diff --git a/2020/1/a.out b/2020/1/a.out
new file mode 100755
index 0000000..b0afe22
Binary files /dev/null and b/2020/1/a.out differ
diff --git a/2020/1/data b/2020/1/data
new file mode 100644
index 0000000..be449a5
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+++ b/2020/1/data
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diff --git a/2020/1/main.cpp b/2020/1/main.cpp
new file mode 100644
index 0000000..985c9c8
--- /dev/null
+++ b/2020/1/main.cpp
@@ -0,0 +1,43 @@
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <vector>
+
+int find2(std::vector<int> &numbers)
+{
+	for(auto i = 0; i < numbers.size(); ++i)
+		for(auto j = i + 1; j < numbers.size(); ++j)
+			if(numbers[i] + numbers[j] == 2020)
+				return numbers[i] * numbers[j];
+
+	return 0;
+}
+int find3(std::vector<int> &numbers)
+{
+	for(auto i = 0; i < numbers.size(); ++i)
+		for(auto j = i + 1; j < numbers.size(); ++j)
+			for(auto k = i + 1; k < numbers.size(); ++k)
+				if(numbers[i] + numbers[j] + numbers[k] == 2020)
+					return numbers[i] * numbers[j] * numbers[k];
+
+	return 0;
+}
+
+int main()
+{
+	std::ifstream ifs("data");
+	if(!ifs.is_open())
+	{
+		std::cerr << "Couldn't open file." << std::endl;
+		return -1;
+	}
+
+	std::vector<int> numbers;
+	for(std::string line; std::getline(ifs, line); )
+		numbers.push_back(std::atoi(line.c_str()));
+
+	std::cout << find2(numbers) << std::endl;
+	std::cout << find3(numbers) << std::endl;
+
+	return 0;
+}
diff --git a/2020/2/Makefile b/2020/2/Makefile
new file mode 100644
index 0000000..2f26a1b
--- /dev/null
+++ b/2020/2/Makefile
@@ -0,0 +1,2 @@
+a.out: main.cpp
+	clang++ -std=c++14 main.cpp -g -O0
diff --git a/2020/2/a.out b/2020/2/a.out
new file mode 100755
index 0000000..d9b5c20
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diff --git a/2020/2/data b/2020/2/data
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+8-9 t: tttttttttt
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+6-8 x: gxxdzbxzxxxx
+2-3 r: rmtkgcrvlrg
+6-7 r: cmrrwrzv
+2-3 c: dcjlzl
+6-13 b: bbbbbbrpbmbmnbbb
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+2-8 l: sllwlvjl
+3-5 b: bbxlbbb
+1-3 c: cczpq
+10-14 k: vqgnlzbbkjkljk
+3-7 h: hhfhhhhhhhhhhhh
+5-6 k: kfkkrx
+6-7 q: qqqqqqr
+5-8 l: dsqllgzl
+8-9 r: rrrrrrrrxr
+3-4 v: mvvh
+1-4 p: ppppppp
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+4-15 d: bfkxfrsznfkdzpjmbp
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\ No newline at end of file
diff --git a/2020/2/main.cpp b/2020/2/main.cpp
new file mode 100644
index 0000000..a112f70
--- /dev/null
+++ b/2020/2/main.cpp
@@ -0,0 +1,72 @@
+#include <algorithm>
+#include <fstream>
+#include <iostream>
+#include <string>
+
+// 6-7 w: wwhmzwtwwk
+bool Valid1(const std::string &str)
+{
+	int min, max;
+	char letter;
+	std::string password;
+
+	auto dash = str.find('-');
+	auto space = str.find(' ');
+	auto space_two = str.find(' ', space + 1);
+
+	min = std::atoi(str.substr(0, dash).c_str());
+	max = std::atoi(str.substr(dash + 1, space).c_str());
+	letter = str.at(space + 1);
+	password = str.substr(space_two + 1);
+
+	// std::cout << "min:    " << min << std::endl
+	//           << "max:    " << max << std::endl
+	//           << "letter: " << letter << std::endl
+	//           << "pass:   " << password << std::endl;
+
+	int total = std::count(password.begin(), password.end(), letter);
+
+	return (total >= min && total <= max);
+}
+
+bool Valid2(const std::string &str)
+{
+	int min, max;
+	char letter;
+	std::string password;
+
+	auto dash = str.find('-');
+	auto space = str.find(' ');
+	auto space_two = str.find(' ', space + 1);
+
+	min = std::atoi(str.substr(0, dash).c_str());
+	max = std::atoi(str.substr(dash + 1, space).c_str());
+	letter = str.at(space + 1);
+	password = str.substr(space_two + 1);
+
+	bool a = password[min - 1] == letter;
+	bool b = password[max - 1] == letter;
+
+	return a != b;
+}
+
+int main()
+{
+	std::ifstream ifs("data");
+	if(!ifs.is_open())
+		return -1;
+
+	int valid1 = 0;
+	int valid2 = 0;
+	for(std::string line; std::getline(ifs, line); )
+	{
+		if(Valid1(line))
+			++valid1;
+		if(Valid2(line))
+			++valid2;
+	}
+
+	std::cout << valid1 << " valid1 passwords." << std::endl;
+	std::cout << valid2 << " valid2 passwords." << std::endl;
+	return 0;
+}
diff --git a/2021/4/data b/2021/4/data
new file mode 100644
index 0000000..ba441b7
--- /dev/null
+++ b/2021/4/data
@@ -0,0 +1,601 @@
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diff --git a/2021/4/main.py b/2021/4/main.py
new file mode 100644
index 0000000..eb5937c
--- /dev/null
+++ b/2021/4/main.py
@@ -0,0 +1,75 @@
+# all the numbers called, in order
+numbers = []
+
+temp_board = []
+boards = []
+fills = []
+
+board_index = 0
+
+####
+def Victory(board):
+    for y in range(0, len(board)):
+        if(board[y] == [True, True, True, True, True]):
+            return True;
+
+    # NOTE(dev): Assumes all columns are the same length
+    for x in range(0, len(board[0])):
+        num_true = 0
+        for y in range(0, len(board)):
+            if(board[y][x]):
+                num_true = num_true + 1
+        if(num_true == len(board[0])):
+            return True
+
+    return False
+
+####
+def FindWinner(numbers):
+    for i in range(0, len(numbers)):
+        for board_index in range(0, len(boards)):
+            for y in range(0, len(boards[board_index])):
+                for x in range(0, len(boards[board_index][y])):
+                    if(boards[board_index][y][x] == numbers[i]):
+                        fills[board_index][y][x] = True
+                        if(Victory(fills[board_index])):
+                            print('Victory with', numbers[i], 'on board', board_index, '!!')
