3 files changed, 566 insertions, 0 deletions

diff --git a/day04 b/day04
new file mode 100644
index 0000000..61150ac
--- /dev/null
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@@ -0,0 +1,512 @@
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diff --git a/day04.cc b/day04.cc
new file mode 100644
index 0000000..85ae224
--- /dev/null
+++ b/day04.cc
@@ -0,0 +1,48 @@
+#include <algorithm>
+#include <iostream>
+#include <iterator>
+#include <numeric>
+#include <set>
+#include <sstream>
+#include <string>
+#include <unordered_set>
+#include <vector>
+
+using namespace std;
+
+namespace anagram {
+	struct is_anagram {
+		bool operator()(const string &a, const string &b) const {
+			return is_permutation(begin(a), end(a), begin(b));
+		}
+	};
+
+	struct unordered_hash {
+		size_t operator()(const string &a) const {
+			return accumulate(begin(a), end(a), 0);
+		}
+	};
+
+	using set = unordered_set<string,unordered_hash,is_anagram>;
+}
+
+int
+main()
+{
+	string line;
+	int p1 = 0, p2 = 0;
+
+	while (getline(cin, line)) {
+		istringstream is1{line}, is2{line};
+		set<string> words{istream_iterator<string>(is1),
+		    istream_iterator<string>()};
+		anagram::set awords{words.cbegin(), words.cend()};
+		size_t wcount = distance(istream_iterator<string>(is2),
+		    istream_iterator<std::string>());
+
+		if (words.size() == wcount) p1++;
+		if (awords.size() == wcount) p2++;
+	}
+
+	cout << p1 << endl << p2 << endl;
+}
diff --git a/day04.k b/day04.k
new file mode 100644
index 0000000..2708f53
--- /dev/null
+++ b/day04.k
@@ -0,0 +1,6 @@
++/1={|/+/w~/:\:w:" "\x}'0:`day04          / 383
++/1={|/+/x~/:\:x}'" "\'0:`day04           / 383
++/{~+/~':x@<x}'" "\'0:`day04              / 383 thanks inr
++/1={|/+/w~/:\:w:{x@<x}'" "\x}'0:`day04   / 265
++/{~+/~':x@<x:{x@<x}'x}'" "\'0:`day04     / 265 thanks inr
+\\