Problem Description I have N precious stones, and plan to use K of them to make a necklace for my mother, but she won't accept a necklace which is too heavy. Given the value and the weight of each precious stone, please help me find out the most valu…

HDOJ(HDU).2660 Accepted Necklace (DFS) 点我挑战题目 题意分析 给出一些石头,这些石头都有自身的价值和重量.现在要求从这些石头中选K个石头,求出重量不超过W的这些石头的最大价值是多少? 类似于之前讨论到的数字选不选的问题,此处面临的情况是石头选不选,若选进行一个dfs,若不选择进行另外一个dfs.考虑递归边界: 1.当选够了K个的时候,终止递归: 2.当当前重量大于W的时候,终止递归: 3.当所选石头的下标(代码中的pos)超过石头数量的时候,终止递归: 若…

题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=2660 Accepted Necklace Description I have N precious stones, and plan to use K of them to make a necklace for my mother, but she won't accept a necklace which is too heavy. Given the value and the weight…

Accepted Necklace Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2474    Accepted Submission(s): 973 Problem Description I have N precious stones, and plan to use K of them to make a necklace f…

排列2 Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5817    Accepted Submission(s): 2229 Problem Description Ray又对数字的列产生了兴趣:现有四张卡片,用这四张卡片能排列出很多不同的4位数,要求按从小到大的顺序输出这些4位数.   Input 每组数据占一行,代表四张卡片上的数…

题目链接 Problem Description There is a tree with n nodes, each of which has a type of color represented by an integer, where the color of node i is ci. The path between each two different nodes is unique, of which we define the value as the number of di…

Oil Deposits Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 65536/32768K (Java/Other) Total Submission(s) : 4   Accepted Submission(s) : 3 Font: Times New Roman | Verdana | Georgia Font Size: ← → Problem Description The GeoSurvComp geologic s…

Counting Cliques Time Limit: 8000/4000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1855    Accepted Submission(s): 735 Problem Description A clique is a complete graph, in which there is an edge between every pai…

题目网址:http://acm.hdu.edu.cn/showproblem.php?pid=1728 题目: 逃离迷宫 Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 27324    Accepted Submission(s): 6684 Problem Description 给定一个m × n (m行, n列)的迷宫,迷宫中有两…

思路:一开始对k没有理解好,题意说交换k次,如果我们不需要交换那么多,那么可以重复自己交换自己,那么k其实可以理解为最多交换k次.这道题dfs暴力就行,我们按照全排列最大最小去找每一位应该和后面哪一位交换.k = 0没判断好WA了2发... 如果k >= len - 1,那么最大最小就是直接sort非前导零的答案.如果k < len - 1,那么我们交换肯定从最大位数交换,比如现在求最大值,那么我们从第一位依次判断,如果该位不是他后面最大的,那么就和后面最大的交换(如果最大的有多个,那么就每个…