windows - 使用批处理重新排列数字

Question

在 Windows 命令行上，是否可以随机重新排列数字？

例如，我在批处理文件中有以下逻辑，它从 s 中随机选择数字。这是允许重复项目。我希望这些项目不重复。

@echo off

set i=
set s=12345678
set m=0
:loop
set /a n=%random% %% 8
call set i=%i%%%s:~%n%,1%%
set /a m=m+1
if not %m%==8 goto loop:
echo %i%

pause

实际输出：83254646

所需的输出类似于：83254176

谢谢，乔尔

Answer 1

这是 imo 更快（更好delayed expansion，我知道但不喜欢这里）：

@ECHO OFF &SETLOCAL
for /l %%a in (1 1 8) do call set "$%%random%%%%a=%%a"
for /f "tokens=2delims==" %%a in ('set "$"') do <nul set/p"=%%a"
echo(

---

@ECHO OFF &SETLOCAL
for /l %%a in (1 1 8) do call set "$%%random%%%%a=%%a"
for /f "tokens=2delims==" %%a in ('set "$"') do call set "line=%%line%%%%a"
echo(%line%

Answer 2

The following randomly selects a digit from the source string, and then removes that digit from the source. It avoids the relatively slow GOTO, and performs the minimum number of iterations.

@echo off
setlocal enableDelayedExpansion
set "s=12345678"
set "i="
for /l %%N in (8 -1 1) do (
  set /a "n1=!random! %% %%N, n2=n1+1"
  for /f "tokens=1,2" %%A in ("!n1! !n2!") do (
    set "i=!i!!s:~%%A,1!"
    set "s=!s:~0,%%A!!s:~%%B!"
  )
)
echo !i!
pause

Answer 3

您可以将已经完成的数字放入关联数组中：

@ECHO OFF &SETLOCAL
set "i="
set "s=12345678"
:loop
set /a n=%random% %% 8
if not defined $%n% (
    call set "i=%i%%%s:~%n%,1%%"
    set "$%n%=1"
)  else (
    goto:loop
)
set /a m+=1
if not %m%==8 goto:loop
echo %i%