Sum It Up Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 2982    Accepted Submission(s): 1493 Problem Description Given a specified total t and a list of n integers, find all distinct sums usin…

题目大意: 给你一个总和(total)和一列(list)整数,共n个整数,要求用这些整数相加,使相加的结果等于total,找出所有不相同的拼凑方法. 例如,total = 4,n = 6,list = [4,3,2,2,1,1]. 有四种不同的方法使得它们相加的结果等于total(即等于4),分别为:4,3+1,2+2, 2+1+1. 在同一种拼凑方式中,每个数字不能被重复使用,但是在list中可能存在许多相等的数字. 输入: 输入包含许多测试用例,每个用例仅占一行.每个用例包含t(total)…

传送门: http://acm.hdu.edu.cn/showproblem.php?pid=1258 Sum It Up Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 7758    Accepted Submission(s): 4067 Problem Description Given a specified total t a…

pid=1258">Sum It Up Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 3953    Accepted Submission(s): 2032 Problem Description Given a specified total t and a list of n integers, find all dist…

N皇后问题 Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Description 在N*N的方格棋盘放置了N个皇后,使得它们不相互攻击(即任意2个皇后不允许处在同一排,同一列,也不允许处在与棋盘边框成45角的斜线上. 你的任务是,对于给定的N,求出有多少种合法的放置方法.   Input 共有若干行,每行一个正整数N≤10,表示棋盘和皇后的数量:如果N=0,表示结束.   Output 共…

题目链接:http://poj.org/problem?id=1564 题目大意:给定一个整数t,和n个元素组成的集合.求能否用该集合中的元素和表示该整数,如果可以输出所有可行解.1<=n<=12 Sample Input 4 6 4 3 2 2 1 1 5 3 2 1 1 400 12 50 50 50 50 50 50 25 25 25 25 25 25 0 0 Sample Output Sums of 4: 4 3+1 2+2 2+1+1 Sums of 5: NONE Sums of…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 34799    Accepted Submission(s): 15411 Problem Description A ring is compose of n circles as shown in diagram. Put natural numb…

题意: 输入一棵树,判断这棵树在以节点1为根节点时,是否是一棵特殊的树. 相关定义: 1.  定义f[A, i]为树A上节点i到节点1的距离,父节点与子节点之间的距离为1. 2.  对于树A与树B,如果A与B的节点数相同,且无论i为何值,f[A, i]与f[B, i]都相等,则A与B为两棵相似的树. 3.  对于一棵树A,在以节点1为根节点的情况下,如果不存在与其它树与A相似,则A是一棵特殊的树. 输入: 包含多组输入样例. 每组输入样例中首先输入一个整数n,表示一棵含有n个节点的树. 接下来n…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1312 Red and Black Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 17773    Accepted Submission(s): 10826 Problem Description There is a rectangula…

Problem Description As we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math tasks to practice. There is one of them: For a tree T, let F(T,i) be the distance between vertice and vertice i.(The length of e…