diff --git a/.vscode/settings.json b/.vscode/settings.json
index d002ed5..070c565 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -40,6 +40,18 @@
         "xstring": "cpp",
         "xtr1common": "cpp",
         "xutility": "cpp",
-        "algorithm": "cpp"
+        "algorithm": "cpp",
+        "concepts": "cpp",
+        "ctime": "cpp",
+        "iomanip": "cpp",
+        "iterator": "cpp",
+        "list": "cpp",
+        "map": "cpp",
+        "set": "cpp",
+        "unordered_map": "cpp",
+        "xhash": "cpp",
+        "xlocmon": "cpp",
+        "xloctime": "cpp",
+        "xtree": "cpp"
     }
 }
\ No newline at end of file
diff --git a/2018/3rdDay/challenge1/obj/Debug/netcoreapp2.1/.NETCoreApp,Version=v2.1.AssemblyAttributes.cs b/2018/3rdDay/challenge1/obj/Debug/netcoreapp2.1/.NETCoreApp,Version=v2.1.AssemblyAttributes.cs
new file mode 100644
index 0000000..c47ed2d
--- /dev/null
+++ b/2018/3rdDay/challenge1/obj/Debug/netcoreapp2.1/.NETCoreApp,Version=v2.1.AssemblyAttributes.cs
@@ -0,0 +1,4 @@
+// <autogenerated />
+using System;
+using System.Reflection;
+[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETCoreApp,Version=v2.1", FrameworkDisplayName = "")]
diff --git a/2018/3rdDay/challenge1/obj/Debug/netcoreapp2.1/challenge1.AssemblyInfo.cs b/2018/3rdDay/challenge1/obj/Debug/netcoreapp2.1/challenge1.AssemblyInfo.cs
new file mode 100644
index 0000000..2127774
--- /dev/null
+++ b/2018/3rdDay/challenge1/obj/Debug/netcoreapp2.1/challenge1.AssemblyInfo.cs
@@ -0,0 +1,23 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: System.Reflection.AssemblyCompanyAttribute("challenge1")]
+[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
+[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0")]
+[assembly: System.Reflection.AssemblyProductAttribute("challenge1")]
+[assembly: System.Reflection.AssemblyTitleAttribute("challenge1")]
+[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
+
+// Generated by the MSBuild WriteCodeFragment class.
+
diff --git a/2018/3rdDay/challenge1/obj/Debug/netcoreapp2.1/challenge1.AssemblyInfoInputs.cache b/2018/3rdDay/challenge1/obj/Debug/netcoreapp2.1/challenge1.AssemblyInfoInputs.cache
new file mode 100644
index 0000000..5a40878
--- /dev/null
+++ b/2018/3rdDay/challenge1/obj/Debug/netcoreapp2.1/challenge1.AssemblyInfoInputs.cache
@@ -0,0 +1 @@
+4e41332ddf7d58c9b78f731c8689aa24d4aa5c68
diff --git a/2018/3rdDay/challenge2/obj/Debug/netcoreapp2.1/.NETCoreApp,Version=v2.1.AssemblyAttributes.cs b/2018/3rdDay/challenge2/obj/Debug/netcoreapp2.1/.NETCoreApp,Version=v2.1.AssemblyAttributes.cs
new file mode 100644
index 0000000..c47ed2d
--- /dev/null
+++ b/2018/3rdDay/challenge2/obj/Debug/netcoreapp2.1/.NETCoreApp,Version=v2.1.AssemblyAttributes.cs
@@ -0,0 +1,4 @@
+// <autogenerated />
+using System;
+using System.Reflection;
+[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETCoreApp,Version=v2.1", FrameworkDisplayName = "")]
diff --git a/2018/3rdDay/challenge2/obj/Debug/netcoreapp2.1/challenge2.AssemblyInfo.cs b/2018/3rdDay/challenge2/obj/Debug/netcoreapp2.1/challenge2.AssemblyInfo.cs
new file mode 100644
index 0000000..4c0f79b
--- /dev/null
+++ b/2018/3rdDay/challenge2/obj/Debug/netcoreapp2.1/challenge2.AssemblyInfo.cs
@@ -0,0 +1,23 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: System.Reflection.AssemblyCompanyAttribute("challenge2")]
+[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
+[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0")]
+[assembly: System.Reflection.AssemblyProductAttribute("challenge2")]
+[assembly: System.Reflection.AssemblyTitleAttribute("challenge2")]
+[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
+
+// Generated by the MSBuild WriteCodeFragment class.
