advent of code 2020 - day 1

aoc-2020-python-day1.py

def get_input():
  with open('1.txt') as f:
    inp = f.readlines()
  return list(map(int, map(str.strip, filter(None, inp))))

def get_answer():
  expenses = get_input()
  seen = set()

  while expenses:
    curr = expenses.pop()
    for val in seen:
      if val + curr == 2020:
        return val * curr
    seen.add(curr)
    
if __name__ == '__main__':
  print(get_answer())