Task 2

9 files changed, 81 insertions, 8 deletions

diff --git a/challenge-079/tyler-wardhaugh/clojure/README.md b/challenge-079/tyler-wardhaugh/clojure/README.md
index b576ec7183..37d274beb5 100644
--- a/challenge-079/tyler-wardhaugh/clojure/README.md
+++ b/challenge-079/tyler-wardhaugh/clojure/README.md
@@ -21,6 +21,17 @@ Run Task #2 with input:
 
     $ clojure -m tw.weekly.c79.t2 A1 A2 A3 [...]
 
+See SVG files in the `resources` directory for the histograms drawn for each of the tests for Task 2:
+
+![2 1 4 1 2 5](resources/t2.test1.svg "[2 1 4 1 2 5]")
+
+![3 1 3 1 1 5](resources/t2.test2.svg "[3 1 3 1 1 5]")
+
+![1 2 3 4 5 4 3 2 1](resources/t2.test3.svg "[1 2 3 4 5 4 3 2 1]")
+
+![4 1 3 1 2 5 10 5 7](resources/t2.test4.svg "[4 1 3 1 2 5 10 5 7]")
+
+
 ## Project Template
 
 I used Sean Corfield's clj-new to generate the project template
diff --git a/challenge-079/tyler-wardhaugh/clojure/deps.edn b/challenge-079/tyler-wardhaugh/clojure/deps.edn
index 236f47e5b1..988d683304 100644
--- a/challenge-079/tyler-wardhaugh/clojure/deps.edn
+++ b/challenge-079/tyler-wardhaugh/clojure/deps.edn
@@ -1,5 +1,6 @@
 {:paths ["src" "resources"]
- :deps {org.clojure/clojure {:mvn/version "1.10.1"}}
+ :deps {org.clojure/clojure {:mvn/version "1.10.1"}
+        metasoarous/oz {:mvn/version "1.6.0-alpha26"}}
  :aliases
  {:test {:extra-paths ["test"]
          :extra-deps {org.clojure/test.check {:mvn/version "1.0.0"}}}
diff --git a/challenge-079/tyler-wardhaugh/clojure/pom.xml b/challenge-079/tyler-wardhaugh/clojure/pom.xml
index 9644c7aec7..a5ef0fbd29 100644
--- a/challenge-079/tyler-wardhaugh/clojure/pom.xml
+++ b/challenge-079/tyler-wardhaugh/clojure/pom.xml
@@ -30,6 +30,11 @@
       <artifactId>clojure</artifactId>
       <version>1.10.1</version>
     </dependency>
+    <dependency>
+      <groupId>metasoarous</groupId>
+      <artifactId>oz</artifactId>
+      <version>1.6.0-alpha26</version>
+    </dependency>
   </dependencies>
   <build>
     <sourceDirectory>src</sourceDirectory>
diff --git a/challenge-079/tyler-wardhaugh/clojure/resources/t2.test1.svg b/challenge-079/tyler-wardhaugh/clojure/resources/t2.test1.svg
new file mode 100644
index 0000000000..c3f51d8d13
--- /dev/null
+++ b/challenge-079/tyler-wardhaugh/clojure/resources/t2.test1.svg
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/challenge-079/tyler-wardhaugh/clojure/resources/t2.test2.svg b/challenge-079/tyler-wardhaugh/clojure/resources/t2.test2.svg
new file mode 100644
index 0000000000..1d37ffddb2
--- /dev/null
+++ b/challenge-079/tyler-wardhaugh/clojure/resources/t2.test2.svg
@@ -0,0 +1 @@
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diff --git a/challenge-079/tyler-wardhaugh/clojure/resources/t2.test3.svg b/challenge-079/tyler-wardhaugh/clojure/resources/t2.test3.svg
new file mode 100644
index 0000000000..0eab4070e1
--- /dev/null
+++ b/challenge-079/tyler-wardhaugh/clojure/resources/t2.test3.svg
@@ -0,0 +1 @@
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diff --git a/challenge-079/tyler-wardhaugh/clojure/resources/t2.test4.svg b/challenge-079/tyler-wardhaugh/clojure/resources/t2.test4.svg
new file mode 100644
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diff --git a/challenge-079/tyler-wardhaugh/clojure/src/tw/weekly/c79/t2.clj b/challenge-079/tyler-wardhaugh/clojure/src/tw/weekly/c79/t2.clj
index dc08a1106c..45513901c1 100644
--- a/challenge-079/tyler-wardhaugh/clojure/src/tw/weekly/c79/t2.clj
+++ b/challenge-079/tyler-wardhaugh/clojure/src/tw/weekly/c79/t2.clj
@@ -1,10 +1,59 @@
 (ns tw.weekly.c79.t2
-  (:require [clojure.pprint :refer [cl-format]])
-  (:require [clojure.edn :as edn]))
+  (:require [clojure.edn :as edn])
+  (:require [oz.core :as oz]))
 
