Construct a connected graph containing n vertices for which the 3-Coloring Backtracking algorithm will take exponential time to discover that the graph is not 3-colorable.
Is there many solutions to this problem? give me a idea.
The time complexity of optimal algorithm for 3-Coloring Backtracking algorithm is O(1.3289n).
So, the algorithm will take exponential time to discover that the graph is not 3-colorable for any connected graph possible.
Hence, yes there are multiple solutions to this question.
One of the graphs can be a complete graph with 8 vertices, it is drawn below :

Construct a connected graph containing n vertices for which the 3-Coloring Backtracking algorithm will take exponential...
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Turing Award for having just shown that P = NP? Why or why not?
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Recall the definition of the degree of a vertex in a graph. a)
Suppose a graph has 7 vertices, each of degree 2 or 3. Is the graph
necessarily connected ?
b) Now the graph has 7 vertices, each degree 3 or 4. Is it
necessarily connected?
My professor gave an example in class. He said triangle and a
square are graph which are not connected yet each vertex has degree
2.
(Paul Zeitz, The Art and Craft of Problem...
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