aoc 2017, days 1-20

1 files changed, 57 insertions, 0 deletions

diff --git a/2017/src/day05.cpp b/2017/src/day05.cpp
new file mode 100644
index 0000000..93656b6
--- /dev/null
+++ b/2017/src/day05.cpp
@@ -0,0 +1,57 @@
+#include <filesystem>
+#include <fstream>
+#include <iostream>
+
+using namespace std;
+
+namespace {
+
+vector<int>
+read_lines(const filesystem::path& filename)
+{
+        ifstream    file{ filename };
+        vector<int> lines;
+
+        for ( int value{}; file >> value; ) {
+                lines.emplace_back(value);
+        }
+
+        return lines;
+}
+
+void
+part1(vector<int> values)
+{
+        int steps = 0;
+        for ( size_t ip = 0; ip < values.size(); ) {
+                auto offset = values[ip]++;
+                ip += static_cast<size_t>(offset);
+                ++steps;
+        }
+
+        cout << "Part1: " << steps << '\n';
+}
+
+void
+part2(vector<int> values)
+{
+        int steps = 0;
+        for ( size_t ip = 0; ip < values.size(); ) {
+                auto offset = values[ip];
+                values[ip] += (offset >= 3) ? -1 : 1;
+                ip += static_cast<size_t>(offset);
+                ++steps;
+        }
+
+        cout << "Part2: " << steps << '\n';
+}
+
+} // namespace
+
+int
+main()
+{
+        auto values = read_lines("data/day05.txt");
+        part1(values);
+        part2(values);
+}