longest-path | 易学教程

finding longest path in a graph

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问题 I am trying to solve a program, where in I have to find the max number of cities connected for a given list of routes. for eg: if the given route is [['1', '2'], ['2', '4'], ['1', '11'], ['4', '11']] then max cities connected will be 4 constraint is I can't visit a city which I already have visited. I need ideas, as in how to progress. For now, What I have thought is if I could be able to create a dictionary with cities as a key and how many other cities its connected to as its value, i get

finding longest path in a graph

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Algorithm for Finding Longest Stretch of a Value at any Angle in a 2D Matrix

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问题 I am currently working on a computer-vision program that requires me to determine the "direction" of a color blob in an image. The color blob generally follows an elliptical shape and thus can be used to track direction (with respect to an initially defined/determined orientation) through time. The means by which I figured I would calculate changes in direction are described as follows: Quantize possible directions (360 degrees) into N directions (potentially 8, for 45 degree angle increments

Maximum number of elements in the path of a matrix

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问题 I tried to solve a problem of map (matrix 4x4) using python. I want to find Maximum number of elements in the path of a map provided the next node must be lesser than the previous node with all possible combinations of elements in the matrix. 4 8 7 3 2 5 9 3 6 3 2 5 4 4 1 6 The movement is like from an element can move to east-west-north-south For example from m[0][1] can move to m[0][2] and m[1][1] 4-> 8 or 2 Here is the sample code but i have no idea to how to recursively check every

NetworkX: Find longest path in DAG returning all ties for max

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问题 I'm having trouble figuring out how to update the networkx dag_find_longest_path() algorithm to return "N" for ties instead of returning the first max edge found, or returning a list of all edges that are tied for max weight. I first created a DAG from pandas dataframe that contains an edgelist like the following subset: edge1 edge2 weight 115252161:T 115252162:A 1.0 115252162:A 115252163:G 1.0 115252163:G 115252164:C 3.0 115252164:C 115252165:A 5.5 115252165:A 115252166:C 5.5 115252162:T

Longest chain of elements from list in Python

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问题 I have a list of nations, and I want to have the longest path of nations where each country chosen must begin with the same letter that ended the previous element nations = ['albania','andorra','austria','belarus','belgium','bosnia and herzegovina', 'bulgaria','croatia','czech republic','denmark','estonia', 'finland','france','germany','greece','hungary', 'iceland','ireland','italy','latvia','liechtenstein','lithuania','luxembourg', 'macedonia','malta','moldova','monaco','montenegro',

Maximum number of elements in the path of a matrix

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I tried to solve a problem of map (matrix 4x4) using python. I want to find Maximum number of elements in the path of a map provided the next node must be lesser than the previous node with all possible combinations of elements in the matrix. 4 8 7 3 2 5 9 3 6 3 2 5 4 4 1 6 The movement is like from an element can move to east-west-north-south For example from m[0][1] can move to m[0][2] and m[1][1] 4-> 8 or 2 Here is the sample code but i have no idea to how to recursively check every element. #import itertools n = 4 matrix = [[4, 8, 7, 3 ], [2, 5, 9, 3 ], [6, 3, 2, 5 ], [4, 4, 1, 6]] for

Longest chain of elements from list in Python

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I have a list of nations, and I want to have the longest path of nations where each country chosen must begin with the same letter that ended the previous element nations = ['albania','andorra','austria','belarus','belgium','bosnia and herzegovina', 'bulgaria','croatia','czech republic','denmark','estonia', 'finland','france','germany','greece','hungary', 'iceland','ireland','italy','latvia','liechtenstein','lithuania','luxembourg', 'macedonia','malta','moldova','monaco','montenegro','netherlands', 'norway','poland','portugal','romania','russia', 'san marino','serbia','slovakia','slovenia',

Longest path in graph

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问题 Since last 2 days,i'm trying to find some logic for calculating longest path in graph.I know i can find it easily for DAGs and in general it is polynomial time algorithm.Formally,I want to implement heuristic for computing longest path,morever,if probability p is given with which an edge is present in graph,how can we solve the problem..help... 回答1: Calculating longest path cannot be done in polynomial time as far as I know. Following java implementation of the longest path algorithm finds

Longest path in graph

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Since last 2 days,i'm trying to find some logic for calculating longest path in graph.I know i can find it easily for DAGs and in general it is polynomial time algorithm.Formally,I want to implement heuristic for computing longest path,morever,if probability p is given with which an edge is present in graph,how can we solve the problem..help... Calculating longest path cannot be done in polynomial time as far as I know. Following java implementation of the longest path algorithm finds the longest path of a positive weighted graph for a given source but it takes exponential time in its worst