diff --git a/Day 3/Marcus/cpp/part1.cpp b/Day 3/Marcus/cpp/part1.cpp
new file mode 100644
index 0000000..5f4313d
--- /dev/null
+++ b/Day 3/Marcus/cpp/part1.cpp	
@@ -0,0 +1,20 @@
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+    string in;
+    
+    int counts[12] = {0};
+	
+	int result = 0;
+    
+    while(cin >> in) for(int i = 0; i < 12; i++) counts[i] = (in[i]=='1')?(counts[i]+1):(counts[i]-1);
+    
+    for(int i = 0; i < 12; i++) result |= ((counts[i]>0)?1:0)<<(11-i);
+    
+    cout << result*(result^0x0FFF) << endl;
+
+    return 0;
+}
\ No newline at end of file
diff --git a/Day 3/Marcus/cpp/part2.cpp b/Day 3/Marcus/cpp/part2.cpp
new file mode 100644
index 0000000..8321a21
--- /dev/null
+++ b/Day 3/Marcus/cpp/part2.cpp	
@@ -0,0 +1,57 @@
+#include <iostream>
+#include <vector>
+#include <string>
+
+using namespace std;
+
+int main()
+{
+    vector<string> m_in, l_in;
+    string in_str;
+    
+    while(cin >> in_str) m_in.push_back(in_str);
+    
+    l_in = vector<string>(m_in);
+    
+    int m_c, l_c;
+    
+    for(int i = 0; i < m_in[0].size() && m_in.size() > 1; i++)
+    {
+        m_c = 0;
+        for(int j = 0; j < m_in.size(); j++)
+        {
+            m_c += (m_in[j][i] == '1')?1:-1;
+        }
+        
+        for(int j = 0; j < m_in.size() && m_in.size() > 1; j++)
+        {
+            if (((m_c>=0)?'0':'1')==m_in[j][i])
+            {
+                m_in.erase(m_in.begin()+j);
+                j--;
+            }
+        }
+    }
+    
+    for(int i = 0; i < l_in[0].size() && l_in.size() > 1; i++)
+    {
+        l_c = 0;
+        for(int j = 0; j < l_in.size(); j++)
+        {
+            l_c += (l_in[j][i] == '1')?1:-1;
+        }
+        
+        for(int j = 0; j < l_in.size() && l_in.size() > 1; j++)
+        {
+            if (((l_c>=0)?'1':'0')==l_in[j][i])
+            {
+                l_in.erase(l_in.begin()+j);
+                j--;
+            }
+        }
+    }
+    
+    cout << stoi(m_in[0],nullptr,2)*stoi(l_in[0],nullptr,2) << endl;
+
+    return 0;
+}