Add 2017 day 9 puzzles

2017/puzzle-09-01.cc

@@ -0,0 +1,41 @@
+#include <iostream>
+#include <string>
+
+auto main() -> int
+{
+  std::string line;
+  if (!std::getline(std::cin, line)) {
+    std::cerr << "Unable to parse line\n";
+    return 1;
+  }
+
+  unsigned score{0};
+  unsigned depth{0};
+  bool skip{false};
+  bool in_garbage{false};
+
+  for (auto c : line) {
+    if (skip) {
+      skip = false;
+    }
+    else if (in_garbage && c == '!') {
+      skip = true;
+    }
+    else if (in_garbage && c == '>') {
+      in_garbage = false;
+    }
+    else if (!in_garbage && c == '{') {
+      ++depth;
+      score += depth;
+    }
+    else if (!in_garbage && c == '}') {
+      --depth;
+    }
+    else if (!in_garbage && c == '<') {
+      in_garbage = true;
+    }
+  }
+
+  std::cout << "Score = " << score << '\n';
+  return 0;
+}

2017/puzzle-09-02.cc

@@ -0,0 +1,46 @@
+#include <iostream>
+#include <string>
+
+auto main() -> int
+{
+  std::string line;
+  if (!std::getline(std::cin, line)) {
+    std::cerr << "Unable to parse line\n";
+    return 1;
+  }
+
+  unsigned score{0};
+  unsigned garbage_count{0};
+  unsigned depth{0};
+  bool skip{false};
+  bool in_garbage{false};
+
+  for (auto c : line) {
+    if (skip) {
+      skip = false;
+    }
+    else if (in_garbage && c == '!') {
+      skip = true;
+    }
+    else if (in_garbage && c == '>') {
+      in_garbage = false;
+    }
+    else if (!in_garbage && c == '{') {
+      ++depth;
+      score += depth;
+    }
+    else if (!in_garbage && c == '}') {
+      --depth;
+    }
+    else if (!in_garbage && c == '<') {
+      in_garbage = true;
+    }
+    else if (in_garbage) {
+      ++garbage_count;
+    }
+  }
+
+  std::cout << "Score = " << score << '\n';
+  std::cout << "Garbage count = " << garbage_count << '\n';
+  return 0;
+}