+                            return numbers[i], board_index
+
+#### MAIN EXECUTION ####
+with open('data', 'r') as fp:
+    for i,line in enumerate(fp):
+
+        if(i == 0):
+            numbers = line.strip().split(',')
+        elif(len(line.strip()) == 0):
+            if(len(temp_board) > 0): # i.e. skip the first, empty one
+                # add in the next player board
+                boards.append(temp_board)
+                temp_board = []
+                # create a blank answer board for this player board
+                for j in range(0,5):
+                    temp_board.append([False, False, False, False, False])
+                fills.append(temp_board);
+                temp_board = []
+            board_index = board_index + 1
+        else:
+            # add the next array of numbers to the temporary board object
+            temp_board.append(line.strip().split())
+
+winning_number,winning_board_index = FindWinner(numbers)
+print('Winning Number:', winning_number, ', Winning Board Index: ', winning_board_index)
+
+total = 0
+for y in range(0, len(fills[winning_board_index])):
+    for x in range(0, len(fills[winning_board_index][y])): # assumes size is same for all columns
+        if(not fills[winning_board_index][y][x]):
+            total = total + int(boards[winning_board_index][y][x])
+
+print(total * int(winning_number))
+
+# # DEBUG(dev): Show full contents of all boards
+# for x in range(0, len(boards)):
+#     for y in range(0, len(boards[x])):
+#         for z in range(0, len(boards[x][y])):
+#             print(boards[x][y][z])
diff --git a/2021/4/main2.py b/2021/4/main2.py
new file mode 100644
index 0000000..0cd11a0
--- /dev/null
+++ b/2021/4/main2.py
@@ -0,0 +1,83 @@
+# all the numbers called, in order
+numbers = []
+
+temp_board = []
+boards = []
+fills = []
+
+board_index = 0
+
+####
+def Victory(board):
+    for y in range(0, len(board)):
+        if(board[y] == [True, True, True, True, True]):
+            return True;
+
+    # NOTE(dev): Assumes all columns are the same length
+    for x in range(0, len(board[0])):
+        num_true = 0
+        for y in range(0, len(board)):
+            if(board[y][x]):
+                num_true = num_true + 1
+        if(num_true == len(board[0])):
+            return True
+
+    return False
+
+####
+def FindWinner(numbers):
+    indexes = []
+    winning_indexes = []
+    for i in range(0, len(boards)):
+        indexes.append(i)
+    for i in range(0, len(numbers)):
+        for board_index in range(0, len(boards)):
+            if(board_index not in winning_indexes):
+                for y in range(0, len(boards[board_index])):
+                    for x in range(0, len(boards[board_index][y])):
+                        if(boards[board_index][y][x] == numbers[i]):
+                            fills[board_index][y][x] = True
+                            if(Victory(fills[board_index])):
+                                print('Victory with', numbers[i], 'on board', board_index, '!!')
+                                winning_indexes.append(int(board_index))
+                                indexes.remove(int(board_index))
+                                if(len(indexes) == 0):
+                                    return numbers[i], board_index
+
+#### MAIN EXECUTION ####
+with open('data', 'r') as fp:
+    for i,line in enumerate(fp):
+
+        if(i == 0):
+            numbers = line.strip().split(',')
+        elif(len(line.strip()) == 0):
+            if(len(temp_board) > 0): # i.e. skip the first, empty one
+                # add in the next player board
+                boards.append(temp_board)
+                temp_board = []
+                # create a blank answer board for this player board
+                for j in range(0,5):
+                    temp_board.append([False, False, False, False, False])
+                fills.append(temp_board);
+                temp_board = []
+            board_index = board_index + 1
+        else:
+            # add the next array of numbers to the temporary board object
+            temp_board.append(line.strip().split())
+
+winning_number,winning_board_index = FindWinner(numbers)
+print('Winning Number:', winning_number, ', Winning Board Index: ', winning_board_index)
+
+total = 0
+for y in range(0, len(fills[winning_board_index])):
+    for x in range(0, len(fills[winning_board_index][y])): # assumes size is same for all columns
+        if(not fills[winning_board_index][y][x]):
+            total = total + int(boards[winning_board_index][y][x])
+
+print(total * int(winning_number))
+
+# # DEBUG(dev): Show full contents of all boards
+# for x in range(0, len(boards)):
+#     for y in range(0, len(boards[x])):
+#         for z in range(0, len(boards[x][y])):
+#             print(boards[x][y][z])