### Problems by YouKnowWho

 And... Yet Another AND ProblemYouKn0wWho has an integer n. He wants to find an integer sequence a of size exactly 2n such that 0≤a... Moderate 42/57/113 Ant-Man And The PolygonAnt-Man before escaping from the quantum realm thought about roaming around the realm. And much to h... Hard 14/15/23 Enormous ProductYou are given two integers l and r. You need to find the value of x=l∏r​x(x+1) As the value of this ... Moderate 5/9/17 FYou are given an integer sequence a1​,a2​,…,an​. For any non-negative integer k, let P(k)=l=1∏n​r=l,... Moderate 7/9/33 GiveawayCherry isn't feeling well right now as she found a problem that she couldn't solve. So she started t... Easy 263/298/474 Isn't It Strange?Cherry isn't feeling well right now as she found a problem that she couldn't solve. So she started t... Moderate 94/112/235 On the SeaCherry isn't feeling well right now as she found a problem that she couldn't solve. So she started t... Hard 15/16/25 Perfect PointsPerfect lines are the lines y=mx+c such that m and c are positive integers. Perfect points are the p... Moderate 10/33/74 Permutations and DivisorsLet P be a permutation of length n where each value from 1 to n occurs exactly once. A subsequence o... Moderate 72/83/226 Playing On A Directed GraphYou are given a directed graph consisting of n vertices and m edges (each edge is directed, so it ca... Moderate 36/50/195 String Is Not That EasyLet's consider a string S which is obtained by concatenating the non-negative integers from 0 to 102... Easy 219/232/348 Subset ANDYou are given an array A of n integers and an integer k. You need to find if there is any non-empty ... Moderate 141/165/326 The SelectionSUST has n departments numbered from 1 to n where every pair of distinct departments is connected by... Moderate 7/12/19 Where Do Lovers Go?Cherry isn't feeling well right now as she found a problem that she couldn't solve. So she started t... Moderate 193/291/761 XOR-GunYouKn0wWho has an integer sequence a1​,a2​,…,an​. He will perform the following operation until the ... Moderate 9/13/17 XOR PartitionNeo has a hidden array A of n integers where 0 ≤ Ai ≤ 109 is satisfied for each i from 1 to n . You ... Moderate 27/33/118 YouCherry isn't feeling well right now as she found a problem that she couldn't solve. So she started t... Moderate 5/9/17