2021 start

2021/01/01.py

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+sweep = []
+
+with open("input.txt") as f:
+	lines = f.readlines()
+	for line in lines:
+		sweep.append(int(line))
+
+comparison = zip(sweep[1:],sweep)
+differences = [(d2 - d1) for d2, d1 in comparison]
+increases = [(d > 0) for d in differences]
+part1 = sum(increases)
+print(part1)
+
+window = zip(sweep,sweep[1:],sweep[2:])
+sums = [(d1 + d2 + d3) for d1, d2, d3 in window]
+comparison = zip(sums[1:],sums)
+differences = [(d2 - d1) for d2, d1 in comparison]
+increases = [(d > 0) for d in differences]
+part2 = sum(increases)
+print(part2)

2021/01/sample.txt

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+199
+200
+208
+210
+200
+207
+240
+269
+260
+263

2021/02/02.py

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+commands = []
+
+with open("input.txt") as f:
+	lines = f.readlines()
+	for line in lines:
+		commands.append(line)
+
+horizontal = depth = 0
+for command in commands:
+	instruction, amount = command.split(' ')
+	amount = int(amount)
+	if instruction == 'forward':
+		horizontal += amount
+	elif instruction == 'down':
+		depth += amount
+	elif instruction == 'up':
+		depth -= amount
+
+part1 = horizontal * depth
+print(part1)
+
+horizontal = depth = aim = 0
+for command in commands:
+	instruction, amount = command.split(' ')
+	amount = int(amount)
+	if instruction == 'down':
+		aim += amount
+	elif instruction == 'up':
+		aim -= amount
+	elif instruction == 'forward':
+		horizontal += amount
+		depth += amount*aim
+
+part2 = horizontal * depth
+print(part2)

2021/02/sample.txt

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+forward 5
+down 5
+forward 8
+up 3
+down 8
+forward 2

2021/03/03.py

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+report = []
+
+with open("input.txt") as f:
+	lines = f.read().split('\n')
+	for line in lines:
+		report.append(line)
+
+gamma = ''
+power = 2 ** len(report[0]) - 1
+
+for i in range(len(report[0])):
+    ones_count = 0
+    for number in report:
+        if number[i] == '1':
+            ones_count += 1
+
+    half = len(report) / 2
+    if ones_count > half:
+        gamma += '1'
+    else:
+        gamma += '0'
+
+gamma = int(gamma, 2)
+epsilon = power - gamma
+part1 = gamma * epsilon
+print(part1)
+
+o2 = co2 = 0

2021/03/sample.txt

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+00100
+11110
+10110
+10111
+10101
+01111
+00111
+11100
+10000
+11001
+00010
+01010