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                                        转自： https://blog.youkuaiyun.com/xs18952904/article/details/80504296真的还有很长的路要走啊！题目It is the middle of 2018 and Maria Stepanovna, who lives outside Krasnokamensk (a tow...

D. XOR-pyramidtime limit per test2 secondsmemory limit per test512 megabytesinputstandard inputoutputstandard outputFor an array bb of length mm we define the function ff asf(b)={b[1]if m=1f(b[1]⊕b[2]...

                                                  http://codeforces.com/problemset/problem/864/E olycarp is in really serious trouble — his house is on fire! It's time to save the most valuable items...

There is going to be a party to celebrate the 80-th Anniversary of the Ural State University. The University has a hierarchical structure of employees. It means that the supervisor relation forms a tr...

Bob enjoys playing computer games, especially strategic games, but sometimes he cannot find the solution fast enough and then he is very sad. Now he has the following problem. He must defend a medieva...

After Farmer John realized that Bessie had installed a "tree-shaped" network among his N (1 <= N <= 10,000) barns at an incredible cost, he sued Bessie to mitigate his losses.  Bessie, feeling v...

Farmer John has purchased a lush new rectangular pasture composed of M by N (1 ≤ M ≤ 12; 1 ≤ N ≤ 12) square parcels. He wants to grow some yummy corn for the cows on a number of squares. Regrettably, ...