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Erik Guzman
Erik Guzman

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Advent Of Code Stream 12/20/19

#adventofcode #ruby

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Today Objectives

✅ To have a good time as Christmas holiday time creeps up

✅ Start working on some Advent of Code challenges for fun today https://adventofcode.com/2019

Stream Standup

This will be my second year trying to do any Advent of Code challenges so I am curious to see how far we can get today.

Since the last stream wrote a couple of articles posted to dev.to

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Notes

Advent of code challenge was fun. Made it through day one and day two of the problems.

Day one, part 2 ended up being a little more challenging since I was accidentally double count the initial fuel needed for the mass when calculation fuel needed for the added fuel mass.

Day two went really smoothly. It actually reminded me of my time in college, dealing with Assembly and Compiler class. Those classes heavily dealt with deal with memory space, instruction sets, and operation on the memory space. So when getting to part 2 it was really simple.

All the code isnt pretty but it gets the job code

Day 1: # Day 1 ## Part 1 def fuel_need(mass) (mass/3).floor - 2 end def part1 total_fuel_needs = 0 file = File.open("1-input.txt") file.each do |mass| total_fuel_needs = total_fuel_needs + fuel_need(mass.to_i) end file.close total_fuel_needs end total_fuel = part1 puts "Part 1: #{total_fuel}" # 3150224 ## Part 2 def calculate_fuels_need(fuel) print fuel total_fuel = 0 current_fuels_mass = fuel loop do current_fuels_mass = fuel_need(current_fuels_mass) break if current_fuels_mass <= 0 print " + " print current_fuels_mass total_fuel = total_fuel + current_fuels_mass end puts "" total_fuel end def part2 total_fuel_needs = 0 file = File.open("1-input.txt") file.each do |module_mass| fuel_for_mass = fuel_need(module_mass.to_i) total_fuel_needs = calculate_fuels_need(fuel_for_mass) end file.close total_fuel_needs end puts "Part 2: #{part2}" 
Day 2: # Intcode: Command sep values # opcodes: 1, 2, 99 # 99: exit # Other codes mean error # 1: Add operation - 1,indexV1,indexV2,storeIndex # 1: Multi operation - 1,indexV1,indexV2,storeIndex # 4 bit memory space INSTRUCTION_SIZE = 4 EXIT_CODE = 99 ADD_CODE = 1 MUTLI_CODE = 2 def add!(instruction, memory) left_value_address = instruction[1] right_value_address = instruction[2] result_value_address = instruction[3] result = memory[left_value_address] + memory[right_value_address] memory[result_value_address] = result end def multi!(instruction, memory) left_value_address = instruction[1] right_value_address = instruction[2] result_value_address = instruction[3] result = memory[left_value_address] * memory[right_value_address] memory[result_value_address] = result end def process(intcode) pointer = 0 loop do opcode = intcode[pointer] if opcode == ADD_CODE instruction = intcode.slice(pointer, INSTRUCTION_SIZE) add!(instruction, intcode) elsif opcode == MUTLI_CODE instruction = intcode.slice(pointer, INSTRUCTION_SIZE) multi!(instruction, intcode) elsif opcode == EXIT_CODE break; end pointer += INSTRUCTION_SIZE end intcode end def part1 File.open("2-input.txt", "r") do |f| f.each_line do |intcode| intcodeArray = intcode.split(',') intcodeArray.map!{ |v| v.to_i } result = process(intcodeArray) return result.join(',') end end end puts "Part1: #{part1}" def part2(expectation) File.open("2-input.txt", "r") do |f| f.each_line do |intcode| intcodeArray = intcode.split(',') intcodeArray.map!{ |v| v.to_i } for noun in 0..99 do for verb in 0..99 do new_memory_set = Array.new(intcodeArray) new_memory_set[1] = noun new_memory_set[2] = verb result = process(new_memory_set) return 100 * noun + verb if result[0] == expectation end end end end end puts "Part2: #{part2(19690720)}"

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