-;;; Task description for TASK #2 ›
+;;; Task description for TASK #2 › Trapped Rain Water
+; You are given an array of positive numbers @N.
+;
+; Write a script to represent it as Histogram Chart and find out how much water it can trap.
+;
+; Example 1:
+; Input: @N = (2, 1, 4, 1, 2, 5)
+; The histogram representation of the given array is as below.
+;      5           #
+;      4     #     #
+;      3     #     #
+;      2 #   #   # #
+;      1 # # # # # #
+;      _ _ _ _ _ _ _
+;        2 1 4 1 2 5
 ;;;
 
+(defn splits
+  "Partition the input by splitting it at each index, ensuring partitions contain at least one element."
+  [coll]
+  (map #(split-at % coll) (range 1 (dec (count coll)))))
+
+(defn calculate-pools
+  "Returns a sequence of pools, which are the amount of water 'units' that can be held at the inner elements of the coll, when viewed as a histogram."
+  [coll]
+  (let [neighboring-maxes (fn [[l [c & r]]] [(apply max l) c (apply max r)])
+        to-water (fn [[l c r]] (max (- (min l r) c) 0))]
+    (->> (splits coll)
+         (eduction (map neighboring-maxes) (map to-water)))))
+
+(defn capacity
+  "Calculates the total capacity of the pools"
+  [pools]
+  (reduce + 0 pools))
+
+(defn draw-histogram
+  "Vizualize the histogram, using Oz (which uses Vega-Lite & Vega)"
+  ([coll] (draw-histogram coll (calculate-pools coll)))
+  ([coll pools] (let [make-hashes (fn [x land water] (list (hash-map :x x :y land :c "green") (hash-map :x x :y water :c "blue")))
+                      values (mapcat make-hashes (range) coll (concat [0] pools [0]))]
+                  (oz/view! {:data {:values values}
+                             :encoding {:x {:field :x :type "ordinal"}
+                                        :y {:field :y :type "quantitative" :aggregate "sum"}
+                                        :color {:field :c
+                                                :type "nominal"
+                                                :scale nil}}
+                             :mark "bar"}))))
+
 (defn -main
   [& args]
-  )
+  (let [N (or (some->> args (map edn/read-string)) [2 1 4 1 2 5])
+        pools (calculate-pools N)]
+    (println (capacity pools))
+    (oz/start-server!)
+    (draw-histogram N pools)))
diff --git a/challenge-079/tyler-wardhaugh/clojure/test/tw/weekly/c79_test.clj b/challenge-079/tyler-wardhaugh/clojure/test/tw/weekly/c79_test.clj
index 30f26ba18c..2b0efafdfc 100644
--- a/challenge-079/tyler-wardhaugh/clojure/test/tw/weekly/c79_test.clj
+++ b/challenge-079/tyler-wardhaugh/clojure/test/tw/weekly/c79_test.clj
@@ -1,7 +1,7 @@
 (ns tw.weekly.c79-test
   (:require [clojure.test :refer [deftest is testing]]
-            [tw.weekly.c79.t2 :refer []]))
             [tw.weekly.c79.t1 :refer [run]]
+            [tw.weekly.c79.t2 :refer [calculate-pools capacity]]))
 
 (deftest task-1
   (testing "Task 1, Count Set Bits"
@@ -9,5 +9,8 @@
     (is (= (run 3) 4)))))
 
 (deftest task-2
-  (testing ""
-    ))
+  (testing "Task 2, Trapped Rain Water"
+    (is (= (capacity (calculate-pools [2 1 4 1 2 5])) 6))
+    (is (= (capacity (calculate-pools [3 1 3 1 1 5])) 6))
+    (is (= (capacity (calculate-pools [1 2 3 4 5 4 3 2 1])) 0))
+    (is (= (capacity (calculate-pools [4 1 3 1 2 5 10 5 7])) 11))))