diff --git a/.gitignore b/.gitignore
index 1bd6c37..d8df003 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
.vs/
.exe/
.o/
+*.o
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
deleted file mode 100644
index c47ed2d..0000000
--- a/2018/3rdDay/challenge1/obj/Debug/netcoreapp2.1/.NETCoreApp,Version=v2.1.AssemblyAttributes.cs
+++ /dev/null
@@ -1,4 +0,0 @@
-//
-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
deleted file mode 100644
index 2127774..0000000
--- a/2018/3rdDay/challenge1/obj/Debug/netcoreapp2.1/challenge1.AssemblyInfo.cs
+++ /dev/null
@@ -1,23 +0,0 @@
-//------------------------------------------------------------------------------
-//
-// 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.
-//
-//------------------------------------------------------------------------------
-
-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
deleted file mode 100644
index 5a40878..0000000
--- a/2018/3rdDay/challenge1/obj/Debug/netcoreapp2.1/challenge1.AssemblyInfoInputs.cache
+++ /dev/null
@@ -1 +0,0 @@
-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
deleted file mode 100644
index c47ed2d..0000000
--- a/2018/3rdDay/challenge2/obj/Debug/netcoreapp2.1/.NETCoreApp,Version=v2.1.AssemblyAttributes.cs
+++ /dev/null
@@ -1,4 +0,0 @@
-//
-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
deleted file mode 100644
index 4c0f79b..0000000
--- a/2018/3rdDay/challenge2/obj/Debug/netcoreapp2.1/challenge2.AssemblyInfo.cs
+++ /dev/null
@@ -1,23 +0,0 @@
-//------------------------------------------------------------------------------
-//
-// 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.
-//
-//------------------------------------------------------------------------------
-
-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
deleted file mode 100644
index 09e273d..0000000
--- a/2018/3rdDay/challenge2/obj/Debug/netcoreapp2.1/challenge2.AssemblyInfoInputs.cache
+++ /dev/null
@@ -1 +0,0 @@
-d23734efb6c85f77056301d19eda620d53b5abad
diff --git a/2020/1.cpp b/2020/1.cpp
index a27e1a2..6c8337d 100644
--- a/2020/1.cpp
+++ b/2020/1.cpp
@@ -5,7 +5,7 @@
int main()
{
- std::ifstream file ("./1i.txt");
+ std::ifstream file ("./1.txt");
std::vector input;
std::string line;
diff --git a/2020/2.cpp b/2020/2.cpp
new file mode 100644
index 0000000..1caa8cb
--- /dev/null
+++ b/2020/2.cpp
@@ -0,0 +1,79 @@
+#include
+#include
+#include
+#include
+
+std::vector split(const std::string& str, const std::string& delim)
+{
+ std::vector tokens;
+ size_t prev = 0, pos = 0;
+ do
+ {
+ pos = str.find(delim, prev);
+ if (pos == std::string::npos) pos = str.length();
+ std::string token = str.substr(prev, pos-prev);
+ if (!token.empty()) tokens.push_back(token);
+ prev = pos + delim.length();
+ }
+ while (pos < str.length() && prev < str.length());
+ return tokens;
+}
+
+std::vector readFile(std::string path)
+{
+ std::ifstream file(path);
+ std::vector input;
+ std::string line;
+
+ while(std::getline(file, line))
+ {
+ input.push_back(line);
+ }
+ return input;
+}
+
+
+int main()
+{
+ std::vector input = readFile("./2.txt");
+
+ int total = 0;
+ for (auto& line : input)
+ {
+ std::vector parts = split(line, " ");
+
+ int lower, upper;
+ std::vector bounds = split(parts[0], "-");
+ lower = std::stoi(bounds[0]);
+ upper = std::stoi(bounds[1]);
+
+ char searchterm = parts[1][0];
+
+ int count = 0;
+ for (int i = 0; i < parts[2].length(); i++)
+ if (parts[2][i] == searchterm) count++;
+
+ if (count >= lower && count <= upper) total++;
+ }
+
+ std::cout << "Part 1, valid passwords: " << total << std::endl;
+
+ total = 0;
+ for (auto& line : input)
+ {
+ std::vector parts = split(line, " ");
+
+ int first, second;
+ std::vector bounds = split(parts[0], "-");
+ first = std::stoi(bounds[0]) - 1;
