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SPOJ QTREE - Query on a tree
Description You are given a tree (an acyclic undirected connected graph) with N nodes, and edges numbered 1, 2, 3...N-1. We will ask you to perfrom so
分类:其他好文   时间:2016-03-03 21:05:11    阅读次数:135
LeetCode Graph Valid Tree
原题链接在这里:https://leetcode.com/problems/graph-valid-tree/ 题目: Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair
分类:其他好文   时间:2016-03-03 13:02:17    阅读次数:172
lintcode-easy-Number of Islands
Given a boolean 2D matrix, find the number of islands. Given graph: [ [1, 1, 0, 0, 0], [0, 1, 0, 0, 1], [0, 0, 0, 1, 1], [0, 0, 0, 0, 0], [0, 0, 0, 0,
分类:其他好文   时间:2016-03-03 07:57:21    阅读次数:130
PAT 1021. Deepest Root (25)
1021. Deepest Root (25) A graph which is connected and acyclic can be considered a tree. The height of the tree depends on the selected root. Now you
分类:其他好文   时间:2016-03-02 22:08:53    阅读次数:229
bzoj3639: Query on a tree VII
Description You are given a tree (an acyclic undirected connected graph) with n nodes. The tree nodes are numbered from 1 to n. Each node has a color,
分类:其他好文   时间:2016-02-29 21:30:13    阅读次数:434
bzoj3637: Query on a tree VI
Description You are given a tree (an acyclic undirected connected graph) with n nodes. The tree nodes are numbered from 1 to n. Each node has a color,
分类:其他好文   时间:2016-02-29 21:22:40    阅读次数:224
UVA11387 - The 3-Regular Graph(推理)
题目链接 题意:给n个点,问能否画出一个无向图。且每一个顶点连接3条边。假设能够的话输出连接的边。 思路:当添加一条边时,总的无向图的度数会添加2,所以度数之和n*2为偶数。当n为奇数时,度数之和为奇数,所以不存在。当n为偶数时才符合条件。注意特判n为2时的情况。输出的话,就头尾相连,然后i与i+(
分类:其他好文   时间:2016-02-29 09:21:21    阅读次数:156
CodeForces 149D Coloring Brackets
区间DP。dp[i][j][h][k]表示[i,j]这段区间染色,左端点为颜色h,右端点为颜色k的方案数。 递推式很容易写出来。注意中间过程爆int。 #include<cstdio> #include<cmath> #include<cstring> #include<algorithm> #in
分类:其他好文   时间:2016-02-28 20:06:32    阅读次数:216
networkx学习笔记
编写检验网络的匹配特性的程序时,涉及到节点的强度(与节点相连边的权重和)这个概念,后才明白nx.degree()还有如此强大的功能。 直接上例子: import networkx as nxG=nx.Graph()G.add_edge(1,2, weight=1)G.add_edge(1,3, we
分类:Web程序   时间:2016-02-27 22:04:41    阅读次数:193
SPOJ QTREE 树链剖分
375. Query on a tree Problem code: QTREE You are given a tree (an acyclic undirected connected graph) with N nodes, and edges numbered 1, 2, 3...N-1.
分类:其他好文   时间:2016-02-27 17:55:11    阅读次数:151
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