diff --git a/d17.lua b/d17.lua new file mode 100644 index 0000000..27b2371 --- /dev/null +++ b/d17.lua @@ -0,0 +1,263 @@ +function get_param(state, arg) + local param_mode = state.mem[state.pos] // (10 ^ (arg + 1)) % 10 + if #state.mem < state.pos + arg then + print(string.format("Error: Opcode too short at end of memory: %d", state.pos)) + os.exit(false) + end + local arg = state.mem[state.pos + arg] + if param_mode == 0 then + arg = arg + 1 + elseif param_mode == 2 then + arg = arg + state.relbase + end + return arg +end + +function read_mem(state, arg) + local param_mode = state.mem[state.pos] // (10 ^ (arg + 1)) % 10 + local arg = get_param(state, arg) + if param_mode == 1 then + return arg + end + arg = state.mem[arg] + if not arg then + return 0 + end + return arg +end + +function write_mem(state, arg, val) + local param_mode = state.mem[state.pos] // (10 ^ (arg + 1)) % 10 + local arg = get_param(state, arg) + if param_mode == 1 then + print(string.format("Error: Invalid inmediate write: %d", arg)) + end + state.mem[arg] = val +end + +function interpret(state) + if not state.mem then + state.mem = state + end + if not state.pos then + state.pos = 1 + state.relbase = 1 + end + if not state.input then + state.input = input_stdin + end + if not state.output then + state.output = output_stdout + end + + while true do + if #state.mem < state.pos then + print(string.format("Instruction pointer ran off of memory")) + os.exit(false) + end + + local opcode = state.mem[state.pos] % 100 + local instr_size = 1 + + if opcode == 1 then + write_mem(state, 3, read_mem(state, 1) + read_mem(state, 2)) + instr_size = 4 + elseif opcode == 2 then + write_mem(state, 3, read_mem(state, 1) * read_mem(state, 2)) + instr_size = 4 + elseif opcode == 3 then + local val = state.input() + if not val then return true end + write_mem(state, 1, val) + instr_size = 2 + elseif opcode == 4 then + state.output(read_mem(state, 1)) + instr_size = 2 + elseif opcode == 5 then + instr_size = 3 + if read_mem(state, 1) ~= 0 then + state.pos = read_mem(state, 2) + 1 + instr_size = 0 + end + elseif opcode == 6 then + instr_size = 3 + if read_mem(state, 1) == 0 then + state.pos = read_mem(state, 2) + 1 + instr_size = 0 + end + elseif opcode == 7 then + write_mem(state, 3, read_mem(state, 1) < read_mem(state, 2) and 1 or 0) + instr_size = 4 + elseif opcode == 8 then + write_mem(state, 3, read_mem(state, 1) == read_mem(state, 2) and 1 or 0) + instr_size = 4 + elseif opcode == 9 then + state.relbase = state.relbase + read_mem(state, 1) + instr_size = 2 + elseif opcode == 99 then + return false + else + print(string.format("Error: Invalid opcode %d at %d", opcode, state.pos - 1)) + os.exit(false) + end + + state.pos = state.pos + instr_size + end +end + +function input_stdin() + io.stdout:write("> ") + return io.stdin:read("n") +end + +function output_stdout(val) + io.stdout:write(val) + io.stdout:write("\n") +end + +function input_array(array) + function inner() + return table.remove(array, 1) + end + return inner +end + +function output_array(array) + function inner(val) + table.insert(array, val) + end + return inner +end + +file = io.open(arg[1]) +program = {} +for num in string.gmatch(file:read(), "(-?%d+),?") do + table.insert(program, tonumber(num)) +end +file:close() + +--interpret(program) + +map = {} +line = {} +interpret({mem={table.unpack(program)}, output=function(val) + local val = string.char(val) + if val == "\n" then + table.insert(map, line) + line = {} + else + table.insert(line, val) + end +end}) + +part1 = 0 +for y = 2, #map - 1 do + for x = 2, #map[y] - 1 do + if map[y][x] == "#" and map[y-1][x] == "#" and map[y][x+1] == "#" and map[y+1][x] == "#" and map[y][x-1] == "#" then + part1 = part1 + (y-1) * (x-1) + end + end +end +print("Part 1:", part1) + +pos = nil +for y = 1, #map do + for x = 1, #map[y] do + if map[y][x] == "^" then + pos = {y=y, x=x} + break + end + end + if pos then + break + end +end + +function get_nextpos(pos, direction) + if direction == "^" then + next_pos = {y=pos.y - 1, x=pos.x} + elseif direction == ">" then + next_pos = {y=pos.y, x=pos.x + 1} + elseif direction == "v" then + next_pos = {y=pos.y + 1, x=pos.x} + elseif direction == "<" then + next_pos = {y=pos.y, x=pos.x - 1} + end + return next_pos +end + +path = {} +distance = 0 +direction = "^" +while true do + next_pos = get_nextpos(pos, direction) + + if map[next_pos.y] and map[next_pos.y][next_pos.x] == "#" then + distance = distance + 1 + pos = next_pos + else + if distance ~= 0 then + table.insert(path, distance) + distance = 0 + end + + if direction == "^" then + dir_l = "<" + dir_r = ">" + elseif direction == ">" then + dir_l = "^" + dir_r = "v" + elseif direction == "v" then + dir_l = ">" + dir_r = "<" + elseif direction == "<" then + dir_l = "v" + dir_r = "^" + end + + pos_l = get_nextpos(pos, dir_l) + pos_r = get_nextpos(pos, dir_r) + + if map[pos_l.y] and map[pos_l.y][pos_l.x] == "#" then + table.insert(path, "L") + direction = dir_l + elseif map[pos_r.y] and map[pos_r.y][pos_r.x] == "#" then + table.insert(path, "R") + direction = dir_r + else + break + end + end +end + +print(table.concat(path, ",")) +print("Compress the path manually you lazy fuck") + +function sleep(s) + local ntime = os.clock() + s + repeat until os.clock() >= ntime +end + +-- Flushing doesn't work as expected... oh well +io.stdout:flush() +io.stdout:setvbuf("full", 0x10000) + +program_p2 = {table.unpack(program)} +program_p2[1] = 2 +last_output = 0 +interpret({mem=program_p2, output=function(val) + if val >= 0x80 then + io.stdout:write(val) + io.stdout:write("\n") + else + if last_output == 10 and val == 10 then + io.stdout:flush() + sleep(0.1) + end + last_output = val + io.stdout:write(string.char(val)) + end +end, input=function() + io.stdout:flush() + return string.byte(io.stdin:read(1)) +end}) diff --git a/d17_input.txt b/d17_input.txt new file mode 100644 index 0000000..1e208df --- /dev/null +++ b/d17_input.txt @@ -0,0 +1 @@ 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diff --git a/d17_path.txt b/d17_path.txt new file mode 100644 index 0000000..50f394e --- /dev/null +++ b/d17_path.txt @@ -0,0 +1,5 @@ +R,12,L,8,R,12,R,8,R,6,R,6,R,8,R,12,L,8,R,12,R,8,R,6,R,6,R,8,R,8,L,8,R,8,R,4,R,4,R,8,L,8,R,8,R,4,R,4,R,8,R,6,R,6,R,8,R,8,L,8,R,8,R,4,R,4,R,8,R,6,R,6,R,8,R,12,L,8,R,12 +A = R,12,L,8,R,12 +B = R,8,R,6,R,6,R,8 +C = R,8,L,8,R,8,R,4,R,4 +A,B,A,B,C,C,B,C,B,A