+ second = std::stoi(bounds[1]) - 1;
+
+ char searchterm = parts[1][0];
+
+ // A terrible logical XOR
+ if (!(parts[2][first] == searchterm) != !(parts[2][second] == searchterm)) total++;
+ }
+
+ std::cout << "Part 2, valid passwords: " << total << std::endl;
+
+}
diff --git a/2020/2.txt b/2020/2.txt
new file mode 100644
index 0000000..e02f28b
--- /dev/null
+++ b/2020/2.txt
@@ -0,0 +1,1000 @@
+5-9 g: ggccggmgn
+11-16 l: llllqllllllllflq
+3-6 q: qvqqqpzqd
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+8-9 j: ljjjnjgjjvjdjfjl
+6-7 q: qqqvqkqqn
+5-6 w: twldlwww
+10-13 k: kkkkfkkkkglkv
+11-19 c: vzgccvbksxwcvhxglkw
+3-5 h: hhjhwp
+4-5 x: zxkcx
+2-3 m: rmjrvlsm
+2-4 v: vvvvvv
+1-5 g: ggggbg
+4-5 q: qqqlkqqq
+4-5 j: tjznjjm
+1-12 g: ggggggggggggg
+1-10 s: dssssssssssss
+6-7 r: rfrrrrmrr
+3-6 s: hljhqs
+2-11 j: jfjjljsjdcr
+7-8 m: smzmmmmm
+6-8 h: mhhmsxhqthcfb
+2-9 w: jwlbwngdw
+4-7 v: vvvlvvzvv
+5-9 z: bgzbzpfvjqvkbqstg
+6-10 v: pvslvlvlvv
+6-13 x: tbmsxxxjdwnfr
+11-13 r: rrzrpwprrrrrrd
+14-15 k: pdbnmhrfppnxfkkvfxvk
+10-12 t: tttttttttttgtttt
+6-8 g: ltbggnrgr
+9-12 d: dpdddddddddd
+10-11 q: sqrqqqqqqqq
+4-14 j: jjjjjjjjjjjjjjjjjj
+15-16 c: cccccccccccccctc
+4-9 z: gzzzzzhzzbzzzdv
+2-13 x: glxmkxxxxxxxxxx
+3-12 n: ccnvfnxxkpdxnpdppcn
+4-7 w: wnrwlzwrlbrrwvs
+13-16 t: tttttmttttttwtttt
+5-6 l: cllhqlzlblv
+13-15 s: mtfbvkkjznwsssl
+2-13 k: lksdvschkvfchrwkf
+3-6 j: fdjnjbf
+7-8 l: llrzbldc
+2-4 l: ljnrv
+1-5 h: qhhpt
+2-4 k: rhwkqk
+17-20 d: cqdxmvnqtdddddznnddl
+1-4 z: zzzzz
+3-10 v: vvgvvvvvvtvvvvh
+4-9 q: fwqnjqqjkjq
+9-17 r: rrrrrrrrrjrrrcwrtf
+4-5 k: kkkzkkkk
+9-14 m: mmhmmfhhmmmsmm
+6-9 h: hshhhhhhh
+3-4 n: ngnnn
+8-17 b: zbvbpgqbsrzwmxzdbfw
+4-8 k: wktkzcbg
+8-9 w: wwddwcrwwpkbswswwkx
+5-13 d: dndddpfdzfdvpzdhddd
+11-16 p: fplppmnxvzpqsngpp
+1-12 h: hhbhhhhhqghhhhhhxhh
+11-12 z: zzzzzzzzzzhz
+3-5 h: bhdhkl
+3-4 h: hcvl
+3-4 d: zbddddcrpgdxddt
+17-18 j: qzwfjjkfpkggsjqvjwx
+9-13 j: wfjtjjjgjjmtjjwjlh
+2-5 f: xdpsfkpzvfmhf
+4-5 c: cccccc
+13-14 h: hhhjhhhhhhhmshhh
+9-14 t: tttttttttttttntth
+5-6 s: ssssdks
+1-8 t: tgbtdkht
+4-8 h: mhbhpvhh
+17-18 x: xxxnxqjgxclqkxxxxx
+2-5 g: jmvmgnghr
+13-16 n: nnnnnnhqnnnnnvnnn
+3-7 v: ngqvtvfbdlr
+8-14 c: cnmrshvhlqnchtcbrgh
+7-9 n: tfqswnnrg
+11-16 x: kgxgvcftmxgxbnxg
+2-4 n: zqnd
+1-3 w: wwwncwwwkwfww
+8-9 z: zzzbzzzzzzzzzzzzz
+17-20 k: kkkkkkkkkkkkkkkkkkkk
+3-5 q: hjqrqsq
+12-13 h: hhhhhhhhfhhhh
+3-4 x: gxxjphxx
+4-6 g: sbwggg
\ No newline at end of file
diff --git a/2020/adventofcode.hpp b/2020/adventofcode.hpp
new file mode 100644
index 0000000..a151778
--- /dev/null
+++ b/2020/adventofcode.hpp
@@ -0,0 +1,76 @@
+#ifndef AOC_H_
+#define AOC_H_
+
+int day1part1();
+int day1part2();
+
+int day2part1();
+int day2part2();
+
+int day3part1();
+int day3part2();
+
+int day4part1();
+int day4part2();
+
+int day5part1();
+int day5part2();
+
+int day6part1();
+int day6part2();
+
+int day7part1();
+int day7part2();
+
+int day8part1();
+int day8part2();
+
+int day9part1();
+int day9part2();
+
+int day10part1();
+int day10part2();
+
+int day11part1();
+int day11part2();
+
+int day12part1();
+int day12part2();
+
+int day13part1();
+int day13part2();
+
+int day14part1();
+int day14part2();
+
+int day15part1();
+int day15part2();
+
+int day16part1();
+int day16part2();
+
+int day17part1();
+int day17part2();
+
+int day18part1();
+int day18part2();
+
+int day19part1();
+int day19part2();
+
+int day20part1();
+int day20part2();
+
+int day21part1();
+int day21part2();
+
+int day22part1();
+int day22part2();
+
+int day23part1();
+int day23part2();
+
+int day24part1();
+int day24part2();
+
+#endif
diff --git a/2020/helpers.cpp b/2020/helpers.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/2020/main.cpp b/2020/main.cpp
new file mode 100644
index 0000000..e69de29