题意:有很多棍子,从棍子中选出两个棍子集合,使他们的和相等,求能取得的最多棍子数. 解法:容易看出有一个多阶段决策的过程,对于每个棍子,我们有 可以不选,或是选在第一个集合,或是选在第二个集合 这三种决策.因为两个集合最后的和要相等,那么令一个集合为正,另一个为负,那么最后和为0,我们用偏移0的量来作为状态之一. dp[i][j]表示前 i 个 偏移量为 j 的最大棍子数,因为每根棍最长为200,所以偏移量最多为+-20000,所以在+-20000之间枚举,最多100*40000 代码: #in…

Rectangular Polygon Time Limit: 1000MS   Memory Limit: 256000KB   64bit IO Format: %lld & %llu Description A rectangular polygon is a polygon whose edges are all parallel to the coordinate axes. The polygon must have a single, non-intersecting bounda…

pid=5647">[HDU 5647]DZY Loves Connecting(树DP) DZY Loves Connecting Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others) Total Submission(s): 332    Accepted Submission(s): 112 Problem Description DZY has an unroote…

id=3140">[POJ 3140] Contestants Division(树型dp) Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 9121   Accepted: 2623 Description In the new ACM-ICPC Regional Contest, a special monitoring and submitting system will be set up, and stud…

[POJ 2486] Apple Tree(树型dp) Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8981   Accepted: 2990 Description Wshxzt is a lovely girl. She likes apple very much. One day HX takes her to an apple tree. There are N nodes in the tree. Each…

Time Limit: 6000/2000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4487 Accepted Submission(s): 2209 Problem Description A number of rectangular posters, photographs and other pictures of the same shape are pasted o…

1      模式简介 模版方法模式的定义: 模版方法模式在一个方法中定义一个算法的骨架,而将一些步骤延迟到子类中.模版方法使得子类可以在不改变算法结构的情况下,重新定义算法中的某些步骤. 模版方法模式的优点: 1)        封装不变部分,扩展可变部分: 2)        提取公共代码,便于维护: 3)        行为由父类控制,子类实现. 模版方法模式的缺点: 每一个不同的实现都需要一个子类来实现,导致类的个数增加,使得系统更加庞大. 模版方法模式的适用场景: 1)        …

time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output Little girl Alyona is in a shop to buy some copybooks for school. She study four subjects so she wants to have equal number of copybooks for each…

time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output Vanya has a scales for weighing loads and weights of masses w0,?w1,?w2,?-,?w100 grams where w is some integer not less than 2 (exactly one weight…

time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output Gennady is one of the best child dentists in Berland. Today n children got an appointment with him, they lined up in front of his office. All chi…