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https://codeforces.ml/contest/1457/problem/DArkady owns anon-decreasingarraya1,a2,…,ana1,a2,…,an. You are jealous of its beauty and want to destroy this property. You have a so-calledXOR-gunthat you can use one or more times.In one step you can se...

https://codeforces.ml/contest/1447/problem/CYou have a knapsack with the capacity ofWW. There are alsonnitems, theii-th one has weightwiwi.You want to put some of these items into the knapsack in such a way that their total weightCCis at least h...

https://codeforces.ml/contest/1437/problem/DMonocarp had a tree which consisted ofnnvertices and was rooted at vertex11. He decided to study BFS (Breadth-first search), so he ran BFS on his tree, starting from the root. BFS can be described by the fol...

https://codeforces.ml/contest/1445/problem/COleg's favorite subjects are History and Math, and his favorite branch of mathematics is division.To improve his division skills, Oleg came up withttpairs of integerspipiandqiqiand for each pair decided...

链接：https://codeforces.ml/contest/1365/problem/CAfter the mysterious disappearance of Ashish, his two favourite disciples Ishika and Hriday, were each left with one half of a secret message. These messages can each be represented by a permutation of size.

链接：https://codeforces.ml/contest/1350/problem/DSlime has a sequence of positive integersa1,a2,…,ana1,a2,…,an.In one operation Orac can choose an arbitrary subsegment[l…r][l…r]of this sequence and replace all valuesal,al+1,…,aral,al+1,…,arto the va...

链接：https://codeforces.ml/contest/1335/problem/DYou are given a correct solution of the sudoku puzzle. If you don't know what is the sudoku, you can read about ithere.The picture showing the corre...

链接：https://codeforces.ml/contest/1321/problem/BTanya wants to go on a journey across the cities of Berland. There arenncities situated along the main railroad line of Berland, and these cities are...

链接：https://codeforces.ml/contest/1180/problem/BNick had received an awesome array of integersa=[a1,a2,…,an]a=[a1,a2,…,an]as a gift for his55birthday from his mother. He was already going to expl...

链接：https://codeforces.ml/contest/1189/problem/D1Note that this is the first problem of the two similar problems. You can hack this problem only if you solve both problems.You are given a tree with...

链接：https://codeforces.ml/contest/1185/problem/C2The only difference between easy and hard versions is constraints.If you write a solution in Python, then prefer to send it in PyPy to speed up exec...