+
diff --git a/2018/3rdDay/challenge2/obj/Debug/netcoreapp2.1/challenge2.AssemblyInfoInputs.cache b/2018/3rdDay/challenge2/obj/Debug/netcoreapp2.1/challenge2.AssemblyInfoInputs.cache
new file mode 100644
index 0000000..09e273d
--- /dev/null
+++ b/2018/3rdDay/challenge2/obj/Debug/netcoreapp2.1/challenge2.AssemblyInfoInputs.cache
@@ -0,0 +1 @@
+d23734efb6c85f77056301d19eda620d53b5abad
diff --git a/2020/1.cpp b/2020/1.cpp
new file mode 100644
index 0000000..a27e1a2
--- /dev/null
+++ b/2020/1.cpp
@@ -0,0 +1,57 @@
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <vector>
+
+int main()
+{
+    std::ifstream file ("./1i.txt");
+    std::vector<int> input;
+    std::string line;
+    
+    while(std::getline(file, line))
+    {
+        input.push_back(std::stoi(line));
+    }
+
+    int found = 0;
+
+    for (auto& i : input)
+    {
+        for (auto j : input)
+        {
+            if (i + j == 2020)
+            {
+                found = i * j;
+                break;
+            }
+        }
+        if (found != 0)
+            break;
+    }
+
+    std::cout << "Part 1, 2 entries that sum to 2020: " << found << std::endl;
+    found = 0;
+
+    for (auto& i : input)
+    {
+        for (auto j : input)
+        {
+            for (auto k : input)
+            {
+                if (i + j + k == 2020)
+                {
+                    found = i * j * k;
+                    break;
+                }
+            }
+            if (found != 0)
+                break;
+        }
+        if (found != 0)
+            break;
+    }
+    
+    std::cout << "Part 2, 3 entries that sum to 2020: " << found << std::endl;
+
+}
diff --git a/2020/1.txt b/2020/1.txt
new file mode 100644
index 0000000..3e96826
--- /dev/null
+++ b/2020/1.txt
@@ -0,0 +1,200 @@
+1036
+1897
+1256
+1080
+1909
+1817
+1759
+1883
+1088
+1841
+1780
+1907
+1874
+1831
+1932
+1999
+1989
+1840
+1973
+1102
+1906
+1277
+1089
+1275
+1228
+1917
+1075
+1060
+1964
+1942
+2001
+1950
+1181
+1121
+1854
+1083
+1772
+1481
+1976
+1805
+1594
+1889
+1726
+1866
+798
+1739
+1709
+1946
+1948
+1808
+1836
+1849
+1465
+1066
+1943
+664
+1894
+1993
+1061
+1225
+1589
+1916
+1885
+1998
+1470
+1668
+1666
+1499
+1437
+1986
+1127
+1875
+1132
+1888
+1877
+1046
+1982
+1265
+1757
+1848
+1786
+1638
+1958
+1015
+1013
+1552
+1742
+1850
+1016
+1839
+558
+1826
+1261
+1988
+1545
+1078
+1963
+1967
+1951
+1086
+1947
+1880
+1903
+1994
+1167
+1736
+1041
+1652
+1040
+1033
+1179
+1844
+1861
+1488
+1962
+1135
+1347
+1187
+1777
+1598
+1803
+1147
+1760
+1926
+1898
+1923
+1865
+1313
+1924
+1023
+1576
+1715
+1391
+1346
+1882
+2000
+1024
+1143
+1065
+1560
+1029
+1119
+1966
+1022
+1931
+1512
+1049
+1929
+1312
+1069
+1159
+1053
+1249
+1074
+1983
+1761
+1868
+195
+24
+1331
+1636
+1020
+1034
+1671
+708
+1699
+1900
+1927
+1829
+301
+1832
+1042
+1896
+1928
+1032
+1992
+2005
+1955
+1047
+1068
+1001
+1052
+1744
+1845
+1208
+1018
+1859
+1342
+1823
+1758
+2007
+1241
+1893
+1876
+1984
+1655
+1534
+1150
+1789
+1870
\ No newline at end of file