diff --git a/Day7/Day7A.cpp b/Day7/Day7A.cpp
new file mode 100644
index 0000000..577fa65
--- /dev/null
+++ b/Day7/Day7A.cpp
@@ -0,0 +1,67 @@
+#include <iostream>
+#include <vector>
+#include <fstream>
+#include <unordered_map>
+#include <set>
+
+#include <tuple>
+
+typedef std::unordered_multimap<char, char> graph_type;
+
+std::tuple<graph_type, std::set<char>> build_graph()
+{
+    graph_type graph;
+    std::ifstream file("Day7.in");
+    std::string line;
+
+    std::set<char> nodes;
+
+    while (std::getline(file, line)) {
+        char a = line[5];
+        char b = line[36];
+        std::cout << "a: " << a << ", b:" << b << std::endl;
+
+        graph.insert({ b, a });
+
+        nodes.insert(a);
+        nodes.insert(b);
+    }
+
+    return std::make_tuple(graph, nodes);
+}
+
+bool node_blocked(graph_type &graph, std::set<char> &to_consider, char node)
+{
+    auto [start, end] = graph.equal_range(node);
+    for (auto pair = start; pair != end; ++pair) {
+        char parent = pair->second;
+        if (to_consider.count(parent) > 0) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+int main(int argc, char **argv)
+{
+    auto [graph, to_consider] = build_graph();
+
+    std::vector<char> order;
+    while (!to_consider.empty()) {
+        for (auto node = to_consider.begin(); node != to_consider.end(); ++node) {
+            bool blocked = node_blocked(graph, to_consider, *node);
+            if (blocked)
+                continue;
+
+            order.push_back(*node);
+            std::cout << *node;
+
+            to_consider.erase(node);
+            break;
+        }
+    }
+    std::cout << std::endl;
+
+    return 0;
+}
diff --git a/Day8/Day8A.cpp b/Day8/Day8A.cpp
new file mode 100644
index 0000000..f03e994
--- /dev/null
+++ b/Day8/Day8A.cpp
@@ -0,0 +1,39 @@
+#include <iostream>
+#include <vector>
+
+std::vector<int> read_input()
+{
+    std::vector<int> input;
+    input.reserve(20000);
+
+    int i = 0;
+    while (std::cin >> i) {
+        input.push_back(i);
+    }
+
+    return input;
+}
+
+int read_node(std::vector<int>::iterator &it)
+{
+    int child_count = *it++;
+    int meta_count = *it++;
+
+    int value = 0;
+    for (int i = 0; i < child_count; i++) {
+        value += read_node(it);
+    }
+
+    for (int i = 0; i < meta_count; i++) {
+        value += *it++;
+    }
+
+    return value;
+}
+
+int main(int argc, char **argv)
+{
+    std::vector<int> input = read_input();
+    auto iterator = input.begin();
+    std::cout << read_node(iterator) << std::endl;
+}
diff --git a/Day8/Day8A.py b/Day8/Day8A.py
new file mode 100644
index 0000000..a4fad1f
--- /dev/null
+++ b/Day8/Day8A.py
@@ -0,0 +1,10 @@
+def read_node(it):
+    child_count, meta_count = next(it), next(it)
+
+    child_sum = sum(read_node(it) for _ in range(child_count))
+    own_sum = sum(next(it) for _ in range(meta_count))
+    return child_sum + own_sum
+
+
+it = (int(x) for x in input().split())
+print(read_node(it))
diff --git a/Day8/Day8B.cpp b/Day8/Day8B.cpp
new file mode 100644
index 0000000..b87caf1
--- /dev/null
+++ b/Day8/Day8B.cpp
@@ -0,0 +1,48 @@
+#include <iostream>
+#include <vector>
+
+std::vector<int> read_input()
+{
+    std::vector<int> input;
+    input.reserve(20000);
+
+    int i = 0;
+    while (std::cin >> i)
+        input.push_back(i);
+
+    return input;
+}
+
+int read_node(std::vector<int>::iterator &it)
+{
+    int child_count = *it++;
+    int meta_count = *it++;
+    int value = 0;
+
+    if (child_count == 0) {
+        for (int i = 0; i < meta_count; i++)
+            value += *it++;
+
+        return value;
+    }
+
+    std::vector<int> children;
+    for (int i = 0; i < child_count; i++) {
+        children.push_back(read_node(it));
+    }
+
+    for (int i = 0; i < meta_count; i++) {
+        int index = *it++;
+        if (index > 0 && index <= children.size())
+            value += children[index - 1];
+    }
+
+    return value;
+}
+
+int main(int argc, char **argv)
+{
+    std::vector<int> input = read_input();
+    auto iterator = input.begin();
+    std::cout << read_node(iterator) << std::endl;
+}
diff --git a/Day8/Day8B.py b/Day8/Day8B.py
new file mode 100644
index 0000000..46e133b
--- /dev/null
+++ b/Day8/Day8B.py
@@ -0,0 +1,18 @@
+def read_node(it):
+    child_count, meta_count = next(it), next(it)
+    if child_count == 0:
+        return sum(next(it) for _ in range(meta_count))
+
+    children = [read_node(it) for _ in range(child_count)]
+
+    value = 0
+    for _ in range(meta_count):
+        index = next(it)
+        if index > 0 and index <= len(children):
+            value += children[index - 1]
+
+    return value
+
+
+it = (int(x) for x in input().split())
+print(read_node(it))