随笔分类 - 题库—Codeforces比赛
摘要：Ayoub thinks that he is a very smart person, so he created a function f(s)f(s) , where ss is a binary string (a string which contains only symbols "0"
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摘要：Dark is going to attend Motarack's birthday. Dark decided that the gift he is going to give to Motarack is an array aa of nn non-negative integers. Da
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摘要：You are given three strings aa , bb and cc of the same length nn . The strings consist of lowercase English letters only. The ii -th letter of aa is a
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摘要：Polycarp wants to assemble his own keyboard. Layouts with multiple rows are too complicated for him — his keyboard will consist of only one row, where
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摘要：Your company was appointed to lay new asphalt on the highway of length nn. You know that every day you can either repair one unit of the highway (lay
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摘要：You are given a string ss. Each character is either 0 or 1. You want all 1's in the string to form a contiguous subsegment. For example, if the string
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摘要：Guy-Manuel and Thomas have an array aa of nn integers [a1,a2,…,an ]. In one step they can add 11 to any element of the array. Formally, in one step th
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摘要：Anu has created her own function ff : f(x,y)=(x|y)−y where || denotes the bitwise OR operation. For example, f(11,6)=(11|6)−6=15−6=9. It can be proved
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摘要：题目描述 This problem differs from one which was on the online contest. The sequence a1,a2,...,an a_{1},a_{2},...,a_{n} a1,a2,...,an is called increasi
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摘要：There are nn monsters standing in a row numbered from 11 to nn . The ii -th monster has hihi health points (hp). You have your attack power equal to a
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摘要：There is a robot on a coordinate plane. Initially, the robot is located at the point (0,0)(0,0) . Its path is described as a string ss of length nn co
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摘要：Mishka wants to buy some food in the nearby shop. Initially, he has ss burles on his card. Mishka can perform the following operation any number of ti
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摘要：You are given an array aa consisting of nn integers. In one move, you can choose two indices 1≤i,j≤n1≤i,j≤n such that i≠ji≠j and set ai:=ajai:=aj . Yo
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摘要：You are given two integers nn and mm . Calculate the number of pairs of arrays (a,b)(a,b) such that: the length of both arrays is equal to mm ; each e
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摘要：Oh, New Year. The time to gather all your friends and reflect on the heartwarming events of the past year... nn friends live in a city which can be re
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摘要：There are nn friends who want to give gifts for the New Year to each other. Each friend should give exactly one gift and receive exactly one gift. The
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摘要：There are nn Christmas trees on an infinite number line. The ii -th tree grows at the position xixi . All xixi are guaranteed to be distinct. Each int
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