is there an ANSI (either C or C++) library around that implements
common graph algorithms?
any pointer is appreciated.
thanks in advance.
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how to find all cut vertexes in a given graph ??
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how to find all cut vertexes in a given graph ??
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@mac - yeah you were right.
Normally we number the vertices and forget about their co-ordinates in
programming :)
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Hi,
You can construct a BFS tree. Then if there are two non-tree edges with a
common vertex, I think there will be a nested loop at that vertex.
There might not be any common edges in the nested loop too.
I hope this makes sense.
On Wed, Aug 31, 2011 at 10:51 PM, MAC wrote:
> @mohit : i disagr
@mohit : i disagree.. precisely bcoz of the reason you cited we can only
check common nodes between cycles and nothing else .. please correct me if i
am wrong
On Wed, Aug 31, 2011 at 9:34 PM, mohit verma wrote:
> @ MAC , i think it was not right to inspect common nodes in different
> cycles.
>
>
@ MAC , i think it was not right to inspect common nodes in different
cycles.
say in the above picture the two inner nodes of inner cycle are out side
the bigger cycle (towards A) then co-ordinates of the inner cycle will
change and no cycle nested but having common nodes.
On Wed, Aug 31, 2011
it was loops sharing common edges ,, (i said find all cycles and see if
there is some cycles having coomon nodes between them and he was not happy
)
On Wed, Aug 31, 2011 at 8:54 PM, Piyush Grover wrote:
> loop within a loop, what exactly that means??
> Nee to consider the planarity or two loop
loop within a loop, what exactly that means??
Nee to consider the planarity or two loops sharing common edge/s??
On Wed, Aug 31, 2011 at 8:46 PM, MAC wrote:
> Q The question asked in interview of a startup : suppose you have a graph
> as shown bellow : please see the attachment . The red dots
Q The question asked in interview of a startup : suppose you have a graph
as shown bellow : please see the attachment . The red dots are graph
vertexes ( you can see 1 vertex alone , aloof )
so you can see there are 2 cycles one inside another . How will you find
such a scenario in a graph i.e. a
all graph problem need not use tree . most of them can be implemented using
array .
On Tue, Jul 26, 2011 at 3:11 PM, Dipankar Patro wrote:
> Love your idea Navneet, but I have seen in general that Graph algos are
> difficult to convert into code (at least for me!) May be that's the reason
> why
Love your idea Navneet, but I have seen in general that Graph algos are
difficult to convert into code (at least for me!) May be that's the reason
why people are not discussing it here.
But like you pointed out we could at least point the scenarios where graph
algos can be applied. Looking forward
Hello folks,
I have seen some of the best possible string/array/tree based problems being
discussed on this thread but somehow i feel this group has been little
partial towards Graph problems.
Though, in most cases, interviewers don't ask Graph algorithms, but we, as
algo lovers, should give due
Given a distribution of packages on media and a list of dependences
between packages, you have to calculate the minimal number of media
changes required to install all packages. For your convenience, you
may assume that the operating system comes on exactly 2 DVDs.
http://www.spoj.pl/problems/ALL/
I have the following graph problem. I would appreciate if some graph
theory expert points me to what is the scientific name under which it
is known in graph theory.
Given a directed graph G=(V,E,W) where W is the weights of the edges.
I would like to divide the graph into subgraphs G_i=(V_i, E_i,
Hi,
I have to write a program in c or cpp to check whether 2 given
graphs(given in adjacency matrix or list) are isomorphic..
Could any please help me?
I am not worried about the running time..So even the heuristic
approach will do..
Thanks
Mithun
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do dfs on graph and then do dfs on transpose of the graph(just reverse the
edges that is transpose) in order of decreasing order of finishing time of
vertices.
the number of vertices you need to apply dfs on second time will be number
of strongly connected components.
On Mon, Jul 19, 2010 at 6:44
how to find strongly connected components in a graph?
plz explain the method of DFS of G and DFS of complement of G and how second
DFS is related to first.
give any other idea if anyone has
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your 1st Q:
for each vertex run a dfs and count the number of vertices it can reach O(
V^2 + VE )
another solution would be using an algorithm similar to floyd-warshal O(V^3)
a[src][dest] is true if there is an edge src->dest
for (k=0;khttp://groups.google.com/group/algogeeks?hl=en.
@anand ..can you explain it more with example
On Mon, Jul 12, 2010 at 10:19 AM, Anand wrote:
> topological sort would cover every vertex once. The path given by
> Topological sort would be the answer. We can also calculate the vertices
> given by topological sort and compare it with given vertic
topological sort would cover every vertex once. The path given by
Topological sort would be the answer. We can also calculate the vertices
given by topological sort and compare it with given vertices. if it is same
then graph G does contain a directed path that touches every vertex exactly
once.
