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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Longest-common-subsequence/BBC-BASIC/longest-common-subsequence.basic Normal file
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PRINT FNlcs("1234", "1224533324")
PRINT FNlcs("thisisatest", "testing123testing")
END
DEF FNlcs(a$, b$)
IF a$="" OR b$="" THEN = ""
IF RIGHT$(a$) = RIGHT$(b$) THEN = FNlcs(LEFT$(a$), LEFT$(b$)) + RIGHT$(a$)
LOCAL x$, y$
x$ = FNlcs(a$, LEFT$(b$))
y$ = FNlcs(LEFT$(a$), b$)
IF LEN(y$) > LEN(x$) SWAP x$,y$
= x$