From cd2acfd143f9fae9c62b11446df1a16d25c4d5ac Mon Sep 17 00:00:00 2001
From: Bert Peters <bert@bertptrs.nl>
Date: Mon, 4 Dec 2017 10:20:06 +0100
Subject: [PATCH] Implement day 4 part 2.

---
 2017/README.md                              |  5 ++--
 2017/day-04/{solution.awk => solution1.awk} |  0
 2017/day-04/solution2.awk                   | 33 +++++++++++++++++++++
 3 files changed, 36 insertions(+), 2 deletions(-)
 rename 2017/day-04/{solution.awk => solution1.awk} (100%)
 create mode 100644 2017/day-04/solution2.awk

diff --git a/2017/README.md b/2017/README.md
index e113253..4288cfd 100644
--- a/2017/README.md
+++ b/2017/README.md
@@ -6,11 +6,12 @@ and using 25 different programming languages.
 
 The current plan, in no particular order:
 
-- [ ] AWK (note, not included in shell script)
+- [x] AWK - [Day 04](./day-04) (two separate scripts)
 - [x] Bash/shell script - [Day 02](./day-02/solution.sh)
 - [ ] C
 - [x] C++ - [Day 01](./day-01/solution.cpp)
 - [ ] C#
+- [ ] Clojure - [Day 03](./day-03/solution.clj) (need to finish part 2)
 - [ ] Coffeescript
 - [ ] Haskell
 - [ ] Java
@@ -27,4 +28,4 @@ The current plan, in no particular order:
 - [ ] Scheme
 - [ ] SQL
 
-… and then I will need 5 more. But that will come in time.
+… and then I will need some more. But that will come in time.
diff --git a/2017/day-04/solution.awk b/2017/day-04/solution1.awk
similarity index 100%
rename from 2017/day-04/solution.awk
rename to 2017/day-04/solution1.awk
diff --git a/2017/day-04/solution2.awk b/2017/day-04/solution2.awk
new file mode 100644
index 0000000..aad962a
--- /dev/null
+++ b/2017/day-04/solution2.awk
@@ -0,0 +1,33 @@
+function word2key(word, a, i, n, result)
+{
+    n = split(word, a, "")
+    asort(a)
+
+    for (i = 1; i <= n; i++)
+        result = result a[i]
+
+    return result
+}
+
+BEGIN {
+	valid=0
+}
+{
+	duplicates=0
+	for (i=1;i<=NF;i++) {
+		a[word2key($i)]++
+	}
+	for (x in a)
+	{
+		if(a[x]>1)
+			duplicates++
+	}
+	for (x in a)
+		delete a[x]
+
+	if(duplicates==0)
+		valid++
+}
+END {
+	print valid
+}