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subsets.go
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subsets.go
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package subsets
import (
"fmt"
"strings"
)
type Callback func(indexes []int)
func Enumerate(n int, callback Callback) {
if n > limit {
panic(fmt.Sprintf("%d exceeds compile-time limit of %d", n, limit))
}
if n <= 0 {
return
}
var (
numCombs = (1 << uint(n)) - 1
indexes [limit]int
ptr = subsets
)
for i := 0; i <= numCombs; i++ {
ind := strings.IndexByte(ptr, '\n')
this := ptr[:ind]
ptr = ptr[ind+1:]
count := 0
for _, c := range this {
indexes[count] = int(c - 'A')
count++
}
callback(indexes[:count])
}
}
const (
limit = 16
subsets = `
A
B
AB
C
AC
BC
ABC
D
AD
BD
ABD
CD
ACD
BCD
ABCD
E
AE
BE
ABE
CE
ACE
BCE
ABCE
DE
ADE
BDE
ABDE
CDE
ACDE
BCDE
ABCDE
F
AF
BF
ABF
CF
ACF
BCF
ABCF
DF
ADF
BDF
ABDF
CDF
ACDF
BCDF
ABCDF
EF
AEF
BEF
ABEF
CEF
ACEF
BCEF
ABCEF
DEF
ADEF
BDEF
ABDEF
CDEF
ACDEF
BCDEF
ABCDEF
G
AG
BG
ABG
CG
ACG
BCG
ABCG
DG
ADG
BDG
ABDG
CDG
ACDG
BCDG
ABCDG
EG
AEG
BEG
ABEG
CEG
ACEG
BCEG
ABCEG
DEG
ADEG
BDEG
ABDEG
CDEG
ACDEG
BCDEG
ABCDEG
FG
AFG
BFG
ABFG
CFG
ACFG
BCFG
ABCFG
DFG
ADFG
BDFG
ABDFG
CDFG
ACDFG
BCDFG
ABCDFG
EFG
AEFG
BEFG
ABEFG
CEFG
ACEFG
BCEFG
ABCEFG
DEFG
ADEFG
BDEFG
ABDEFG
CDEFG
ACDEFG
BCDEFG
ABCDEFG
H
AH
BH
ABH
CH
ACH
BCH
ABCH
DH
ADH
BDH
ABDH
CDH
ACDH
BCDH
ABCDH
EH
AEH
BEH
ABEH
CEH
ACEH
BCEH
ABCEH
DEH
ADEH
BDEH
ABDEH
CDEH
ACDEH
BCDEH
ABCDEH
FH
AFH
BFH
ABFH
CFH
ACFH
BCFH
ABCFH
DFH
ADFH
BDFH
ABDFH
CDFH
ACDFH
BCDFH
ABCDFH
EFH
AEFH
BEFH
ABEFH
CEFH
ACEFH
BCEFH
ABCEFH
DEFH
ADEFH
BDEFH
ABDEFH
