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>>

x << 1 == x*2
x << 2 == x*4
x << 4 == x*8

x >> 1 == x/2
x >> 2 == x/4
x >> 4 == x/8
??ㅋㅋㅋ

XOR swap

x^=y^=x^=y
.
XOR .

pragma once

#pragma . 까. . .
pragma once -



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