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Day 5

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Shadowfacts 2019-12-05 13:34:06 -05:00
parent e7408ad2ff
commit 1b94a352b1
2 changed files with 206 additions and 0 deletions
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205
lib/day5/day5.ex Normal file
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defmodule Day5 do
def read_program do
File.read!("lib/day5/input.txt")
|> String.trim()
|> String.split(",")
|> Enum.map(&String.to_integer/1)
end
def run_program do
read_program()
|> run()
end
def test do
run([
3,
21,
1008,
21,
8,
20,
1005,
20,
22,
107,
8,
21,
20,
1006,
20,
31,
1106,
0,
36,
98,
0,
0,
1002,
21,
125,
20,
4,
20,
1105,
1,
46,
104,
999,
1105,
1,
46,
1101,
1000,
1,
20,
4,
20,
1105,
1,
46,
98,
99
])
end
def run(memory, ip \\ 0)
def run(memory, ip) when ip < length(memory) do
IO.inspect(memory)
case eval(Enum.drop(memory, ip), memory) do
{memory, :halt} ->
memory
{memory, :cont, offset} ->
run(memory, ip + offset)
{memory, :jump, ip} ->
run(memory, ip)
end
end
def run(memory, _ip), do: memory
defmacro opcode(op, expected) do
quote do
rem(unquote(op), 100) == unquote(expected)
end
end
def get_param(op, param, val, memory) do
place = param + 2
if op |> div(pow(10, place)) |> rem(10) == 1 do
val
else
Enum.at(memory, val)
end
end
def pow(base, 1), do: base
def pow(base, exp) do
base * pow(base, exp - 1)
end
# halt
def eval([99 | _], memory) do
{memory, :halt}
end
# add
def eval([op, a, b, dest | _], memory) when opcode(op, 1) do
a_val = get_param(op, 0, a, memory)
b_val = get_param(op, 1, b, memory)
{
List.replace_at(memory, dest, a_val + b_val),
:cont,
4
}
end
# multiply
def eval([op, a, b, dest | _], memory) when opcode(op, 2) do
a_val = get_param(op, 0, a, memory)
b_val = get_param(op, 1, b, memory)
{
List.replace_at(memory, dest, a_val * b_val),
:cont,
4
}
end
# input
def eval([3, addr | _], memory) do
res = IO.gets("intcode> ") |> String.trim() |> String.to_integer()
{
List.replace_at(memory, addr, res),
:cont,
2
}
end
# output
def eval([op, param | _], memory) when opcode(op, 4) do
get_param(op, 0, param, memory) |> IO.inspect()
{memory, :cont, 2}
end
# jump if non-zero
def eval([op, condition, ip | _], memory) when opcode(op, 5) do
case get_param(op, 0, condition, memory) do
0 ->
{memory, :cont, 3}
_ ->
{memory, :jump, get_param(op, 1, ip, memory)}
end
end
# jump if zero
def eval([op, condition, ip | _], memory) when opcode(op, 6) do
case get_param(op, 0, condition, memory) do
0 ->
{memory, :jump, get_param(op, 1, ip, memory)}
_ ->
{memory, :cont, 3}
end
end
# less than
def eval([op, a, b, dest | _], memory) when opcode(op, 7) do
a_val = get_param(op, 0, a, memory)
b_val = get_param(op, 1, b, memory)
memory =
if a_val < b_val do
List.replace_at(memory, dest, 1)
else
List.replace_at(memory, dest, 0)
end
{memory, :cont, 4}
end
# equals
def eval([op, a, b, dest | _], memory) when opcode(op, 8) do
a_val = get_param(op, 0, a, memory)
b_val = get_param(op, 1, b, memory)
memory =
if a_val == b_val do
List.replace_at(memory, dest, 1)
else
List.replace_at(memory, dest, 0)
end
{memory, :cont, 4}
end
end

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lib/day5/input.txt Normal file
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3,225,1,225,6,6,1100,1,238,225,104,0,2,171,209,224,1001,224,-1040,224,4,224,102,8,223,223,1001,224,4,224,1,223,224,223,102,65,102,224,101,-3575,224,224,4,224,102,8,223,223,101,2,224,224,1,223,224,223,1102,9,82,224,1001,224,-738,224,4,224,102,8,223,223,1001,224,2,224,1,223,224,223,1101,52,13,224,1001,224,-65,224,4,224,1002,223,8,223,1001,224,6,224,1,223,224,223,1102,82,55,225,1001,213,67,224,1001,224,-126,224,4,224,102,8,223,223,1001,224,7,224,1,223,224,223,1,217,202,224,1001,224,-68,224,4,224,1002,223,8,223,1001,224,1,224,1,224,223,223,1002,176,17,224,101,-595,224,224,4,224,102,8,223,223,101,2,224,224,1,224,223,223,1102,20,92,225,1102,80,35,225,101,21,205,224,1001,224,-84,224,4,224,1002,223,8,223,1001,224,1,224,1,224,223,223,1101,91,45,225,1102,63,5,225,1101,52,58,225,1102,59,63,225,1101,23,14,225,4,223,99,0,0,0,677,0,0,0,0,0,0,0,0,0,0,0,1105,0,99999,1105,227,247,1105,1,99999,1005,227,99999,1005,0,256,1105,1,99999,1106,227,99999,1106,0,265,1105,1,99999,1006,0,99999,1006,227,274,1105,1,99999,1105,1,280,1105,1,99999,1,225,225,225,1101,294,0,0,105,1,0,1105,1,99999,1106,0,300,1105,1,99999,1,225,225,225,1101,314,0,0,106,0,0,1105,1,99999,1008,677,677,224,1002,223,2,223,1006,224,329,101,1,223,223,1108,226,677,224,1002,223,2,223,1006,224,344,101,1,223,223,7,677,226,224,102,2,223,223,1006,224,359,1001,223,1,223,8,677,226,224,102,2,223,223,1005,224,374,1001,223,1,223,1107,677,226,224,102,2,223,223,1006,224,389,1001,223,1,223,1008,226,226,224,1002,223,2,223,1005,224,404,1001,223,1,223,7,226,677,224,102,2,223,223,1005,224,419,1001,223,1,223,1007,677,677,224,102,2,223,223,1006,224,434,1001,223,1,223,107,226,226,224,1002,223,2,223,1005,224,449,1001,223,1,223,1008,677,226,224,102,2,223,223,1006,224,464,1001,223,1,223,1007,677,226,224,1002,223,2,223,1005,224,479,1001,223,1,223,108,677,677,224,1002,223,2,223,1006,224,494,1001,223,1,223,108,226,226,224,1002,223,2,223,1006,224,509,101,1,223,223,8,226,677,224,102,2,223,223,1006,224,524,101,1,223,223,107,677,226,224,1002,223,2,223,1005,224,539,1001,223,1,223,8,226,226,224,102,2,223,223,1005,224,554,101,1,223,223,1108,677,226,224,102,2,223,223,1006,224,569,101,1,223,223,108,677,226,224,102,2,223,223,1006,224,584,1001,223,1,223,7,677,677,224,1002,223,2,223,1005,224,599,101,1,223,223,1007,226,226,224,102,2,223,223,1005,224,614,1001,223,1,223,1107,226,677,224,102,2,223,223,1006,224,629,101,1,223,223,1107,226,226,224,102,2,223,223,1005,224,644,1001,223,1,223,1108,677,677,224,1002,223,2,223,1005,224,659,101,1,223,223,107,677,677,224,1002,223,2,223,1006,224,674,1001,223,1,223,4,223,99,226