Question: The graph coloring problem is the following: COLORING: Data: adjacency matrix M of an m-vertex undirected graph. Decide: if there exists a vector v

The graph coloring problem is the following:

COLORING:

Data: adjacency matrix M of an m-vertex undirected graph.

Decide: if there exists a vector v € {bleu, rouge, vert}msuch that for every edge (a, b) in the graph, v[a] v[b].

a- Sketch a backtracking algorithm colo(M) for Coloring. Hint. Think of what might be a k-promising vector, 0 Sk Sm.

b- Even if no deterministic polynomial time algorithm solving Coloring is known, could you turn your algorithm above into a polynomial time Las Vegas algorithm? (Explain.)

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