qixiaobin0715

参考3楼代码，这样效率要高些：

@echo off
set firstline=true
set m=0
setlocal enabledelayedexpansion
for /f "delims=" %%a in (test2.txt) do (
    set "str1=%%a"
    set "str2=!str1: =!
    if "%firstline%"=="true" (
        set firstline=false
        call :o
    ) else (
        for %%b in ("!m!") do if not "!str2:~%%b!"=="" call :o
    )
)
echo %longestline%
echo %m%
pause
goto :eof
:o
if not "!str2:~%m%!"=="" set /a m+=1&set longestline=%str1%&goto :o
goto :eof
复制代码