47 lines
1.1 KiB
Plaintext
47 lines
1.1 KiB
Plaintext
#COMPILE EXE
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#DIM ALL
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SUB aux(n AS INTEGER, i AS INTEGER, a() AS INTEGER, _
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u() AS INTEGER, v() AS INTEGER, m AS QUAD)
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LOCAL j, k, p, q AS INTEGER
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IF i > n THEN
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INCR m
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FOR k = 1 TO n : PRINT a(k); : NEXT : PRINT
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ELSE
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FOR j = i TO n
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k = a(j)
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p = i - k + n
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q = i + k - 1
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IF u(p) AND v(q) THEN
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u(p) = 0 : v(q) = 0
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a(j) = a(i) : a(i) = k
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CALL aux(n, i + 1, a(), u(), v(), m)
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u(p) = 1 : v(q) = 1
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a(i) = a(j) : a(j) = k
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END IF
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NEXT
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END IF
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END SUB
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FUNCTION PBMAIN () AS LONG
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LOCAL n, i AS INTEGER
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LOCAL m AS QUAD
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IF COMMAND$(1) <> "" THEN
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n = VAL(COMMAND$(1))
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REDIM a(1 TO n) AS INTEGER
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REDIM u(1 TO 2 * n - 1) AS INTEGER
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REDIM v(1 TO 2 * n - 1) AS INTEGER
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FOR i = 1 TO n
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a(i) = i
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NEXT
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FOR i = 1 TO 2 * n - 1
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u(i) = 1
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v(i) = 1
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NEXT
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m = 0
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CALL aux(n, 1, a(), u(), v(), m)
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PRINT m
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END IF
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END FUNCTION
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