LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) <year> <copyright holders>
+Copyright (c) 2021 Noëlle Anthony
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,3 +1,3 @@
 # adventofcode2021
 
-https://adventofcode.com
+https://adventofcode.com

aoc1-1.py

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+def main():
+    """ For each depth in the list, determine whether it's deeper than the previous depth.
+        There is no previous depth for the first entry.
+        Output the total number of times the depth increased.
+    """
+    with open("aoc1-1.txt", "r") as file:
+        depths = file.readlines()
+    depths = [int(el.strip()) for el in depths]
+    prev = 999999999
+    increases = []
+    for depth in depths:
+        increases.append(1 if depth > prev else 0)
+        prev = depth
+    print(sum(increases))
+            
+
+if __name__ == "__main__":
+    main()

aoc1-2.py

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+def main():
+    """ Consider three-depth windows instead of individual depths:
+        199  A      
+        200  A B    
+        208  A B C  
+        210    B C D
+        200  E   C D
+        207  E F   D
+        240  E F G  
+        269    F G H
+        260      G H
+        263        H
+        For each window in the list, determine whether it's deeper than the previous window.
+        There is no previous depth for the first entry.
+        Output the total number of times the depth increased.
+    """
+    with open("aoc1-1.txt", "r") as file:
+        depths = file.readlines()
+    depths = [int(el.strip()) for el in depths]
+    prev = 999999999
+    increases = []
+    for i in range(len(depths)-2):
+        window = depths[i] + depths[i+1] + depths[i+2]
+        increases.append(1 if window > prev else 0)
+        prev = window
+    print(sum(increases))
+            
+
+if __name__ == "__main__":
+    main()

aoc2-1.py

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+def main():
+    """
+        horizontal position and vertical position both start at 0
+        forward X increases forward (horizontal) position by X units
+        down X increases depth (vertical position) by X units
+        up X decreases depth (vertical position) by X units
+        After following all instructions multiply final h_pos by final v_pos
+    """
+    h_pos, v_pos = 0, 0
+    instructions = []
+    with open("aoc2-1.txt", "r") as file:
+        instructions = file.readlines()
+    for inst in instructions:
+        dir, amt = inst.strip().split(" ")
+        amt = int(amt)
+        if dir == "forward":
+            h_pos += amt
+        elif dir == "down":
+            v_pos += amt
+        elif dir == "up":
+            v_pos -= amt
+        else:
+            raise ValueError(f"Unrecognized direction: {h_pos}")
+    return (h_pos * v_pos)
+
+if __name__ == "__main__":
+    print(main())

aoc2-2.py

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+def main():
+    """
+        horizontal position, vertical position, and aim both start at 0
+        forward X increases forward (horizontal) position by X units
+          AND changes depth by (X * aim) units
+        down X increases aim (vertical angle) by X units
+        up X decreases aim (vertical angle) by X units
+        After following all instructions multiply final h_pos by final v_pos
+    """
+    h_pos, v_pos, aim = 0, 0, 0
+    instructions = []
+    with open("aoc2-1.txt", "r") as file:
+        instructions = file.readlines()
+    for inst in instructions:
+        dir, amt = inst.strip().split(" ")
+        amt = int(amt)
+        if dir == "forward":
+            h_pos += amt
+            v_pos += (amt * aim)
+        elif dir == "down":
+            aim += amt
+        elif dir == "up":
+            aim -= amt
+        else:
+            raise ValueError(f"Unrecognized direction: {h_pos}")
+    return (h_pos * v_pos)
+
+if __name__ == "__main__":
+    print(main())

aoc3-1.py

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+import sys
+
+def main():
+    with open("aoc3-1.txt", "r") as file:
+        inputs = [el.strip() for el in file.readlines()]
+    digits = [[] for _ in range(len(inputs[0]))]
+    for j, ip in enumerate(inputs):
+        # print(digits, ip)
+        for i, dg in enumerate(ip):
+            # print(i, dg)
+            dg = dg.strip()
+            if dg != "":
+                digits[i].append(int(dg))
+        
+        # if j >= 2:
+        #     sys.exit(0)
+    gamma, epsilon = [], []
+    for el in digits:
+        gamma.append(1 if el.count(1) >= el.count(0) else 0)
+        epsilon.append(0 if el.count(1) >= el.count(0) else 1)
+    gamma_str = "".join([str(el) for el in gamma])
+    epsilon_str = "".join([str(el) for el in epsilon])
+    gamma_int = int(gamma_str, 2)
+    epsilon_int = int(epsilon_str, 2)
+    print(f"Gamma: {gamma_str} -- {gamma_int}")
+    print(f"Epsilon: {epsilon_str} -- {epsilon_int}")
+    print(f"Consumption: {gamma_int*epsilon_int}")
+
+if __name__ == "__main__":
+    main()

aoc3-2.py

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+def common_digit(list_of_lists: list, position: int, most=True) -> int:
+    digits = []
+    for ip in list_of_lists:
+        digits.append(int(ip[position]))
+    # print(f"1: {digits.count(1)}, 0: {digits.count(0)}", end="")
+    if not most:
+        return 0 if digits.count(1) >= digits.count(0) else 1
+    return 1 if digits.count(1) >= digits.count(0) else 0
+
+def main() -> None:
+    with open("aoc3-1.txt", "r") as file:
+        inputs = [el.strip() for el in file.readlines()]
+    digits = [[] for _ in range(len(inputs[0]))]
+    for j, ip in enumerate(inputs):
+        for i, dg in enumerate(ip):
+            dg = dg.strip()
+            if dg != "":
+                digits[i].append(int(dg))
+    gamma, epsilon = [], []
+    for el in digits:
+        gamma.append(1 if el.count(1) >= el.count(0) else 0)
+        epsilon.append(0 if el.count(1) >= el.count(0) else 1)
+    gamma_str = "".join([str(el) for el in gamma])
+    epsilon_str = "".join([str(el) for el in epsilon])
+    gamma_int = int(gamma_str, 2)
+    epsilon_int = int(epsilon_str, 2)
+    print(f"Gamma: {gamma_str} -- {gamma_int}")
+    print(f"Epsilon: {epsilon_str} -- {epsilon_int}")
+    print(f"Consumption: {gamma_int*epsilon_int}")
+    oxy_inputs = [el for el in inputs]
+    co2_inputs = [el for el in inputs]
+    i = 0
+    while len(oxy_inputs) > 1:
+        mcd = common_digit(oxy_inputs, i)
+        oxy_inputs = [el for el in oxy_inputs if el[i] == str(mcd)]
+        # print(f", MCD: {mcd}, len: {len(oxy_inputs)}")
+        i += 1
+    i = 0
+    while len(co2_inputs) > 1:
+        lcd = common_digit(co2_inputs, i, False)
+        co2_inputs = [el for el in co2_inputs if el[i] == str(lcd)]
+        # print(f", LCD: {lcd}, len: {len(co2_inputs)}")
+        i += 1
+    oxy_str, co2_str = oxy_inputs[0], co2_inputs[0]
+    oxy_int, co2_int = int(oxy_str, 2), int(co2_str, 2)
+
+    print(f"Oxygen: {oxy_str} -- {oxy_int}")
+    print(f"CO2: {co2_str} -- {co2_int}")
+    print(f"Life support: {oxy_int*co2_int}")
+
+if __name__ == "__main__":
+    main()