From 71f6069359d071b41a32cbfa3d8c26481cd694e9 Mon Sep 17 00:00:00 2001
From: Johannes Loher <johannes.loher@fg4f.de>
Date: Tue, 8 Dec 2020 09:13:05 +0100
Subject: [PATCH] day6: solve part 1 & 2

---
 day6/part1/input  | 2179 +++++++++++++++++++++++++++++++++++++++++++++
 day6/part1/main.d |   37 +
 day6/part2/input  | 2179 +++++++++++++++++++++++++++++++++++++++++++++
 day6/part2/main.d |   51 ++
 4 files changed, 4446 insertions(+)
 create mode 100644 day6/part1/input
 create mode 100644 day6/part1/main.d
 create mode 100644 day6/part2/input
 create mode 100644 day6/part2/main.d

diff --git a/day6/part1/input b/day6/part1/input
new file mode 100644
index 0000000..e04309e
--- /dev/null
+++ b/day6/part1/input
@@ -0,0 +1,2179 @@
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diff --git a/day6/part1/main.d b/day6/part1/main.d
new file mode 100644
index 0000000..4fd9533
--- /dev/null
+++ b/day6/part1/main.d
@@ -0,0 +1,37 @@
+import std.algorithm;
+import std.uni;
+import std.array;
+import std.file;
+import std.stdio;
+
+void main()
+{
+    readText("input").calculateTotalNumberOfQuestions.writeln;
+}
+
+auto calculateTotalNumberOfQuestions(string input)
+{
+    return input.splitter("\n\n")
+        .array.map!(group => group.filter!isAlpha.array.sort.uniq.count).sum;
+}
+
+unittest
+{
+    auto input = `abc
+
+a
+b
+c
+
+ab
+ac
+
+a
+a
+a
+a
+
+b`;
+
+    assert(input.calculateTotalNumberOfQuestions == 11);
+}
diff --git a/day6/part2/input b/day6/part2/input
new file mode 100644
index 0000000..e04309e
--- /dev/null
+++ b/day6/part2/input
@@ -0,0 +1,2179 @@
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+wfhvabg
+
+c
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+c
+
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+
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diff --git a/day6/part2/main.d b/day6/part2/main.d
new file mode 100644
index 0000000..5a1309a
--- /dev/null
+++ b/day6/part2/main.d
@@ -0,0 +1,51 @@
+import std.algorithm;
+import std.uni;
+import std.array;
+import std.file;
+import std.stdio;
+import std.range;
+import std.conv;
+import std.string;
+
+void main()
+{
+    readText("input").calculateTotalNumberOfQuestions.writeln;
+}
+
+auto setIntersectionRoR(RoR)(RoR ror)
+{
+    assert(!ror.empty);
+    return ror.map!(to!(dchar[]))
+        .reduce!((r1, r2) => r1.setIntersection(r2).array);
+}
+
+auto calculateTotalNumberOfQuestions(string input)
+{
+    return input.splitter("\n\n").array.map!((group) {
+        return group.splitter.map!(person => person.representation.dup.sort.array.assumeUTF)
+            .setIntersectionRoR.count;
+    }).sum;
+}
+
+unittest
+{
+    auto input = `abc
+
+a
+b
+c
+
+ab
+ac
+
+a
+a
+a
+a
+
+b
+
+yx`;
+
+    assert(input.calculateTotalNumberOfQuestions == 8);
+}