1 files changed, 78 insertions, 0 deletions

diff --git a/2017/src/day04.cpp b/2017/src/day04.cpp
new file mode 100644
index 0000000..01e89b2
--- /dev/null
+++ b/2017/src/day04.cpp
@@ -0,0 +1,78 @@
+#include <algorithm>
+#include <filesystem>
+#include <fstream>
+#include <iostream>
+#include <set>
+#include <sstream>
+#include <string>
+
+using namespace std;
+
+namespace {
+
+vector<string>
+read_lines(const filesystem::path& filename)
+{
+        ifstream       file{ filename };
+        vector<string> lines;
+
+        for ( string line; getline(file, line); ) {
+                lines.emplace_back(line);
+        }
+
+        return lines;
+}
+
+vector<string>
+split(const string& line)
+{
+        stringstream   strm{ line };
+        vector<string> words;
+
+        for ( string word; strm >> word; ) {
+                words.emplace_back(word);
+        }
+
+        return words;
+}
+
+void
+part1(const vector<string>& lines)
+{
+        auto num = ranges::count_if(lines, [](const string& line) {
+                auto        words = split(line);
+                set<string> set{ words.begin(), words.end() };
+
+                return set.size() == words.size();
+        });
+
+        cout << "Part1: " << num << '\n';
+}
+
+void
+part2(const vector<string>& lines)
+{
+        auto num = ranges::count_if(lines, [](const string& line) {
+                auto        words = split(line);
+                set<string> set;
+
+                for ( auto word: words ) {
+                        ranges::sort(word);
+                        set.insert(word);
+                }
+
+                return set.size() == words.size();
+        });
+
+        cout << "Part2: " << num << '\n';
+}
+
+} // namespace
+
+int
+main()
+{
+        auto lines = read_lines("data/day04.txt");
+        part1(lines);
+        part2(lines);
+}