Days 1 and 2

.gitignore

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+day*.txt

2019/day1.py

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+def get_fuel(mass):
+    return mass // 3 - 2
+
+needed_fuel = 0
+with open("day1.txt", "rt") as input_file:
+    for line in input_file.readlines():
+        mass = int(line.strip())
+        fuel = get_fuel(mass)
+        needed_fuel += fuel
+
+print(needed_fuel)

2019/day2.py

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+import sys
+
+CODES = None
+with open("day2.txt", "rt") as input_file:
+    CODES = [int(i) for i in input_file.read().strip().split(",")]
+
+CODES[1] = 12
+CODES[2] = 2
+
+ip = 0
+while True:
+    code = CODES[ip]
+    if code == 1:
+        operand1_pos = CODES[ip + 1]
+        operand2_pos = CODES[ip + 2]
+        output_pos = CODES[ip + 3]
+        CODES[output_pos] = CODES[operand1_pos] + CODES[operand2_pos]
+        ip += 4
+    elif code == 2:
+        operand1_pos = CODES[ip + 1]
+        operand2_pos = CODES[ip + 2]
+        output_pos = CODES[ip + 3]
+        CODES[output_pos] = CODES[operand1_pos] * CODES[operand2_pos]
+        ip += 4
+    elif code == 99:
+        break
+    else:
+        print("Wrong opcode:", code)
+        sys.exit()
+
+print("Value at pos0:", CODES[0])

2019/fetch.py

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+import os
+import requests
+import sys
+
+if len(sys.argv) != 2:
+    print("Usage: <fetch> day")
+    sys.exit()
+day = sys.argv[1]
+
+URL = "https://adventofcode.com/2019/day/{}/input"
+SESSION_ID = os.environ["AOC_SESSION"]
+
+response = requests.get(URL.format(day), cookies={"session": SESSION_ID})
+response.raise_for_status()
+
+with open("day{}.txt".format(day), "wt") as output_file:
+    output_file.write(response.text)