CDEFH
ACDEFH
BCDEFH
ABCDEFH
GH
AGH
BGH
ABGH
CGH
ACGH
BCGH
ABCGH
DGH
ADGH
BDGH
ABDGH
CDGH
ACDGH
BCDGH
ABCDGH
EGH
AEGH
BEGH
ABEGH
CEGH
ACEGH
BCEGH
ABCEGH
DEGH
ADEGH
BDEGH
ABDEGH
CDEGH
ACDEGH
BCDEGH
ABCDEGH
FGH
AFGH
BFGH
ABFGH
CFGH
ACFGH
BCFGH
ABCFGH
DFGH
ADFGH
BDFGH
ABDFGH
CDFGH
ACDFGH
BCDFGH
ABCDFGH
EFGH
AEFGH
BEFGH
ABEFGH
CEFGH
ACEFGH
BCEFGH
ABCEFGH
DEFGH
ADEFGH
BDEFGH
ABDEFGH
CDEFGH
ACDEFGH
BCDEFGH
ABCDEFGH
I
AI
BI
ABI
CI
ACI
BCI
ABCI
DI
ADI
BDI
ABDI
CDI
ACDI
BCDI
ABCDI
EI
AEI
BEI
ABEI
CEI
ACEI
BCEI
ABCEI
DEI
ADEI
BDEI
ABDEI
CDEI
ACDEI
BCDEI
ABCDEI
FI
AFI
BFI
ABFI
CFI
ACFI
BCFI
ABCFI
DFI
ADFI
BDFI
ABDFI
CDFI
ACDFI
BCDFI
ABCDFI
EFI
AEFI
BEFI
ABEFI
CEFI
ACEFI
BCEFI
ABCEFI
DEFI
ADEFI
BDEFI
ABDEFI
CDEFI
ACDEFI
BCDEFI
ABCDEFI
GI
AGI
BGI
ABGI
CGI
ACGI
BCGI
ABCGI
DGI
ADGI
BDGI
ABDGI
CDGI
ACDGI
BCDGI
ABCDGI
EGI
AEGI
BEGI
ABEGI
CEGI
ACEGI
BCEGI
ABCEGI
DEGI
ADEGI
BDEGI
ABDEGI
CDEGI
ACDEGI
BCDEGI
ABCDEGI
FGI
AFGI
BFGI
ABFGI
CFGI
ACFGI
BCFGI
ABCFGI
DFGI
ADFGI
BDFGI
ABDFGI
CDFGI
ACDFGI
BCDFGI
ABCDFGI
EFGI
AEFGI
BEFGI
ABEFGI
CEFGI
ACEFGI
BCEFGI
ABCEFGI
DEFGI
ADEFGI
BDEFGI
ABDEFGI
CDEFGI
ACDEFGI
BCDEFGI
ABCDEFGI
HI
AHI
BHI
ABHI
CHI
ACHI
BCHI
ABCHI
DHI
ADHI
BDHI
ABDHI
CDHI
ACDHI
BCDHI
ABCDHI
EHI
AEHI
BEHI
ABEHI
CEHI
ACEHI
BCEHI
ABCEHI
DEHI
ADEHI
BDEHI
ABDEHI
CDEHI
ACDEHI
BCDEHI
ABCDEHI
FHI
AFHI
BFHI
ABFHI
CFHI
ACFHI
BCFHI
ABCFHI
DFHI
ADFHI
BDFHI
ABDFHI
CDFHI
ACDFHI
BCDFHI
ABCDFHI
EFHI
AEFHI
BEFHI
ABEFHI
CEFHI
ACEFHI
BCEFHI
ABCEFHI
DEFHI
ADEFHI
BDEFHI
ABDEFHI
CDEFHI
ACDEFHI
BCDEFHI
ABCDEFHI
GHI
AGHI
BGHI
ABGHI
CGHI
ACGHI
BCGHI
ABCGHI
DGHI
ADGHI
BDGHI
ABDGHI
CDGHI
ACDGHI
BCDGHI
