牛客国庆集训派对Day4.B.异或求和(按位统计)
求给定$n$及序列$A_i$,求$$\sum_{i\lt j\lt k}(A_i\oplus A_j)(A_j\oplus A_k)(A_i\oplus A_k)$$
$n\leq10^5,\ A_i\leq10^9$。
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很久以前的奇怪但现在依旧成立的签名
attack is our red sun $$\color{red}{\boxed{\color{red}{attack\ is\ our\ red\ sun}}}$$ ------------------------------------------------------------------------------------------------------------------------
很久以前的奇怪但现在依旧成立的签名
attack is our red sun $$\color{red}{\boxed{\color{red}{attack\ is\ our\ red\ sun}}}$$ ------------------------------------------------------------------------------------------------------------------------