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/jneira-4clojure-solution91.clj

Created May 28, 2011 22:56
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jneira-4clojure-solution91.clj
;; jneira's solution to Graph Connectivity
;; https://4clojure.com/problem/91
(fn ? [c]
(let [[x & s] (map set c)
p (group-by #(if (some x %) 1 0) s)
y (set (apply concat x (p 1)))]
(or (nil? (p 0))
(and (not= x y)
(? (cons y (p 0)))))))
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