Add advent code for 2020 days 1-4

day_3/info.md

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+https://adventofcode.com/2020/day/3

day_3/part_1.py

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+with open("input") as f:
+	hill = f.read().split("\n")
+
+# Index deltas
+slope = [
+	1, # the change in vertical height of the toboggan
+	3  # the change in horizontal distance of the toboggan
+]
+
+# The starting position of the toboggan
+position = [0, 0]
+
+tree_count = 0
+
+
+while position[0] < len(hill):
+
+	# Wrap the pattern as needed
+	if position[1] >= len(hill[position[0]]):
+		position[1] -= len(hill[position[0]])
+
+	# Check for trees
+	if hill[position[0]][position[1]] == "#":
+		tree_count += 1
+
+
+	position[0] += slope[0]
+	position[1] += slope[1]
+
+print(f"Trees Hit: {tree_count}")

day_3/part_2.py

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+with open("input") as f:
+	hill = f.read().split("\n")
+
+# Index deltas
+slopes = [
+	[1, 1], # right 1, down 1
+	[1, 3], # right 3, down 1
+	[1, 5], # right 5, down 1
+	[1, 7], # right 7, down 1
+	[2, 1]  # right 1, down 2
+]
+
+# The starting position of the toboggan
+
+tree_counts = []
+
+for slope in slopes:
+
+	position = [0, 0]
+	tree_count = 0
+
+	while position[0] < len(hill):
+
+		# Wrap the pattern as needed
+		if position[1] >= len(hill[position[0]]):
+			position[1] -= len(hill[position[0]])
+
+		# Check for trees
+		if hill[position[0]][position[1]] == "#":
+			tree_count += 1
+
+
+		position[0] += slope[0]
+		position[1] += slope[1]
+
+	tree_counts.append(tree_count)
+
+total = 1
+for x in tree_counts:
+	total *= x
+print(tree_counts, total)