From 204f9fc02aaa0424448865ae047cdbbb056ea78b Mon Sep 17 00:00:00 2001
From: Matthew Gretton-Dann <matt@gretton-dann.org.uk>
Date: Mon, 13 Dec 2021 16:17:05 +0000
Subject: [PATCH] Add 2017 day 5 puzzles

---
 2017/puzzle-05-01.cc | 26 ++++++++++++++++++++++++++
 2017/puzzle-05-02.cc | 31 +++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 2017/puzzle-05-01.cc
 create mode 100644 2017/puzzle-05-02.cc

diff --git a/2017/puzzle-05-01.cc b/2017/puzzle-05-01.cc
new file mode 100644
index 0000000..223713d
--- /dev/null
+++ b/2017/puzzle-05-01.cc
@@ -0,0 +1,26 @@
+#include <iostream>
+#include <string>
+#include <vector>
+
+using Int = long;
+
+auto main() -> int
+{
+  std::vector<Int> jumps;
+  std::string line;
+  while (std::getline(std::cin, line) && !line.empty()) {
+    jumps.push_back(std::stol(line));
+  }
+
+  Int pc{0};
+  unsigned steps{0};
+  while (pc >= 0 && pc < jumps.size()) {
+    ++steps;
+    auto delta = jumps[pc];
+    ++(jumps[pc]);
+    pc += delta;
+  }
+
+  std::cout << "Steps: " << steps << '\n';
+  return 0;
+}
diff --git a/2017/puzzle-05-02.cc b/2017/puzzle-05-02.cc
new file mode 100644
index 0000000..16c9b5f
--- /dev/null
+++ b/2017/puzzle-05-02.cc
@@ -0,0 +1,31 @@
+#include <iostream>
+#include <string>
+#include <vector>
+
+using Int = long;
+
+auto main() -> int
+{
+  std::vector<Int> jumps;
+  std::string line;
+  while (std::getline(std::cin, line) && !line.empty()) {
+    jumps.push_back(std::stol(line));
+  }
+
+  Int pc{0};
+  unsigned steps{0};
+  while (pc >= 0 && pc < jumps.size()) {
+    ++steps;
+    auto delta = jumps[pc];
+    if (delta >= 3) {
+      --(jumps[pc]);
+    }
+    else {
+      ++(jumps[pc]);
+    }
+    pc += delta;
+  }
+
+  std::cout << "Steps: " << steps << '\n';
+  return 0;
+}