随笔分类 - 题库—Codeforces比赛
摘要：题目描述 You are given a correct solution of the sudoku puzzle. If you don't know what is the sudoku, you can read about it here. The picture showing the
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摘要：题目描述 You have n n n students under your control and you have to compose exactly two teams consisting of some subset of your students. Each student had
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摘要：题目描述 You are given three positive integers n n n , a a a and b b b . You have to construct a string s s s of length n n n consisting of lowercase Lati
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摘要：题目描述 There are two sisters Alice and Betty. You have n n n candies. You want to distribute these n n n candies between two sisters in such a way that:
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摘要：You have an array aa of length nn . For every positive integer xx you are going to perform the following operation during the xx -th second: Select so
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摘要：You have array of nn numbers a1,a2,…,ana1,a2,…,an . Rearrange these numbers to satisfy |a1−a2|≤|a2−a3|≤…≤|an−1−an||a1−a2|≤|a2−a3|≤…≤|an−1−an| , where
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摘要：You have integer nn. Calculate how many ways are there to fully cover belt-like area of 4n−24n−2 triangles with diamond shapes. Diamond shape consists
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摘要：You are given a complete directed graph KnKn with nn vertices: each pair of vertices u≠vu≠v in KnKn have both directed edges (u,v)(u,v) and (v,u)(v,u)
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摘要：You are playing another computer game, and now you have to slay nn monsters. These monsters are standing in a circle, numbered clockwise from 11 to nn
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摘要：Many years ago Berland was a small country where only nn people lived. Each person had some savings: the ii -th one had aiai burles. The government co
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摘要：output standard output Polycarp has recently created a new level in this cool new game Berlio Maker 85 and uploaded it online. Now players from all ov
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摘要：Eugene likes working with arrays. And today he needs your help in solving one challenging task. An array cc is a subarray of an array bb if cc can be
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摘要：Once again, Boris needs the help of Anton in creating a task. This time Anton needs to solve the following problem: There are two arrays of integers a
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摘要：Young boy Artem tries to paint a picture, and he asks his mother Medina to help him. Medina is very busy, that's why she asked for your help. Artem wa
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摘要：Dreamoon likes coloring cells very much. There is a row of nn cells. Initially, all cells are empty (don't contain any color). Cells are numbered from
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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：Dreamoon is a big fan of the Codeforces contests. One day, he claimed that he will collect all the places from 11 to 5454 after two more rated contest
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摘要：Word ss of length nn is called kk -complete if ss is a palindrome, i.e. si=sn+1−isi=sn+1−i for all 1≤i≤n1≤i≤n ; ss has a period of kk , i.e. si=sk+isi
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摘要：A positive integer is called composite if it can be represented as a product of two positive integers, both greater than 11 . For example, the followi
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摘要：Alice has a cute cat. To keep her cat fit, Alice wants to design an exercising walk for her cat! Initially, Alice's cat is located in a cell (x,y)(x,y
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