combinations - Batch - Find Out Permutation -

i new batch , know if can find out combinations of numbers in order.

in case have 49 numbers 1 - 49 , , have pick 6 numbers results.

for example:

1 2 3 4 5 6  1 2 3 4 5 7  ... 1 2 3 4 5 49  1 2 3 4 6 7  1 2 3 4 6 8 

etc...

this old code:

@echo off > newfile & setlocal enabledelayedexpansion set a=44 set b=45 set c=46 set d=47 set e=48 set f=49 /l %%a in (1 1 !a!) ( /l %%b in (2 1 !b!) ( /l %%c in (3 1 !c!) ( /l %%d in (4 1 !d!) ( /l %%e in (5 1 !e!) ( /l %%f in (6 1 !f!) ( echo.%%a %%b %%c %%d %%e %%f  ))))))) >> newfile goto :eof 

however returns:

1 2 3 4 5 6 1 2 3 4 5 7 ... 1 2 3 4 5 49 1 2 3 4 6 6 

two 6's appeared.

i don't seem able fix it, please help, much!

when post question should post efforts solve it, describe method used , problems had; otherwise may similar answers no explanations @ all, one:

edit: users dbenham , aschipfl indicated, original code have small bug: set /a i=m-1 line should placed after :nextset label. right code:

@echo off setlocal enabledelayedexpansion  set "n=%1" set "m=%2"  set "line=" /l %%i in (1,1,%m%) (    set "c[%%i]=%%i"    set "line=!line! ^!c[%%i]^!" )  :nextset    set /a i=m-1    /l %%j in (!c[%m%]!,1,%n%) (       set "c[%m%]=%%j"       echo %line%    )     :nextpos    set "c=!c[%i%]!"    if %c% equ %n% (       set /a i-=1       if !i! equ 0 goto :eof       goto nextpos    )    /l %%i in (%i%,1,%m%) (       set /a c+=1,c[%%i]=c    )    if !c[%m%]! gtr %n% goto nextpos  goto nextset 

obviously, corrected code generate larger number of results , version particularly slow... :(

the new version below use exact same code of dbenham's solution; advantage may change parameters used generate result in easy way:

@echo off setlocal enabledelayedexpansion  set "n=%1" set "m=%2"  set /a j=n-m, prev=0 set "for=" & set "line=" & set "endfor=" /l %%i in (1,1,%m%) (    set /a j+=1    set "for=!for! set /a start=!prev!+1 & /l %%%%i in (^!start^!,1,!j!) ("    set "line=!line! %%%%i"    set "endfor=!endfor!)"    set "prev=%%%%i" ) rem echo !for! echo !line! %endfor% %for% echo %line% %endfor% 

output example:

c:\> test.bat 6 4  1 2 3 4  1 2 3 5  1 2 3 6  1 2 4 5  1 2 4 6  1 2 5 6  1 3 4 5  1 3 4 6  1 3 5 6  1 4 5 6  2 3 4 5  2 3 4 6  2 3 5 6  2 4 5 6  3 4 5 6 

to results, use: test.bat 49 6

2nd edit: faster method added

when problem solve excessive time process takes, obvious alternative use faster programming language. solution below use jscript, similar batch file programming:

@if (@codesection == @batch) @then  @echo off echo start: %time% cscript //nologo //e:jscript "%~f0" > result.txt echo end:   %time% goto :eof  @end  // jscript code section  ( var a=1; <= 44; ++a ) {    ( var b=a+1; b <= 45; ++b ) {       ( var c=b+1; c <= 46; ++c ) {          ( var d=c+1; d <= 47; ++d ) {             ( var e=d+1; e <= 48; ++e ) {                ( var f=e+1; f <= 49; ++f ) {                   wscript.echo(a,b,c,d,e,f);                }             }          }       }    } } 

this batch-jscript hybrid script; save .bat extension. program took little less 9 minutes in cheap-and-slow lap-top computer generate 239 mb file 13983816 lines.