aoc

diff --git a/resources/input09.txt b/resources/input09.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3102d884ecfd78e795cfe802218b37de5885672e
--- /dev/null
+++ b/resources/input09.txt
@@ -0,0 +1,1000 @@
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diff --git a/src/aoc/day09.clj b/src/aoc/day09.clj
new file mode 100644
index 0000000000000000000000000000000000000000..ee3f16be045660e1b7da38f1c6ccc2e57a8ec4e0
--- /dev/null
+++ b/src/aoc/day09.clj
@@ -0,0 +1,82 @@
+(ns aoc.day09
+  (:require [clojure.java.io :as io]))
+
+(def example
+  "35
+20
+15
+25
+47
+40
+62
+55
+65
+95
+102
+117
+150
+182
+127
+219
+299
+277
+309
+576")
+
+(defn valid? [n coll]
+  (seq (for [x coll
+          y coll
+          :when (not= x y)
+          :when (= n (+ x y))]
+      [x y])))
+
+(defn read-input []
+  (->> (io/resource "input09.txt")
+       io/reader
+       line-seq
+       (map read-string)))
+
+(defn read-example-input []
+  (->> example
+       clojure.string/split-lines
+       (map read-string)))
+
+(defn compute-1 [input size]
+  (loop [step 0]
+    (let [without-old (drop step input)
+          pool (take size without-old)
+          candidate (nth without-old size)]
+      (if-not (valid? candidate pool)
+        candidate
+        (recur (inc step))))))
+
+(defn adds-up? [coll n]
+  (loop [nums []
+         index 0]
+    (cond
+      (= (apply + nums) n) nums
+      (> (apply + nums) n) nil
+      :else (recur (conj nums (nth coll index))
+                   (inc index)))))
+
+(defn find-range [input n]
+  (loop [coll input]
+    (let [r (adds-up? coll n)]
+      (if-not (nil? r)
+        r
+        (recur (rest coll))))))
+
+(defn compute-2 [input n]
+  (let [result (find-range input n)]
+    (+ (apply min result)
+       (apply max result))))
+
+
+(defn main []
+  (let [input (read-input)
+        size 25
+        n (compute-1 input size)]
+    (println n)
+    (println (compute-2 input n))))
+
+(main)