netbenton

取到一个剔除一个

@echo off&setlocal enabledelayedexpansion
set "str=a b c d e f g h i j k l m n o p q r s t u v w x y z "
for %%i in (%str%) do (set/a #+=1,%%i=#)
for /l %%a in (1,1,10) do (
    set/a asc=!random!%%#*2,#-=1
    for %%b in (!asc!) do (set asc=!str:~%%b,1!)
    for %%b in (!asc!) do (set str=!str:%%b =!&set/a $=!random!%%2,1/$ 2>nul||set asc=!%%b!)
    echo !asc!
)
pause
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netbenton

测试了一下，“||”管道操作虽然要比其它管道操作快，但是比起if还是要慢好多，相当于if 用时的5~8倍。
改为用if 判断。综合测度速度不错。

@echo off&setlocal enabledelayedexpansion
set "str=a b c d e f g h i j k l m n o p q r s t u v w x y z "
for %%i in (%str%) do (set/a #+=1,%%i=#)
for /l %%a in (1,1,10) do (
    set/a asc=!random!%%#*2,#-=1
    for %%b in (!asc!) do (set asc=!str:~%%b,1!)
    for %%b in (!asc!) do (set str=!str:%%b =!&set/a $=!random!%%2&if !$! equ 0 set asc=!asc!)
    echo !asc!
)
pause
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