CF. 765F. Souvenirs(主席树)
给定长为$n$的序列$A_i$。$m$次询问，每次给定$l,r$，求$\min_{l\leq i,j\leq r,i\neq j}|A_i-A_j|$。
$n\leq10^5,\ m\leq3\times10^5$。
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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 $$\color{red}{\boxed{\color{red}{attack\ is\ our\ red\ sun}}}$$ ------------------------------------------------------------------------------------------------------------------------
