class="mjx-c2B"></mjx-c></mjx-mo><mjx-mn class="mjx-n" space="3"><mjx-c class="mjx-c31"></mjx-c></mjx-mn><mjx-mo class="mjx-n"><mjx-c class="mjx-c29"></mjx-c></mjx-mo></mjx-mrow></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mrow data-mjx-texclass="INNER"><mo data-mjx-texclass="OPEN">(</mo><mi>l</mi><mo>+</mo><mn>1</mn><mo data-mjx-texclass="CLOSE">)</mo></mrow></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ \left( l+1 \right) $</span></mjx-container>번째 문자, <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mo class="mjx-n"><mjx-c class="mjx-c22EF"></mjx-c></mjx-mo></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo>⋯</mo></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ \cdots $</span></mjx-container>, <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D45F TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>r</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ r $</span></mjx-container>번째 문자가 차례대로 종이에 쓰여 있을 때, 종이를 한 번 접어서 얻을 수 있는 최대의 점수는 몇 점인가?</li>
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</ul>
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### 입력
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<p>첫 번째 줄에 문자열의 길이를 나타내는 정수 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D441 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>N</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ N $</span></mjx-container>이 주어진다. </p>
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<p>두 번째 줄에 알파벳 대문자로만 이루어진 문자열 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D446 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>S</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ S $</span></mjx-container>가 주어진다. </p>
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<p>세 번째 줄에 정수 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D444 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>Q</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ Q $</span></mjx-container>가 주어진다. </p>
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<p>네 번째 줄부터 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D444 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>Q</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$ Q $</span></mjx-container>개 줄에 걸쳐 위에서 설명한 질문을 나타내는 정수 <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D459 TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>l</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$l$</span></mjx-container>, <mjx-container class="MathJax" jax="CHTML" style="font-size: 104.6%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D45F TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>r</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$r$</span></mjx-container>이 공백으로 구분되어 주어진다. </p>
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### 출력
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<p>각 질문의 답을 나타내는 정수를 순서대로 한 줄에 하나씩 출력한다.</p>
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‎백준/Silver/31846. 문자열 접기/문자열 접기.py‎

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# 31846 문자열 접기
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import sys
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input = sys.stdin.readline
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# 문자열 길이
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n = int(input())
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# 문자열
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S = input().strip()
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# 질문 수
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Q = int(input())
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for _ in range(Q):
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res = 0
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l, r = map(int, input().split())
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check = S[l-1:r]
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# 한칸씩 접어봄
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for i in range(1, len(check)):
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cnt = 0
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up = list(reversed(check[:i]))
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down = list(check[i:])
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for j in range(min(len(up), len(down))):
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if up[j] == down[j]:
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cnt += 1
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res = max(cnt, res)
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print(res)

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