ABCDGHI
EGHI
AEGHI
BEGHI
ABEGHI
CEGHI
ACEGHI
BCEGHI
ABCEGHI
DEGHI
ADEGHI
BDEGHI
ABDEGHI
CDEGHI
ACDEGHI
BCDEGHI
ABCDEGHI
FGHI
AFGHI
BFGHI
ABFGHI
CFGHI
ACFGHI
BCFGHI
ABCFGHI
DFGHI
ADFGHI
BDFGHI
ABDFGHI
CDFGHI
ACDFGHI
BCDFGHI
ABCDFGHI
EFGHI
AEFGHI
BEFGHI
ABEFGHI
CEFGHI
ACEFGHI
BCEFGHI
ABCEFGHI
DEFGHI
ADEFGHI
BDEFGHI
ABDEFGHI
CDEFGHI
ACDEFGHI
BCDEFGHI
ABCDEFGHI
J
AJ
BJ
ABJ
CJ
ACJ
BCJ
ABCJ
DJ
ADJ
BDJ
ABDJ
CDJ
ACDJ
BCDJ
ABCDJ
EJ
AEJ
BEJ
ABEJ
CEJ
ACEJ
BCEJ
ABCEJ
DEJ
ADEJ
BDEJ
ABDEJ
CDEJ
ACDEJ
BCDEJ
ABCDEJ
FJ
AFJ
BFJ
ABFJ
CFJ
ACFJ
BCFJ
ABCFJ
DFJ
ADFJ
BDFJ
ABDFJ
CDFJ
ACDFJ
BCDFJ
ABCDFJ
EFJ
AEFJ
BEFJ
ABEFJ
CEFJ
ACEFJ
BCEFJ
ABCEFJ
DEFJ
ADEFJ
BDEFJ
ABDEFJ
CDEFJ
ACDEFJ
BCDEFJ
ABCDEFJ
GJ
AGJ
BGJ
ABGJ
CGJ
ACGJ
BCGJ
ABCGJ
DGJ
ADGJ
BDGJ
ABDGJ
CDGJ
ACDGJ
BCDGJ
ABCDGJ
EGJ
AEGJ
BEGJ
ABEGJ
CEGJ
ACEGJ
BCEGJ
ABCEGJ
DEGJ
ADEGJ
BDEGJ
ABDEGJ
CDEGJ
ACDEGJ
BCDEGJ
ABCDEGJ
FGJ
AFGJ
BFGJ
ABFGJ
CFGJ
ACFGJ
BCFGJ
ABCFGJ
DFGJ
ADFGJ
BDFGJ
ABDFGJ
CDFGJ
ACDFGJ
BCDFGJ
ABCDFGJ
EFGJ
AEFGJ
BEFGJ
ABEFGJ
CEFGJ
ACEFGJ
BCEFGJ
ABCEFGJ
DEFGJ
ADEFGJ
BDEFGJ
ABDEFGJ
CDEFGJ
ACDEFGJ
BCDEFGJ
ABCDEFGJ
HJ
AHJ
BHJ
ABHJ
CHJ
ACHJ
BCHJ
ABCHJ
DHJ
ADHJ
BDHJ
ABDHJ
CDHJ
ACDHJ
BCDHJ
ABCDHJ
EHJ
AEHJ
BEHJ
ABEHJ
CEHJ
ACEHJ
BCEHJ
ABCEHJ
DEHJ
ADEHJ
BDEHJ
ABDEHJ
CDEHJ
ACDEHJ
BCDEHJ
ABCDEHJ
FHJ
AFHJ
BFHJ
ABFHJ
CFHJ
ACFHJ
BCFHJ
ABCFHJ
DFHJ
ADFHJ
BDFHJ
ABDFHJ
CDFHJ
ACDFHJ
BCDFHJ
ABCDFHJ
EFHJ
AEFHJ
BEFHJ
ABEFHJ
CEFHJ
ACEFHJ
BCEFHJ
ABCEFHJ
DEFHJ
ADEFHJ
BDEFHJ
ABDEFHJ
CDEFHJ
ACDEFHJ
BCDEFHJ
ABCDEFHJ
GHJ
AGHJ
BGHJ
ABGHJ
CGHJ
ACGHJ
BCGHJ
ABCGHJ
DGHJ
ADGHJ
BDGHJ
ABDGHJ
CDGHJ
ACDGHJ
BCDGHJ
ABCDGHJ
EGHJ
AEGHJ
BEGHJ
ABEGHJ
CEGHJ
ACEGHJ
BCEGHJ
