@echo off 
setlocal enabledelayedexpansion
set /a m=0
for /f "delims=" %%a in (1.txt) do (
set /a n=0
set aa=%%a
set bb=!aa: =!
if "!bb!" neq "" (
set /a n+=1
set bb=!bb:~1!
)
if !n! gtr !m! (
set shuchu=!aa!
set m=!n!
) 
)
echo !shuchu!
pause
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@echo off 
setlocal enabledelayedexpansion
set /a m=0
for /f "delims=" %%a in (1.txt) do (
set /a n=0
set aa=%%a
set bb=!aa: =!
call :11
)
echo !shuchu!
pause

:11
if "!bb!" neq "" (
set /a n+=1
set bb=!bb:~1!
goto 11
)
if !n! gtr !m! (
set shuchu=!aa!
set m=!n!
) 
goto :eof
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@echo off
set /a LineNum = 0, MaxLen = 0, n = 0
for /f "delims=" %%a in (1.txt) do (
   set /a LineNum += 1
   set s=%%a#
   setlocal enabledelayedexpansion
    for %%a in (4096 2048 1024 512 256 128 64 32 16 8 4 2 1) do (
        if "!s:~%%a,1!" neq "" (
            set /a n += %%a
            set s=!s:~%%a!
        )
    )
    if !n! gtr !MaxLen! (
        for %%n in (!n!) do (
            endlocal
            set MaxLen=%%n
            set str=%%a
        )
    ) else endlocal
)

set LineNum
set MaxLen
set str
pause
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@echo off&setlocal enabledelayedexpansion
set f=....
for /l %%a in (0 1 9) do set f=!f!!f!
set f=!f!!f:~-4093!
::创建一个长度为8189的变量f，日后作为文件名以及findstr通配符出现
 
copy 1.txt !f:~-125!.$
findstr .* *.$>$
::sort /rec开关至少要128个字符才起效的限制，所以为1.txt中的内容凑够128个字符的前缀

set n=8192
for %%a in (4096 2048 1024 512 256 128 64 32 16 8 4 2 1) do (
        sort /rec !n! $&&set /a n-=%%a||set /a n+=%%a
)>nul 2>nul
set /a n=n-128
::判断最长行字符数

findstr /x "!f:~-%n%!" 1.txt
::查找最长行，但是因为findstr匹配的是字节，所以碰到存在宽字符的文件，还是老老实实遍历吧

del *.$
pause
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