diff --git a/aoc21/LICENSE b/aoc21/LICENSE
new file mode 100644
index 0000000..1b93a68
--- /dev/null
+++ b/aoc21/LICENSE
@@ -0,0 +1,7 @@
+Copyright 2021 Suhas
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/aoc21/d1/in.txt b/aoc21/d1/in.txt
new file mode 100644
index 0000000..3af412a
--- /dev/null
+++ b/aoc21/d1/in.txt
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diff --git a/aoc21/d1/sol.py b/aoc21/d1/sol.py
new file mode 100644
index 0000000..7bcd746
--- /dev/null
+++ b/aoc21/d1/sol.py
@@ -0,0 +1,39 @@
+file = open("in.txt", "r")
+
+lns = file.readlines()
+
+def p1():
+    count = 0
+    for i in range(1, len(lns)):
+        if int(lns[i]) >= int(lns[i-1]):
+            count += 1
+    return count
+
+def p2():
+    count = 0
+    sets = []
+    for i in range(len(lns)):
+        if i + 3 > len(lns):
+            continue
+        temp = [None] * 3
+        temp[0] = lns[i]
+        temp[1] = lns[i+1]
+        temp[2] = lns[i+2]
+        if len(sets) == 0:
+            index = 0
+        else:
+            index = len(sets) + 1
+        sets.append(temp)
+        
+    for i in range(1, len(sets)):
+        set1 = sets[i]
+        set2 = sets[i-1]
+        sum1 = int(set1[0]) + int(set1[1]) + int(set1[2])
+        sum2 = int(set2[0]) + int(set2[1]) + int(set2[2])
+        if sum1 > sum2:
+            count += 1
+    
+    return count
+
+print(f"part 1: {p1()}")
+print(f"part 2: {p2()}")
\ No newline at end of file
diff --git a/aoc21/d2/in.txt b/aoc21/d2/in.txt
new file mode 100644
index 0000000..a40e69b
--- /dev/null
+++ b/aoc21/d2/in.txt
@@ -0,0 +1,1000 @@
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\ No newline at end of file
diff --git a/aoc21/d2/sol.py b/aoc21/d2/sol.py
new file mode 100644
index 0000000..5b51abc
--- /dev/null
+++ b/aoc21/d2/sol.py
@@ -0,0 +1,42 @@
+file = open("in.txt", "r")
+lns = file.readlines()
+
+def p1():
+  depth = 0
+  horizontal = 0
+  for i in range(len(lns)):
+    d = lns[i].split()[0]
+    v = int(lns[i].split()[1])
+    if d == 'down':
+      depth += v
+    elif d == 'up':
+      depth -= v
+    elif d == 'forward':
+      horizontal += v
+  return {"depth": depth, "horizontal": horizontal}
+
+def p2():
+  depth = 0
+  horizontal = 0
+  aim = 0
+  for ln in lns:
+    d = ln.split()[0]
+    v = int(ln.split()[1])
+    if d == 'down':
+      aim += v
+    elif d == 'up':
+      aim -= v
+    elif d == 'forward':
+      horizontal += v
+      depth += aim * v 
+  return {"depth": depth, "horizontal": horizontal}
+
+# output lines
+# one = p1()
+# two = p2()
+# d1 = one['depth']
+# h1 = one['horizontal'] 
+# d2 = two['depth']
+# h2 = two['horizontal'] 
+# print(f"part 1: {d1 * h1}")
+# print(f"part 2: {d2 * h2}")
\ No newline at end of file
diff --git a/aoc21/d3/in.txt b/aoc21/d3/in.txt
new file mode 100644
index 0000000..6ed7c05
--- /dev/null
+++ b/aoc21/d3/in.txt
@@ -0,0 +1,1000 @@
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\ No newline at end of file
diff --git a/aoc21/d3/sol.py b/aoc21/d3/sol.py
new file mode 100644
index 0000000..e248cb3
--- /dev/null
+++ b/aoc21/d3/sol.py
@@ -0,0 +1,30 @@
+file = open("in.txt", "r")
+lns = [f.rstrip() for f in file.readlines()]
+
+def p1() -> int:
+    zero = [0] * 12
+    one = [0] * 12
+
+    for ln in lns:
+        for i, ch in enumerate(list(ln)):
+            if ch == "0":
+                zero[i] += 1
+            else:
+                one[i] += 1
+
+    gamma = "0b"
+    epsilon = "0b"
+
+    for i, _ in enumerate(zero):
+        if zero[i] > one[i]:
+            gamma += "0"
+            epsilon += "1"
+        else:
+            gamma += "1"
+            epsilon += "0"
+
+    return (int(gamma, 2) * int(epsilon, 2))
+
+# def p2():
+
+print(f"part 1: {p1()}")
diff --git a/aoc21/d3/test.txt b/aoc21/d3/test.txt
new file mode 100644
index 0000000..4ac1a79
--- /dev/null
+++ b/aoc21/d3/test.txt
@@ -0,0 +1,1999 @@
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