YAPC::EU 2018 Glasgow Update!

Task/Pythagorean-triples/Scala/pythagorean-triples.scala

@@ -0,0 +1,25 @@
+object PythagoreanTriples extends App {
+
+  println("               Limit Primatives          All")
+
+  for {e <- 2 to 7
+       limit = math.pow(10, e).longValue()
+  } {
+    var primCount, tripCount = 0
+
+    def parChild(a: BigInt, b: BigInt, c: BigInt): Unit = {
+      val perim = a + b + c
+      val (a2, b2, c2, c3) = (2 * a, 2 * b, 2 * c, 3 * c)
+      if (limit >= perim) {
+        primCount += 1
+        tripCount += (limit / perim).toInt
+        parChild(a - b2 + c2, a2 - b + c2, a2 - b2 + c3)
+        parChild(a + b2 + c2, a2 + b + c2, a2 + b2 + c3)
+        parChild(-a + b2 + c2, -a2 + b + c2, -a2 + b2 + c3)
+      }
+    }
+
+    parChild(BigInt(3), BigInt(4), BigInt(5))
+    println(f"a + b + c <= ${limit.toFloat}%3.1e  $primCount%9d $tripCount%12d")
+  }
+}