println("Hello World?")
(1) (-1e10) (0xabcdef) 'y'
[x] x->y x.y
!x x.inv() x*y x&y
x*y x/y x%y
x+y x-y
a shl b
x<y x<=y x>y x>=y
x==y x!=y x===y
x and y
x^y
x or y
x&&y x||y
x=y x+=y x-=y x*=y x/=y x%=y x<<=y x>>=y x&=y x^=y x|=y
a+=b c=d e<=f g>=h i/j k%l m<<n o>>p q&r s^t u|v
a<=b
a|b a&b
x,y
--a!=--b
a++!=++b
0xFF_E1_DE_5E 0b100_100 200_000
a===b
a!=b
_33.find(arr)
X.find()
X.f+1
X.u+2
a..b
a?:b
.32_00_446