dengyuli

这是我的，根据悬崖之树的代码改造而成，可以说是真正的抛物线了。
函数解析式：f(x)=-x2-1

@echo off
mode con lines=40 cols=80
setlocal enabledelayedexpansion
set ctr=0
set "spc= "
for %%a in (65 33 17 9 5 3 2 3 5 9 17 33 65) do (
 set /a ctr=ctr+4
 set ln=%%a
 for /l %%b in (1,1,!ln!) do (
  echo=
 )
 for /l %%b in (0,1,!ctr!) do (
  set "spc=!spc! "
 )
 echo !spc!O
 ping 127.1 -n 1 >nul
 ping 127.1 -n 1 >nul
 ping 127.1 -n 1 >nul
 set "spc= "
 if !ctr! gtr 56 goto:f
 cls
)
:f
pause>nul
exit
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