RosettaCodeData/Task/Non-continuous-subsequences/BBC-BASIC/non-continuous-subsequences...

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DIM list1$(3)
list1$() = "1", "2", "3", "4"
PRINT "For [1, 2, 3, 4] non-continuous subsequences are:"
PROCnon_continuous_subsequences(list1$())
DIM list2$(4)
list2$() = "1", "2", "3", "4", "5"
PRINT "For [1, 2, 3, 4, 5] non-continuous subsequences are:"
PROCnon_continuous_subsequences(list2$())
END
DEF PROCnon_continuous_subsequences(l$())
LOCAL i%, j%, g%, n%, r%, s%, w%, a$, b$
n% = DIM(l$(),1)
FOR s% = 0 TO n%-2
FOR g% = s%+1 TO n%-1
a$ = "["
FOR i% = s% TO g%-1
a$ += l$(i%) + ", "
NEXT
FOR w% = 1 TO n%-g%
r% = n%+1-g%-w%
FOR i% = 1 TO 2^r%-1 STEP 2
b$ = a$
FOR j% = 0 TO r%-1
IF i% AND 2^j% b$ += l$(g%+w%+j%) + ", "
NEXT
PRINT LEFT$(LEFT$(b$)) + "]"
NEXT i%
NEXT w%
NEXT g%
NEXT s%
ENDPROC