Clojure
(defn equal-sides [candidate-array] (loop [c candidate-array idx 1 lt 0 rt 0] (cond (empty? c) -1 (and (= lt rt) (= 1 (count c))) idx :else (let [inc-l (> (+ rt (last c)) (+ lt (first c)))] (recur (if inc-l (rest c) (butlast c)) (if inc-l (inc idx) idx) (+ lt (if inc-l (first c) 0)) (+ rt (if-not inc-l (last c) 0)))))))
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Clojure