## CODECHEF September Lunchtime 2020 SOLUTIONS

CODECHEF September Lunchtime 2020 DIV 1 & 2 SOLUTIONS Watermelon SOLUTION WATMELON GCD operations SOLUTION GCDOPS Root the Tree SOLUTION ROOTTREE Robot Detector SOLUTION UKROBOT Permutation Split SOLUTION PERMSPL Few Different Elements SOLUTION FEWDIFF Adding on Segments SOLUTION ADDONSEG   ESET FREE LINCENSE KEYS UPDATED 2020 : https://www.cybergeeksquad.co/2020/11/eset-free-lincense-keys-updated-2020.htmlChegg FREE Premium Accounts: Free Premium Chegg Accounts & Passwords 2020 … Read more

## Adding on Segments SOLUTION ADDONSEG

Adding on Segments SOLUTION ADDONSEG There are N integers A1,A2,…,AN on a circle. For each valid i, Ai and Ai+1 are adjacent; A1 and AN are also adjacent. Chef has a sequence of integers B1,B2,…,BN, which he may use to perform any number of operations (including zero). In one operation, he should do the following: … Read more

## Few Different Elements SOLUTION FEWDIFF

Few Different Elements SOLUTION FEWDIFF Let’s call a sequence with length K good if there are at most K2+1 distinct elements in it. For example, the sequence (3,3,2,1,3) is good, since it contains 3≤52+1 distinct elements, while the sequence (1,4,8,8,2) is not good, since it contains 4>52+1 distinct elements.   You are given a sequence … Read more

## Permutation Split SOLUTION PERMSPL

Permutation Split SOLUTION PERMSPL For a sequence of positive integers [Math Processing Error], let’s define the number of inversions in it as the number of pairs of integers [Math Processing Error] such that [Math Processing Error] and [Math Processing Error]. You are given a permutation [Math Processing Error] of the integers [Math Processing Error] through … Read more

## Robot Detector SOLUTION UKROBOT

Robot Detector SOLUTION UKROBOT There is a robot in the cell [Math Processing Error] of an infinite grid. One cell [Math Processing Error] contains an obstacle and all other cells are free. We only know that [Math Processing Error] and [Math Processing Error], but not the exact location of the obstacle. You may give the … Read more

## Root the Tree SOLUTION ROOTTREE

Root the Tree SOLUTION ROOTTREE A directed tree is a directed graph such that if all edges were undirected, this graph would be a tree. A rooted directed tree is a directed tree in which there is one vertex (the root, let’s denote it by [Math Processing Error]) such that it is possible to reach … Read more

## GCD operations SOLUTION GCDOPS

GCD operations SOLUTION GCDOPS Consider a sequence [Math Processing Error], where initially, [Math Processing Error] for each valid [Math Processing Error]. You may perform any number of operations on this sequence (including zero). In one operation, you should choose two valid indices [Math Processing Error] and [Math Processing Error], compute the greatest common divisor of … Read more

## Watermelon SOLUTION WATMELON

Watermelon SOLUTION WATMELON You have a sequence of integers [Math Processing Error]. You may perform any number of operations on this sequence (including zero). In one operation, you should choose a valid index [Math Processing Error] and decrease [Math Processing Error] by [Math Processing Error]. Can you make the sequence good using these operations?   … Read more

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