随笔分类 - CF
摘要：D. Ehab the Xorcist time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Given 2 integers uu a
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摘要：C. Game with Chips time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Petya has a rectangula
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摘要：D. Walk on Matrix time limit per test 2 seconds memory limit per test 512 megabytes input standard input output standard output Bob is playing a game
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摘要：C. Circle of Monsters time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are playing ano
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摘要：The sequence of mm integers is called the permutation if it contains all integers from 11 to mm exactly once. The number mm is called the length of th
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摘要：You are given sequence a1, a2, ..., an of integer numbers of length n. Your task is to find such subsequence that its sum is odd and maximum among all
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摘要：Mike and some bears are playing a game just for fun. Mike is the judge. All bears except Mike are standing in an n × m grid, there's exactly one bear
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摘要：Right now she actually isn't. But she will be, if you don't solve this problem. You are given integers n, k, A and B. There is a number x, which is in
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摘要：Vasya has a multiset ss consisting of nn integer numbers. Vasya calls some number xx nice if it appears in the multiset exactly once. For example, mul
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摘要：The on-board computer on Polycarp's car measured that the car speed at the beginning of some section of the path equals v1 meters per second, and in t
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摘要：Tanya wants to go on a journey across the cities of Berland. There are nn cities situated along the main railroad line of Berland, and these cities ar
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摘要：This is the easy version of this problem. The only difference is the constraint on kk — the number of gifts in the offer. In this version: k=2k=2. Vas
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摘要：Consider a sequence of digits of length 2k2k [a1,a2,…,a2k][a1,a2,…,a2k]. We perform the following operation with it: replace pairs (a2i+1,a2i+2)(a2i+1
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摘要：You are given a system of pipes. It consists of two rows, each row consists of nn pipes. The top left pipe has the coordinates (1,1)(1,1) and the bott
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摘要：It is the middle of 2018 and Maria Stepanovna, who lives outside Krasnokamensk (a town in Zabaikalsky region), wants to rent three displays to highlig
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摘要：Constanze is the smartest girl in her village but she has bad eyesight. One day, she was able to invent an incredible machine! When you pronounce lett
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摘要：Little penguin Polo has an n × m matrix, consisting of integers. Let's index the matrix rows from 1 to n from top to bottom and let's index the column
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摘要：You have a garland consisting of nn lamps. Each lamp is colored red, green or blue. The color of the ii-th lamp is sisi ('R', 'G' and 'B' — colors of
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摘要：Finally, a basketball court has been opened in SIS, so Demid has decided to hold a basketball exercise session. 2⋅n2⋅n students have come to Demid's e
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摘要：A number is called quasibinary if its decimal representation contains only digits 0 or 1. For example, numbers 0, 1, 101, 110011 — are quasibinary and
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