# HG changeset patch
# User Jordi Gutiérrez Hermoso <jordigh@octave.org>
# Date 1513471522 18000
# Node ID 70937ca0e7ebbce2cd65cd38f8a367cc3527f700
# Parent  1b739c38298064ee1c40a9fdafe71b4c997d770a
day 14: part 2

diff --git a/2017/day14.d b/2017/day14.d
--- a/2017/day14.d
+++ b/2017/day14.d
@@ -1,18 +1,51 @@
 import std.stdio;
-import std.bitmanip: BitArray;
-import std.array: array;
-import std.algorithm;
-import std.range: iota;
+import std.algorithm: map, sum;
+import std.range: join;
 import std.format: format;
 
 import day10: calcHash, getHash;
 
-auto countBits(string input) {
-  return iota(0,128).map!(
-   i => BitArray(format("%s-%d", input, i).calcHash, 128).bitsSet.array.length
-  ).sum;
+auto getBitMap(string input) {
+  int[][] bitmap;
+  foreach(i; 0..128) {
+    bitmap ~= format("%s-%d", input, i).calcHash[].map!(
+      function(ubyte x) {
+        int[] result;
+        for(auto i = 7; i >= 0; i--) {
+          result ~= (x & (1 << i)) ? 1 : 0;
+        }
+        return result;
+      }
+    ).join;
+  }
+  return bitmap;
+}
+
+void wipeRegion(ref int[][] bitmap, int i, int j) {
+  if (i < 0 || j < 0 || i > 127 || j > 127 || bitmap[i][j] == 0)
+    return;
+  bitmap[i][j] = 0;
+  bitmap.wipeRegion(i+1, j);
+  bitmap.wipeRegion(i-1, j);
+  bitmap.wipeRegion(i, j+1);
+  bitmap.wipeRegion(i, j-1);
+}
+
+auto countRegions(int[][] bitmap) {
+  auto numregions = 0;
+  foreach(i; 0..128) {
+    foreach(j; 0..128) {
+      if(bitmap[i][j]) {
+        numregions++;
+        bitmap.wipeRegion(i, j);
+      }
+    }
+  }
+  return numregions;
 }
 
 void main(string[] args) {
-  writeln(args[1].countBits);
+  auto bitmap = getBitMap(args[1]);
+  writeln(bitmap.map!(sum).sum);
+  writeln(bitmap.countRegions);
 }