ABCEGHJ
DEGHJ
ADEGHJ
BDEGHJ
ABDEGHJ
CDEGHJ
ACDEGHJ
BCDEGHJ
ABCDEGHJ
FGHJ
AFGHJ
BFGHJ
ABFGHJ
CFGHJ
ACFGHJ
BCFGHJ
ABCFGHJ
DFGHJ
ADFGHJ
BDFGHJ
ABDFGHJ
CDFGHJ
ACDFGHJ
BCDFGHJ
ABCDFGHJ
EFGHJ
AEFGHJ
BEFGHJ
ABEFGHJ
CEFGHJ
ACEFGHJ
BCEFGHJ
ABCEFGHJ
DEFGHJ
ADEFGHJ
BDEFGHJ
ABDEFGHJ
CDEFGHJ
ACDEFGHJ
BCDEFGHJ
ABCDEFGHJ
IJ
AIJ
BIJ
ABIJ
CIJ
ACIJ
BCIJ
ABCIJ
DIJ
ADIJ
BDIJ
ABDIJ
CDIJ
ACDIJ
BCDIJ
ABCDIJ
EIJ
AEIJ
BEIJ
ABEIJ
CEIJ
ACEIJ
BCEIJ
ABCEIJ
DEIJ
ADEIJ
BDEIJ
ABDEIJ
CDEIJ
ACDEIJ
BCDEIJ
ABCDEIJ
FIJ
AFIJ
BFIJ
ABFIJ
CFIJ
ACFIJ
BCFIJ
ABCFIJ
DFIJ
ADFIJ
BDFIJ
ABDFIJ
CDFIJ
ACDFIJ
BCDFIJ
ABCDFIJ
EFIJ
AEFIJ
BEFIJ
ABEFIJ
CEFIJ
ACEFIJ
BCEFIJ
ABCEFIJ
DEFIJ
ADEFIJ
BDEFIJ
ABDEFIJ
CDEFIJ
ACDEFIJ
BCDEFIJ
ABCDEFIJ
GIJ
AGIJ
BGIJ
ABGIJ
CGIJ
ACGIJ
BCGIJ
ABCGIJ
DGIJ
ADGIJ
BDGIJ
ABDGIJ
CDGIJ
ACDGIJ
BCDGIJ
ABCDGIJ
EGIJ
AEGIJ
BEGIJ
ABEGIJ
CEGIJ
ACEGIJ
BCEGIJ
ABCEGIJ
DEGIJ
ADEGIJ
BDEGIJ
ABDEGIJ
CDEGIJ
ACDEGIJ
BCDEGIJ
ABCDEGIJ
FGIJ
AFGIJ
BFGIJ
ABFGIJ
CFGIJ
ACFGIJ
BCFGIJ
ABCFGIJ
DFGIJ
ADFGIJ
BDFGIJ
ABDFGIJ
CDFGIJ
ACDFGIJ
BCDFGIJ
ABCDFGIJ
EFGIJ
AEFGIJ
BEFGIJ
ABEFGIJ
CEFGIJ
ACEFGIJ
BCEFGIJ
ABCEFGIJ
DEFGIJ
ADEFGIJ
BDEFGIJ
ABDEFGIJ
CDEFGIJ
ACDEFGIJ
BCDEFGIJ
ABCDEFGIJ
HIJ
AHIJ
BHIJ
ABHIJ
CHIJ
ACHIJ
BCHIJ
ABCHIJ
DHIJ
ADHIJ
BDHIJ
ABDHIJ
CDHIJ
ACDHIJ
BCDHIJ
ABCDHIJ
EHIJ
AEHIJ
BEHIJ
ABEHIJ
CEHIJ
ACEHIJ
BCEHIJ
ABCEHIJ
DEHIJ
ADEHIJ
BDEHIJ
ABDEHIJ
CDEHIJ
ACDEHIJ
BCDEHIJ
ABCDEHIJ
FHIJ
AFHIJ
BFHIJ
ABFHIJ
CFHIJ
ACFHIJ
BCFHIJ
ABCFHIJ
DFHIJ
ADFHIJ
BDFHIJ
ABDFHIJ
CDFHIJ
ACDFHIJ
BCDFHIJ
ABCDFHIJ
EFHIJ
AEFHIJ
BEFHIJ
ABEFHIJ
CEFHIJ
ACEFHIJ
BCEFHIJ
ABCEFHIJ
DEFHIJ
ADEFHIJ
BDEFHIJ
ABDEFHIJ
CDEFHIJ
ACDEFHIJ
BCDEFHIJ
ABCDEFHIJ
GHIJ