diff --git a/2018/day16-input b/2018/day16-input
new file mode 100644
index 0000000..841855e
--- /dev/null
+++ b/2018/day16-input
@@ -0,0 +1,4140 @@
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diff --git a/2018/day16-input1 b/2018/day16-input1
new file mode 100644
index 0000000..8193e2d
--- /dev/null
+++ b/2018/day16-input1
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diff --git a/2018/day16-input2 b/2018/day16-input2
new file mode 100644
index 0000000..df25bcf
--- /dev/null
+++ b/2018/day16-input2
@@ -0,0 +1,950 @@
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diff --git a/2018/day16.py b/2018/day16.py
new file mode 100644
index 0000000..b3737a3
--- /dev/null
+++ b/2018/day16.py
@@ -0,0 +1,162 @@
+with open('day16-input1', 'r') as file:
+  data = [l.strip('\n') for l in file]
+with open('day16-input2', 'r') as file:
+  data2 = [l.strip('\n') for l in file]
+import numpy as np
+import re
+
+
+numbers = [[int(s) for s in re.findall(r'-?\d+', d)] for d in data if d]
+numbers2 = [[int(s) for s in re.findall(r'-?\d+', d)] for d in data2 if d]
+# arr = np.array(numbers, dtype=np.int64)
+
+registers = np.zeros(4, dtype=np.int64)
+
+def addr(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = regs[a] + regs[b]
+  return r
+
+def addi(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = regs[a] + b
+  return r
+
+def mulr(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = regs[a] * regs[b]
+  return r
+
+def muli(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = regs[a] * b
+  return r
+
+def andr(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = regs[a] & regs[b]
+  return r
+
+def andi(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = regs[a] & b
+  return r
+
+def orr(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = regs[a] | regs[b]
+  return r
+
+def ori(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = regs[a] | b
+  return r
+
+def setr(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = regs[a]
+  return r
+
+def seti(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = a
+  return r
+
+def gtir(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = int(bool(a > regs[b]))
+  return r
+
+def gtri(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = int(bool(regs[a] > b))
+  return r
+
+def gtrr(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = int(bool(regs[a] > regs[b]))
+  return r
+
+def eqir(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = int(bool(a == regs[b]))
+  return r
+
+def eqri(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = int(bool(regs[a] == b))
+  return r
+
+def eqrr(regs, opcodes):
+  op, a, b, c = opcodes
+  r = list(regs)
+  r[c] = int(bool(regs[a] == regs[b]))
+  return r
+
+instructions = [addr, addi, mulr, muli, andr, andi, orr, ori, setr, seti, gtir, gtri, gtrr, eqir, eqri, eqrr]
+
+num_3_or_more = 0
+instruction_codes = {}
+instruction_impossibilities = {}
+for before, opcodes, after in zip(numbers[::3], numbers[1::3], numbers[2::3]):
+  possibilities = set()
+  impossibilities = set()
+  for op in instructions:
+    try:
+      r2 = op(before, opcodes)
+      if r2 == after:
+        possibilities.add(op)
+      else:
+        impossibilities.add(op)
+    except:
+      impossibilities.add(op)
+  if len(possibilities) >= 3:
+    num_3_or_more += 1
+
+  if opcodes[0] in instruction_codes:
+    instruction_codes[opcodes[0]] &= possibilities
+  else:
+    instruction_codes[opcodes[0]] = set(possibilities)
+
+  if opcodes[0] in instruction_impossibilities:
+    instruction_impossibilities[opcodes[0]] |= impossibilities
+  else:
+    instruction_impossibilities[opcodes[0]] = set(impossibilities)
+
+print(num_3_or_more)  # Part 1
+
+for k in instruction_codes:
+  instruction_codes[k] -= instruction_impossibilities[k]
+while sum([len(i) for i in instruction_codes.values()]) > len(instructions):
+  for code, cands in instruction_codes.items():
+    if len(cands) == 1:
+      for code2 in [c for c in instruction_codes if c != code]:
+        instruction_codes[code2] -= cands
+
+opcode_convert = {code: list(s)[0] for code, s in instruction_codes.items()}
+
+regs = [0, 0, 0, 0]
+for i, opcodes in enumerate(numbers2):
+  try:
+    regs = opcode_convert[opcodes[0]](regs, opcodes)
+  except:
+    print(f'Line {i}: {regs}  {opcodes}')
+    raise
+
+print(regs)  # Part 2 is first number
+