77七

@echo off
set /a m=0
setlocal enabledelayedexpansion
for /l %%l in (1,1,990) do (
	set n=%%l
	if !n:~-1! equ 1 (
		set /a m+=1
		md "!m!\"
	)
	move "%%l.txt" "!m!\" 2>nul
)
endlocal
pause
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