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[BOJ] #5582. 공통 부분 문자열 / 골드5 / 40분 / 성공
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import sys
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input = sys.stdin.readline
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# 입력
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S1 = input().strip()
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S2 = input().strip()
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# DP 초기화
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dp = [[0] * (len(S1) + 1) for _ in range(len(S2) + 1)]
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# DP 채우기
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for i in range(1, len(S2)+1):
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for j in range(1, len(S1)+1):
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if S2[i-1] == S1[j-1]:
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# 이전 값을 그대로 가져오거나 직전 문자열이 이어지고 있다면 +1 하거나
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dp[i][j] = dp[i-1][j-1] + 1
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# 정답 출력
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print(max(max(row) for row in dp))

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