HBC237451L1-7拼接梯子,枚举,位运算Subsegments题解

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You are given an array of integers a1,a2,…,an and an integer xxx. Output the number of subsegments [l,r][l,r][l,r] where 1≤l≤r≤n1 le l le r le n1≤l≤r≤n such that alal+1…ar≡xmod998,244,353a_l cdot a_{l+1}cdot ldots cdot a_r equiv x mod 998,244,353alal+1…

You are given an array of integers a1,a2,…,ana_1,a_2,ldots,a_na1​,a2​,…,an​ and an integer xxx. Output the number of subsegments [l,r][l,r][l,r] where 1≤l≤r≤n1 le l le r le n1≤l≤r≤n such that al⋅al+1⋅…⋅ar≡xmod  998,244,353a_l cdot a_{l+1}cdot ldots cdot a_r equiv x mod 998,244,353al​⋅al+1​⋅…⋅ar​≡xmod998,244,353.

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标签： HBC237451L1-7拼接梯子 枚举 位运算Subsegments题解