1 files changed, 56 insertions, 0 deletions

diff --git a/2015/src/day05.cpp b/2015/src/day05.cpp
new file mode 100644
index 0000000..b88ecf5
--- /dev/null
+++ b/2015/src/day05.cpp
@@ -0,0 +1,56 @@
+#include <algorithm>
+#include <fstream>
+#include <iostream>
+#include <regex>
+#include <string>
+#include <vector>
+
+using namespace std;
+
+auto
+read_file(string_view filename)
+{
+        fstream        input{ filename };
+        vector<string> lines;
+
+        for ( string line; getline(input, line); ) {
+                lines.emplace_back(line);
+        }
+
+        return lines;
+}
+
+void
+part1(const vector<string>& lines)
+{
+        const regex re1("(.*[aeiou]){3}");
+        const regex re2("(.)\\1");
+        const regex re3("(ab|cd|pq|xy)");
+
+        auto count = count_if(begin(lines), end(lines), [&](auto line) {
+                return regex_search(line, re1) && regex_search(line, re2) && !regex_search(line, re3);
+        });
+
+        cout << count << endl;
+}
+
+void
+part2(const vector<string>& lines)
+{
+        const regex re1("(..).*\\1");
+        const regex re2("(.).\\1");
+
+        auto count = count_if(begin(lines), end(lines), [&](auto line) {
+                return regex_search(line, re1) && regex_search(line, re2);
+        });
+
+        cout << count << endl;
+}
+
+int
+main()
+{
+        auto puzzle = read_file("data/day05.txt");
+        part1(puzzle);
+        part2(puzzle);
+}