mxxcgzxxx

做个简单的，试试

@echo off&setlocal enabledelayedexpansion
set /p a=请输入组合元素：
set "str=%a%"
set /a max=8190,min=0
for /l %%a in (1,1,14) do (
     set /a "num=(max+min)/2"
     for /f "delims=" %%b in ("!num!") do if "!str:~%%b!" equ "" (set /a max=num) else set /a min=num
)
if "!str:~%num%!" neq "" set /a num+=1
:1
set /p b=您需要组合的字数：
set d=0
set "m="
:2
set /a c=!random!%%%num%
set m=%m%!a:~%c%,1!
set /a d+=1
if %d%==%b% goto :3
goto :2
:3
echo %m%
pause
goto :1
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