http://poj.org/problem?id=3099 树的重心:找到一个点,其所有的子树中最大的子树节点数最少,那么这个点就是这棵树的重心 求树的重心 如何在点中构造符合条件的树 得到树后 从任意一个点出发 dfs一次找到离这个点最远的点作为root1 在以root1出发 同样的方式求得root2 root1-root2就是这个树的直径 那么中心必然在这个直径上, 如果直径上点的个数是奇数的话那么 这个点就是重心 否则有两个重心 分别输出 #include <iostream> #in…

POJ 3286 How many 0's?(几多0?) Time Limit: 1000MS   Memory Limit: 65536K [Description] [题目描述] A Benedict monk No.16 writes down the decimal representations of all natural numbers between and including m and n, m ≤ n. How many 0's will he write down? 一个…

题目链接: PKU:http://poj.org/problem? id=3653 ZJU:problemId=1934" target="_blank">http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=1934 HDU:http://acm.hdu.edu.cn/showproblem.php? pid=2722 Description The Gorelians are a warlike rac…

Halloween treats Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 7644   Accepted: 2798   Special Judge Description Every year there is the same problem at Halloween: Each neighbour is only willing to give a certain total number of sweets…

Find a multiple Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 7192   Accepted: 3138   Special Judge Description The input contains N natural (i.e. positive integer) numbers ( N <= 10000 ). Each of that numbers is not greater than 15000…

The Pilots Brothers' refrigerator Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 22286   Accepted: 8603   Special Judge Description The game “The Pilots Brothers: following the stripy elephant” has a quest where a player needs to open a…

Flip Game Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 37427   Accepted: 16288 Description Flip game is played on a rectangular 4x4 field with two-sided pieces placed on each of its 16 squares. One side of each piece is white and the…

Corn Fields Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 9806   Accepted: 5185 Description 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 yumm…

Sum of Consecutive Prime Numbers Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 20050   Accepted: 10989 Description Some positive integers can be represented by a sum of one or more consecutive prime numbers. How many such representatio…

Tree Recovery Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 11939   Accepted: 7493 Description Little Valentine liked playing with binary trees very much. Her favorite game was constructing randomly looking binary trees with capital le…