Webcodeforces Mathematical Circus-div2-B 题意： 给定n，k。是否能把（1--n）的数分成符合条件的（a，b）对。 条件：（a+k）*b%4==0 解： 因为：原式=(a+k)*b≡0(mod 4) ab+b*k≡0(mod 4) 若k>=4,bk=b*(4t+k-4t)=4t*b+b*(k-4t) 上式有：ab+b*k≡ab+b*(k-4t)+b*4t≡ab+b*(k-4t)≡0(mod 4) 也就是说，我们只需要研究k=0,1,2,3的情 - 62042编程之家 WebAug 17, 2024 · B. Mathematical Circus. A new entertainment has appeared in Buryatia — a mathematical circus! The magician shows two numbers to the audience — nn and kk, where nn is even. Next, he takes all the integers from 11 to nn, and splits them all into pairs (a,b) (each integer must be in exactly one pair) so that for each pair the integer (a+k)⋅b ...

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WebAug 27, 2024 · CF1719B Mathematical Circus - Dry_ice - 博客园 题链： cf luogu 分类讨论思想。 Description 把 1 到 n 共 n 个整数分成 n 2 对有序数对 ( a i, b i) ，则对于 ∀ ( a i, b i), 4 ∣ ( a i + k) × b i 。 问合法方案是否存在，若存在给出一组合法方案。 Analysis 既然是与被 4 整除有关，那么我们可以对 4 这个数进行分析。 4 = 4 × 1 = 1 × 4 = 2 × 2 即三种情况，简 … WebAug 17, 2024 · Burenka and Tonya are playing an old Buryat game with a chip on a board of n \times m cells. At the beginning of the game, the chip is located in the lower left corner of the board. In one move, the player can move the chip to the right or up by any odd number of cells (but you cannot move the chip both to the right and up in one move). devilish one crossword

POJ - 2387 Til the Cows Come Home （Dijkstra模板题） - 豆奶特

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