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[Silver IV] Title: 새로운 문자열 만들기, Time: 48 ms, Memory: 34068 KB -Baekjo…
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| # [Silver IV] 새로운 문자열 만들기 - 30089 | ||
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| [문제 링크](https://www.acmicpc.net/problem/30089) | ||
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| ### 성능 요약 | ||
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| 메모리: 34068 KB, 시간: 48 ms | ||
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| ### 분류 | ||
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| 브루트포스 알고리즘, 문자열 | ||
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| ### 제출 일자 | ||
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| 2024년 9월 14일 16:57:07 | ||
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| ### 문제 설명 | ||
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| <p><mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"> <mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D447 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>T</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$T$</span></mjx-container>개의 줄마다 영어 대문자로만 이루어진 문자열 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; 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, 각 줄마다 아래 조건을 모두 만족하는 문자열 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44B 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>X</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$X$</span></mjx-container>를 출력하여라.</p> | ||
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| <ol> | ||
| <li><mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"> <mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44B 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>X</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$X$</span></mjx-container>는 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; 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>로 시작하여야 한다.</li> | ||
| <li><mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"> <mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44B 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>X</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$X$</span></mjx-container>를 뒤에서부터 읽은 문자열 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-msup><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44B TEX-I"></mjx-c></mjx-mi><mjx-script style="vertical-align: 0.363em; margin-left: 0.051em;"><mjx-mo class="mjx-var" size="s"><mjx-c class="mjx-c2032"></mjx-c></mjx-mo></mjx-script></mjx-msup></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi>X</mi><mo data-mjx-alternate="1">′</mo></msup></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$X'$</span></mjx-container>에 대해서도 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; 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>로 시작하여야 한다.</li> | ||
| <li>위 조건을 만족하는 문자열이 여러 가지라면, 가장 길이가 짧은 문자열이 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44B 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>X</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$X$</span></mjx-container>가 된다.</li> | ||
| </ol> | ||
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| <p>가능한 모든 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; 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>에 대해서 조건을 만족하는 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44B 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>X</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$X$</span></mjx-container>는 유일함을 증명할 수 있다.</p> | ||
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| ### 입력 | ||
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| <p>첫 번째 줄에 주어지는 문자열의 개수 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D447 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>T</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$T$</span></mjx-container>가 주어진다. (<mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; 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-mo class="mjx-n" space="4"><mjx-c class="mjx-c2264"></mjx-c></mjx-mo><mjx-mi class="mjx-i" space="4"><mjx-c class="mjx-c1D447 TEX-I"></mjx-c></mjx-mi><mjx-mo class="mjx-n" space="4"><mjx-c class="mjx-c2264"></mjx-c></mjx-mo><mjx-mn class="mjx-n" space="4"><mjx-c class="mjx-c31"></mjx-c><mjx-c class="mjx-c30"></mjx-c><mjx-c class="mjx-c30"></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><mo>≤</mo><mi>T</mi><mo>≤</mo><mn>100</mn></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$1 \le T \le 100$</span></mjx-container>)</p> | ||
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| <p>두 번째 줄부터 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D447 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>T</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$T$</span></mjx-container>개의 줄에 걸쳐 문자열 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; 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. 각 줄마다 주어지는 문자열 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; 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 길이는 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; 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>이상 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c32"></mjx-c><mjx-c class="mjx-c30"></mjx-c></mjx-mn></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>20</mn></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$20$</span></mjx-container>이하이다.</p> | ||
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| ### 출력 | ||
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| <p><mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"> <mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D447 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>T</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$T$</span></mjx-container>개의 줄에 걸쳐 주어진 문자열 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; 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>마다 조건을 모두 만족하는 문자열 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44B 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>X</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$X$</span></mjx-container>를 출력한다.</p> | ||
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| """ | ||
| [반례] | ||
| - 짝수개, 이미 펠린드롬문자열 : ABBA (expected; ABBA) | ||
| - 부분 팰린드롬 안될때, 뒤집고 하나 곂쳐서 출력 : ABCDBA (expedted; ABCDBABDCBA) | ||
| [시도2] | ||
| - 일치하면, 앞/뒤 포인터 가운데로 이동 | ||
| - 다르면, 앞 글자 뒤에 추가하고 앞 포인터만 움직이기 | ||
| [시도1] | ||
| - 앞N번째 = 뒤N번째 모든 자릿수 같으면, S 그 자체 | ||
| - 하나라도 다르면 그냥 S + 역S (홀수면 S-1) | ||
| """ | ||
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| import sys | ||
| readline = lambda: sys.stdin.readline().strip() | ||
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| from collections import deque | ||
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| N = int(readline()) | ||
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| for _ in range(N): | ||
| word = readline() | ||
| length = len(word) | ||
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| front_p = 0 | ||
| rear_p = length - 1 | ||
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| is_pelin = True | ||
| rear_p_move = 1 | ||
| while front_p < rear_p: | ||
| if word[front_p] == word[rear_p]: | ||
| rear_p -= 1 | ||
| rear_p_move += 1 | ||
| else: | ||
| rear_p = length - 1 | ||
| rear_p_move = 1 | ||
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| is_pelin = False | ||
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| front_p += 1 | ||
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| sliced = list(word)[: front_p + 1] | ||
| reversed = sliced[: length - rear_p_move] | ||
| reversed.reverse() | ||
| result = sliced + reversed | ||
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| if is_pelin: | ||
| print("".join(word)) | ||
| else: | ||
| print("".join(result)) |