摘要： D. Harry Potter and the Sorting Hattime limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputAs you know, Hogwarts has four houses: Gryffindor, Hufflepuff, Ravenclaw and Slytherin. The sorting of the first-years into houses is done by the Sorting Hat. The 阅读全文

摘要： touring computeTime Limit 1000msMemory Limit 65536KdescriptionThe best friends Mr. Li and Mr. Liu are touring in beautiful country M. M has n cities and m two-way roads in total. Each road connects two cities with fixed length.We assume that the cost of car traveling on the road is only related ... 阅读全文

摘要： monkeyTime Limit 1000msMemory Limit 65536Kdescription Cc is a lovely monkey. It likes to play the game "catching plates". The game is as follows. There are n pegs in a line numbered from 1 to n. Cc stands on the first peg at the beginning. It is rather hard for Cc to jump from peg i to peg 阅读全文

摘要： 素数树Time Limit 1000msMemory Limit 65536KdescriptionSuppose there is a tree named A. All nodes of A have a weight v(0 < v < 4000000).Now, we will give the definition of "Prime Node".A node is a Prime Node if the following conditions are satisfied.The subtree of A whose root node is b w 阅读全文