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DP Intro - Tree DP Examples
因为上次比赛sb地把一道树形dp当费用流做了,受了点刺激,用一天时间稍微搞一下树形DP,今后再好好搞一下) 基于背包原理的树形DP poj 1947 Rebuilding Roads 题意:给你一棵树,让你求最少剪掉多少条边可以剪出一棵点数为m的子树. 解法:dp[i][j]表示i节点得到j个节点的 ...
分类:其他好文   时间:2017-05-26 18:56:32    阅读次数:274
(最小生成树)Codeforces 76 A Gift
The kingdom of Olympia consists of N cities and M bidirectional roads. Each road connects exactly two cities and two cities can be connected with more ...
分类:其他好文   时间:2017-05-26 00:42:36    阅读次数:283
POJ题目1947 Rebuilding Roads(树形dp)
Rebuilding Roads Time Limit: 1000MS Memory Limit: 30000K Total Submissions: 9957 Accepted: 4537 Description The cows have reconstructed Farmer John's ...
分类:其他好文   时间:2017-05-21 16:02:14    阅读次数:168
HDU 2586 How far away ?(LCA模板 近期公共祖先啊)
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2586 Problem Description There are n houses in the village and some bidirectional roads connecting them ...
分类:其他好文   时间:2017-05-21 09:59:42    阅读次数:242
POJ 3352 Road Construction
It's almost summer time, and that means that it's almost summer construction time! This year, the good people who are in charge of the roads on the tr ...
分类:其他好文   时间:2017-05-20 22:34:40    阅读次数:237
pat-1087【最短路径】
近期一次pat考试中的最后一题。事实上玩算法这东西就像打魔兽。不能光有思想上的高度,微操必须实打实。就这么个迪杰斯特拉算法。多少教科书上都讲烂了。可是现场又有多少人是敲对的呢?不能光停留在理解上。必须能用自己的方式表达出来才算过关。 题目: 1087. All Roads Lead to Rome ...
分类:其他好文   时间:2017-05-15 19:46:36    阅读次数:233
2017-5-2-Train:Codeforces Round #323 (Div. 2)
A. Asphalting Roads(模拟) City X consists of n vertical and n horizontal infinite roads, forming n?×?n intersections. Roads (both vertical and horizonta ...
分类:其他好文   时间:2017-05-08 21:59:49    阅读次数:194
poj 2421 Constructing Roads
Constructing Roads Description There are N villages, which are numbered from 1 to N, and you should build some roads such that every two villages can ...
分类:其他好文   时间:2017-05-08 10:10:02    阅读次数:203
POJ2421 Constructing Roads
Constructing Roads 这道题很水,就是一个裸的最小生成树,最不过把已经连接的节点的值再设为0。 代码: 1 #include<cstdio> 2 #include<cstring> 3 #define N 1010 4 int dis[N][N],minn[N],n,m,a,b; 5 ...
分类:其他好文   时间:2017-05-07 21:58:58    阅读次数:104
POJ 2421 Constructing Roads
最小生成树问题。 Kruskal。假设已经有边就合并。 然后找最小。没有坑点。 G++ AC。 #include<cstdio> #include<cstring> #include<queue> #include<algorithm> #include<queue> #include<map> # ...
分类:其他好文   时间:2017-05-07 21:15:09    阅读次数:139
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