Add solution for 2016 Day 7

res/2016/day07/test_input.txt

@@ -0,0 +1,8 @@
+abba[mnop]qrst
+abcd[bddb]xyyx
+aaaa[qwer]tyui
+ioxxoj[asdfgh]zxcvbn
+aba[bab]xyz
+xyx[xyx]xyx
+aaa[kek]eke
+zazbz[bzb]cdb

src/2016/Day07.cpp

@@ -2,30 +2,165 @@
 
 namespace y2016::day07
 {
-  REGISTER_DAY(2016, Day07, std::vector<int>, int);
+  struct IP
+  {
+    std::vector<std::string> s;
+    std::vector<std::string> hypernets;
 
-  REGISTER_TEST_EXAMPLE(2016, Day07, ExampleInput, 1, 0);
-  REGISTER_TEST(2016, Day07, Input, 1, 0);
-  REGISTER_TEST_EXAMPLE(2016, Day07, ExampleInput, 2, 0);
-  REGISTER_TEST(2016, Day07, Input, 2, 0);
+    friend std::ostream& operator<<(std::ostream& os, const IP& ip)
+    {
+      for (int i = 0; i < ip.s.size() + ip.hypernets.size(); i++)
+      {
+        if (i % 2 == 0)
+          os << ip.s[i / 2] << " ";
+        else
+          os << "[" << ip.hypernets[i / 2] << "] ";
+      }
+      return os;
+    }
+  };
+
+  REGISTER_DAY(2016, Day07, std::vector<IP>, int);
+
+  REGISTER_TEST_EXAMPLE(2016, Day07, ExampleInput, 1, 2);
+  REGISTER_TEST(2016, Day07, Input, 1, 115);
+  REGISTER_TEST_EXAMPLE(2016, Day07, ExampleInput, 2, 3);
+  REGISTER_TEST(2016, Day07, Input, 2, 231);
 
   READ_INPUT(input)
   {
-    std::vector<int> vec;
+    std::vector<IP> vec;
     std::string str;
     while (getline(input, str))
     {
+      IP ip;
+      bool readHypernet = false;
+      char c = '[';
+      size_t prevPos = 0;
+      size_t pos = str.find(c);
+      while (pos != std::string::npos)
+      {
+        if (!readHypernet)
+        {
+          c = ']';
+          ip.s.emplace_back(str.substr(prevPos, pos - prevPos));
+        }
+        else
+        {
+          c = '[';
+          ip.hypernets.emplace_back(str.substr(prevPos, pos - prevPos));
+        }
+        prevPos = pos + 1;
+        pos = str.find(c, prevPos);
+        readHypernet = !readHypernet;
+      }
+      ip.s.emplace_back(str.substr(prevPos));
+      vec.emplace_back(ip);
     }
     return vec;
   }
 
+  bool HasABBA(const std::string& str)
+  {
+    for (size_t i = 0; i < str.size() - 3; i++)
+    {
+      if (str[i] == str[i + 3] && str[i + 1] == str[i + 2] && str[i] != str[i + 1])
+        return true;
+    }
+
+    return false;
+  }
+
+  bool SupportsTLS(const IP& ip)
+  {
+    for (const auto& hypernet : ip.hypernets)
+    {
+      if (HasABBA(hypernet))
+      {
+        return false;
+      }
+    }
+
+    for (const auto& s : ip.s)
+    {
+      if (HasABBA(s))
+      {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  std::vector<std::pair<char, char>> GetABAs(const std::string& str)
+  {
+    std::vector<std::pair<char, char>> result;
+    for (size_t i = 0; i < str.size() - 2; i++)
+    {
+      if (str[i] == str[i + 2] && str[i] != str[i + 1])
+        result.emplace_back(str[i], str[i + 1]);
+    }
+    return result;
+  }
+
+  bool HasABA(const std::string& str, char c1, char c2)
+  {
+    for (size_t i = 0; i < str.size() - 2; i++)
+    {
+      if (str[i] == c1 && str[i + 1] == c2 && str[i + 2] == c1)
+        return true;
+    }
+    return false;
+  }
+
+  bool HasABA(const std::vector<std::string>& hypernets, char c1, char c2)
+  {
+    for (const auto& hypernet : hypernets)
+    {
+      if (HasABA(hypernet, c1, c2))
+        return true;
+    }
+    return false;
+  }
+
+  bool SupportsSSL(const IP& ip)
+  {
+    for (const auto& s : ip.s)
+    {
+      std::vector<std::pair<char, char>> abas = GetABAs(s);
+      for (const auto& aba : abas)
+      {
+        if (HasABA(ip.hypernets, aba.second, aba.first))
+        {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
   OUTPUT1(input)
   {
-    return 0;
+    int count = 0;
+    for (const auto& ip : input)
+    {
+      if (SupportsTLS(ip))
+      {
+        count++;
+      }
+    }
+    return count;
   }
 
   OUTPUT2(input)
   {
-    return 0;
+    int count = 0;
+    for (const auto& ip : input)
+    {
+      if (SupportsSSL(ip))
+      {
+        count++;
+      }
+    }
+    return count;
   }
 }