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全部文章（共613篇）

C. Unusual Competitions

链接：https://codeforces.ml/contest/1323/problem/C A bracketed sequence is called correct (regular) if by inserting "+" and "1" you ...

2020-05-28

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C. Adding Powers

链接：https://codeforces.ml/contest/1312/problem/C Suppose you are performing the following algorithm. There is an array v1,v2,…,vnv1,v2,…,vn filled wit...

2020-05-28

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D. Count the Arrays

链接：https://codeforces.ml/contest/1312/problem/D Your task is to calculate the number of arrays such that: each array contains nn elements; each ...

2020-05-28

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E. Sleeping Schedule

链接：https://codeforces.ml/contest/1324/problem/E Vova had a pretty weird sleeping schedule. There are hh hours in a day. Vova will sleep exactly nn ti...

2020-05-28

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D. Pair of Topics

链接：https://codeforces.ml/contest/1324/problem/D The next lecture in a high school requires two topics to be discussed. The ii-th topic is interesting...

2020-05-28

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C 装备合成

链接：https://ac.nowcoder.com/acm/contest/4743/C 牛牛有{x}x件材料{a}a和{y}y件材料{b}b，用{2}2件材料{a}a和{3}3件材料{b}b可以合成一件装备，用{4}4件材料{a}a和{1}1件材料{b}b也可以合成一件装备。牛牛想要最大化合成...

2020-05-28

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D 取石子游戏

链接：https://ac.nowcoder.com/acm/contest/4743/D 小灰灰和小乔在玩取石子游戏，一堆石子有{n}n个石子，小灰灰和小乔轮流操作，小灰灰先手，每次操作的人可以进行以下操作：假设当前石子数量为{k}k，如果{k>=2}k>=2，那...

2020-05-28

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C. Ehab and Path-etic MEXs

链接：https://codeforces.ml/contest/1325/problem/C You are given a tree consisting of nn nodes. You want to write some labels on the tree's edges such t...

2020-05-28

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D. Ehab the Xorcist

链接：https://codeforces.ml/contest/1325/problem/D Given 2 integers uu and vv, find the shortest array such that bitwise-xor of its elements is uu, and ...

2020-05-28

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H 奇怪的背包问题增加了

链接：https://ac.nowcoder.com/acm/contest/4784/H 有一个容量为2^{30}230的背包，和m件物品，第i件物品的体积为c_ici，你需要从中选出若干件，使得选出的物品的体积恰好等于背包容量。这些物品有一个奇怪的特性，那就是c_i = 2^{k_i}ci...

2020-05-28

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