梦想种子

来个思路一般的：

@echo off
:loop
setlocal enabledelayedexpansion
:num
set /a t=!random!%%10
if defined %t% goto num
set %t%=ok
set n=%n%%t%
if "%n:~3%" == "" goto num
if %n% lss 1000 (endlocal&goto loop)
echo %n%
pause
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再来个效率超低的：

@echo off
:loop
setlocal enabledelayedexpansion
for /l %%i in (0,1,9) do set +!random!=%%i
for /f "skip=6 delims=" %%j in ('set +^|sort') do (
set t=%%j
set a=!a!!t:~-1!
)
if !a! lss 1000 (endlocal&goto loop)
echo !a!
pause
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