# HG changeset patch
# User Jordi Gutiérrez Hermoso <jordigh@octave.org>
# Date 1513047548 18000
# Node ID 66707d1400b460b2f4bcf047528bbcd039f90285
# Parent  bd993cf00e2f011c84379fe09a0b7921643c3b9e
day 11

diff --git a/2017/day11.d b/2017/day11.d
new file mode 100644
--- /dev/null
+++ b/2017/day11.d
@@ -0,0 +1,37 @@
+import std.array: array;
+import std.math: abs;
+import std.string: chomp, split;
+import std.algorithm: min, map, cumulativeFold, maxElement;
+import std.stdio;
+
+immutable int[2][string] directions;
+
+pure static this(){
+  directions = [
+    "ne": [1,1],
+    "n": [0,1],
+    "nw": [-1,0],
+    "sw": [-1,-1],
+    "s": [0,-1],
+    "se": [1,0],
+  ];
+}
+
+auto hexNorm(int x, int y) {
+  if (x*y < 0) {
+    return abs(x) + abs(y);
+  }
+  x = abs(x);
+  y = abs(y);
+  return abs(x - y) + min(x, y);
+}
+
+void main(string[] args) {
+  auto norms =
+    File(args[1]).readln.chomp.split(",").map!(x => directions[x])
+    .cumulativeFold!((a, b) => [a[0] + b[0], a[1] + b[1]])([0, 0])
+    .map!(xy => hexNorm(xy[0], xy[1]))
+    .array;
+  writeln(norms[$-1]);
+  writeln(norms.maxElement);
+}