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Task/Maximum-triangle-path-sum/Scala/maximum-triangle-path-sum.scala

@@ -0,0 +1,21 @@
+object MaximumTrianglePathSum extends App {
+    // Solution:
+    def sum(triangle: Array[Array[Int]]) =
+        triangle.reduceRight((upper, lower) =>
+            upper zip (lower zip lower.tail)
+            map {case (above, (left, right)) => above + Math.max(left, right)}
+        ).head
+
+    // Tests:
+    def triangle = """
+                          55
+                        94 48
+                       95 30 96
+                     77 71 26 67
+    """
+    def parse(s: String) = s.trim.split("\\s+").map(_.toInt)
+    def parseLines(s: String) = s.trim.split("\n").map(parse)
+    def parseFile(f: String) = scala.io.Source.fromFile(f).getLines.map(parse).toArray
+    println(sum(parseLines(triangle)))
+    println(sum(parseFile("triangle.txt")))
+}