## November Challenge 2020 SOLUTION CodeChef

Chegg FREE Premium Accounts: Free Premium Chegg Accounts & Passwords 2020 Udemy Leak Courses: [FREE] Learn Ethical Hacking From Scratch [FREE] Learn Network Hacking From Scratch (WiFi & Wired) November Challenge 2020 SOLUTION CodeChef Ada and Dishes SOLUTION ADADISH Iron Magnet and Wall SOLUTION FEMA2 Magical Candy Store SOLUTION CNDYGAME Unusual Queries SOLUTION UNSQUERS Red-Black Boolean Expression … Read more

## Restore Sequence SOLUTION RESTORE

Restore Sequence November Challenge 2020 Alice has a very complex machine ― when fed with a sequence A1,A2,…,AN, it produces a sequence B1,B2,…,BN, where for each valid i, Bi is the largest index j such that Ai divides Aj (since Ai divides itself, such an index always exist). For example, if the machine is fed … Read more

## Panic! at the Disco SOLUTION PANIC

Panic! at the Disco November Challenge 2020 You are given a K×K matrix M. For each r and c (1≤r,c≤K), let’s denote the element in the r-th row and c-th column by Mr,c. You are also given three integers N, a and d. Let’s define a K×K matrix S=∑i=0NFa+i⋅d⋅Mi. Here, M0 is the identity matrix … Read more

## Selecting Edges SOLUTION SELEDGE

Selecting Edges November Challenge 2020 You are given an undirected graph G with N vertices (numbered 1 through N) and M edges (numbered 1 through M). G does not contain any self-loops, but it may contain parallel edges. For each valid i, the i-th vertex has a non-negative integer weight Ai. Also, for each valid … Read more

## Connect on a Grid (Challenge) SOLUTION CONGRID

Connect on a Grid (Challenge) November Challenge 2020 You are given a grid with N rows (numbered 1 through N from top to bottom) and N columns (numbered 1 through N from left to right). Let’s denote a cell in the i-th row and the j-th column by (i,j). There are K checkpoints (numbered 1 … Read more

## Scalar Product Tree SOLUTION SCALSUM

Scalar Product Tree November Challenge 2020 Chef has a tree with N vertices (numbered 1 through N). The tree is rooted at the vertex 1. For each valid i, the weight of the i-th vertex is wi. For a vertex u with depth d (the root has depth 1), let’s denote the sequence of vertices … Read more

## Chef and the Combination Lock SOLUTION CHEFSSM

Chef and the Combination Lock November Challenge 2020 Chef has a combination lock with N wheels (numbered 1 through N). For each valid i, on the i-th wheel, the integers from 0 to Ai (inclusive) are written in ascending order (0 and Ai are also adjacent). Initially, one value on each wheel is selected uniformly … Read more

## Red-Black Boolean Expression SOLUTION RB2CNF

Red-Black Boolean Expression November Challenge 2020   Let S be a set of N boolean variables X1,X2,…,XN and their negations ¬X1,¬X2,…,¬XN. You are given the initial values of all variables. A 2-CNF boolean expression is defined as a conjunction of clauses, where each clause is a disjunction of two elements of the set S. Ada constructed … Read more

## Unusual Queries SOLUTION UNSQUERS

Unusual Queries November Challenge 2020 There are N mountains in Chefland, arranged in a line and numbered 1 through N from left to right. For each valid i, the i-th mountain from the left has a height Hi. Chef wants to choose a contiguous sequence of mountains l,l+1,…,r and visit them in this order. He has … Read more

## Magical Candy Store SOLUTION CNDYGAME

Magical Candy Store November Challenge 2020 Chef and Chefu are at a magical candy store playing a game with the following rules: There are two candy counters; each of them stores an infinite number of candies. At any time, only one of the counters is open and the other is closed. Exactly one player is … Read more

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