diff --git a/Makefile b/Makefile
index f41f124..0f09778 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 CXXFLAGS := -std=c++11 -Wall -Wextra -O2
 
-progs := $(patsubst %.cc,%,$(wildcard *.cc))
+progs := $(patsubst %.cc,%,$(wildcard d*.cc))
 
 .PHONY: all
 all: $(addsuffix _output.txt,$(progs))
diff --git a/d04.cc b/d04.cc
new file mode 100644
index 0000000..1fb3fa8
--- /dev/null
+++ b/d04.cc
@@ -0,0 +1,58 @@
+#include <iostream>
+#include <vector>
+#include <array>
+
+using namespace std;
+
+class Range {
+public:
+    unsigned min;
+    unsigned max;
+
+    bool contains(const Range &in) {
+        return min <= in.min && max >= in.max;
+    }
+
+    bool overlaps(const Range &in) {
+        return (min <= in.min && in.min <= max)
+            || (min <= in.max && in.max <= max)
+            || (in.min <= min && min <= in.max)
+            || (in.min <= max && max <= in.max);
+    }
+};
+
+typedef vector<array<Range, 2>> Input;
+
+Input parse()
+{
+    Input data;
+    for (string line; getline(cin, line);) {
+        array<Range, 2> entry;
+        sscanf(line.c_str(), "%u-%u,%u-%u",
+                &entry[0].min, &entry[0].max,
+                &entry[1].min, &entry[1].max);
+        data.push_back(entry);
+    }
+    return data;
+}
+
+unsigned p1(const Input &input)
+{
+    unsigned count = 0;
+    for (auto i : input) if (i[0].contains(i[1]) || i[1].contains(i[0])) count++;
+    return count;
+}
+
+unsigned p2(const Input &input)
+{
+    unsigned count = 0;
+    for (auto i : input) if (i[0].overlaps(i[1])) count++;
+    return count;
+}
+
+int main()
+{
+    Input input = parse();
+    cout << p1(input) << endl;
+    cout << p2(input) << endl;
+}
diff --git a/d04.py b/d04.py
new file mode 100644
index 0000000..94c0363
--- /dev/null
+++ b/d04.py
@@ -0,0 +1,12 @@
+#!/usr/bin/env python3
+
+from sys import stdin
+data = [(range(int(a1), int(a2)+1), range(int(b1), int(b2)+1))
+        for (a1, a2), (b1, b2) in [(a.split("-"), b.split("-"))
+            for a, b in [x.split(",") for x in stdin.readlines()]]]
+print(sum(all(x in b for x in a) or all(x in a for x in b) for a, b in data))
+print(sum(bool(set(a) & set(b)) for a, b in data))
+
+for a, b in data:
+    if set(a) & set(b):
+        print((a,b))
diff --git a/d04_input.txt b/d04_input.txt
new file mode 100644
index 0000000..aa044e4
--- /dev/null
+++ b/d04_input.txt
@@ -0,0 +1,1000 @@
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diff --git a/d04_output.txt b/d04_output.txt
new file mode 100644
index 0000000..0db9d6d
--- /dev/null
+++ b/d04_output.txt
@@ -0,0 +1,2 @@
+599
+928
diff --git a/template.cc b/template.cc
new file mode 100644
index 0000000..06f8930
--- /dev/null
+++ b/template.cc
@@ -0,0 +1,31 @@
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+typedef vector<unsigned> Input;
+
+Input parse()
+{
+    Input data;
+    return data;
+}
+
+unsigned p1(const Input &input)
+{
+    (void)input;
+    return 0;
+}
+
+unsigned p2(const Input &input)
+{
+    (void)input;
+    return 0;
+}
+
+int main()
+{
+    Input input = parse();
+    cout << p1(input) << endl;
+    cout << p2(input) << endl;
+}