慕夜蓝化

@echo off&setlocal enabledelayedexpansion
set/a a=0,n=300,v+=1
for /f "delims=" %%i in (a.txt) do (
    set/a a+=1
    if !a! leq !n! (>>!v!.txt echo,%%i) else (set/a n+=300,v+=1&>>!v!.txt echo,%%i)
)
pause
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