This one is from university assignment. I am completely stuck on this one and I searched the internet but couldn't find a explanation.
Show that the 3-color problem is in P when the input graph is a tree.
Any explanation would be appreciated.
2026-03-25 10:55:34.1774436134
Show that the 3-color problem is in P when the input graph is a tree.
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UPDATED following a suggestion in the comments.
Both (1) and (2) are doable in polynomial time (how?) so this is in $P$