From 020549d323273821665f638124606d43c0b6251a Mon Sep 17 00:00:00 2001
From: Matthew Gretton-Dann <matt@gretton-dann.org.uk>
Date: Mon, 13 Dec 2021 11:49:38 +0000
Subject: [PATCH] Add 2017 day 1 puzzles

---
 2017/puzzle-01-01.cc | 21 +++++++++++++++++++++
 2017/puzzle-01-02.cc | 23 +++++++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 2017/puzzle-01-01.cc
 create mode 100644 2017/puzzle-01-02.cc

diff --git a/2017/puzzle-01-01.cc b/2017/puzzle-01-01.cc
new file mode 100644
index 0000000..f80a640
--- /dev/null
+++ b/2017/puzzle-01-01.cc
@@ -0,0 +1,21 @@
+#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;
+  }
+
+  std::uint64_t v{0};
+  for (std::size_t idx{0}; idx < line.size() - 1; ++idx) {
+    if (line[idx] == line[idx + 1]) { v += line[idx] - '0';}
+  }
+  if (line[0] == line[line.size() - 1]) {
+    v += line[0] -'0';
+  }
+
+  std::cout << "CAPTCHA: " << v << '\n';
+}
diff --git a/2017/puzzle-01-02.cc b/2017/puzzle-01-02.cc
new file mode 100644
index 0000000..3f37d09
--- /dev/null
+++ b/2017/puzzle-01-02.cc
@@ -0,0 +1,23 @@
+#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;
+  }
+
+  std::string h1{line.substr(0, line.size() / 2)};
+  std::string h2{line.substr(line.size() / 2)};
+
+  std::uint64_t v{0};
+  for (std::size_t idx{0}; idx < h1.size(); ++idx) {
+    if (h1[idx] == h2[idx]) {
+      v += (line[idx] - '0') * 2;
+    }
+  }
+
+  std::cout << "CAPTCHA: " << v << '\n';
+}