O
Give a linear-time algorithm for the following task.
Input: : A directed acyclic graph G (V,E)
Question: Does G contain a directed path that touches every vertex exactly
once?
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1.Give an efficient algorithm which takes as input a directed graph G =
(V,E), and determines whether or not there is a vertex s is in V from which
all other vertices are reachable.?
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yeah secod part will be in n^2*k
On Sun, Jul 11, 2010 at 9:36 AM, sharad kumar wrote:
> how to do second part
> it requires log k matrix multiplication
> thus o(n3 log n)
> plzz xplain
>
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how to do second part
it requires log k matrix multiplication
thus o(n3 log n)
plzz xplain
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an adjacency matrix
On Sun, Jul 11, 2010 at 8:45 AM, sharad wrote:
> A graph is given. You need to design a data structure with minimum
> space complexity such that it does the follows--> Finds whether nodes
> u and v have a path in between them in O(1) time.--> Finds whether
> there is a pa
A graph is given. You need to design a data structure with minimum
space complexity such that it does the follows--> Finds whether nodes
u and v have a path in between them in O(1) time.--> Finds whether
there is a path of length k between u and v in O(k) time.The same data
structure to be used for
How many vertices are required to obtain 1024 unique undirected graphs. Find
out the no. of vertices in a graph given the graph is:
a) Undirected cyclic
b) Directed Cyclic
c) Undirected non cyclic
d) Directed non cyclic.
The graph can be disconnected.
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a) Consider
green 1
red 1 | | green 2
| |
*imagine diagonals* with red 500 and red 2.
Could not explain better without diagram...
hope it's clear
b) Make a spanning tree of
Hi,
Please help me to solve following problems
Let *G *= (*V; E;w*) be a weighted undirected graph whose edges are colored
either
red or green. That is *E *= *Er [ Eg *and *Er \ Eg *= *;*, where *Er *are
the red edges
and *Eg *are the green edges. Assume that all edge weights are distinct (so
there is a graph, consisting of N Vertices and some Edges !
each Vertex has a Capacity(for storing Beads), and Capacity of 1st and
N-th Vertex is infinite !
there are M Beads in the first Vertex, and we want to move this M
Beads to the N-th Vertex with the minimum number of steps !
in each step, w
Hello
I came across the following problem which i am unable to solve :
Given a Graph G. we have to find the minimum number of vertices that
should be colored so that each vertex is
either colored or has a neighbouring vertex which is colored.
Please help
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Hello,
I need to create an software which analyzes these two algorithms.
Maybe anyone knows where I can find RLF and DSATUR algo pseudocode? or
full description.
I can't find nothing about DSATUR algo.
for RLF I try to implement this algo:
> procedure ColorByRLF();
> var
> clr
Given a DAG and two vertices s and t , give a linear time number of
paths between s and t in G.
How does topological sort help in finding the same ?
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I need experimentally compare RLF and DSATUR graph coloring heuristics
algorithms.
Maybe anyone have some information, or maybe some optimized peas of code ?
:)
Lukas.
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can anyone explain me how to find the diameter of a graph using
dyanamic programming ?
thanks in advance...
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can anyone please tell me how to find
single source longest path in a directed acyclic graph??
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i am attempting to solve http://acm.uva.es/p/v1/125.html
i am giving my code below :
the feedback is wrong answer..
i am unable to spot the error..
pls help me..
thanx in advance !
#include
#include
#define G 1
#define W 0
int func(int i,int j,int **graph,int **out,int *visited,int max);
void in
Here's a graph problem.
We are given a directed graph. We are allowed to change the directions
of the edges.
Our aim is to minimize the maximum degree in the graph.
How do we achieve this?
One way is to take the vertex with maximum degree, and take another
vertex with least degree reachable from
Hi,
I have been faced with this problem for weeks and could not find a
good solution. can someone help?
Given a graph whose nodes are bit vectors of length "n" (the graph
contains all 2^n nodes), the edges are defined to be connecting all
the pairs of nodes which differ only at one bit positi
hello all
I have assignment of my
I come up with the idea of 3 graphs which inter connected.
following is:
the robot is able to guide people around the cities, he will tell you
how to go from one place to the other places according to some
condition or constraint.
1- each place will assign
Hi everyone. I would like to know if there are any online tutorials
available for learning graph theory and its applications in the world
of theoretical computer science and algorithms. Can you also suggest
some books that I might find useful? Let me also add that i am not
really a CS major
--~-
I am working on an interesting graph optimization problem and I would
like to have a few expert opinions for helping me with a solution.
So here goes ...
I have a black box with a complex internal circuitry that is
represented in the form of a graph. I have to abstract the graph by
reducing the
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