ccr438758900

第一题
@echo off
setlocal enabledelayedexpansion
for /f "delims=" %%i in (1.txt) do (set a=%%i
if "!a:~0,4!"=="abcd" (echo !b!&echo %%i)
set b=%%i)
pause 
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第二题
@echo off
setlocal enabledelayedexpansion
for /f "delims=" %%i in (1.txt) do (
if !a!==b (echo !c!&echo !d!&echo %%i&set a=)
set w=%%i&if "!w:~0,4!"=="abcd" (set a=b)
if !a!==b (set d=%%i) else (set c=%%i)
)
pause
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