992 B
992 B
Day 5: Hydrothermal Venture
Part one
- Parse input and output a list of pairs of points.
- Remove diagonal lines by filtering the list using the condition that
p1.x == p2.x or p1.y == p2.y - Count overlapping points
- Create a dictionary that uses the point coordinate as a key and contains an integer
nfor each key - Iterate over each line in the input, adding 1 to
nfor each coordinate in the line- The coordinates were founid by computing the x and y deltas between the two points that made up the line
- The sign of the deltas determines the direction we step in
- We then step through each point in the line based on the step directions until the final point is encountered
- Iterate over all keys in the dictionary and count every point where
n > 1
- Create a dictionary that uses the point coordinate as a key and contains an integer
Part two
The same as part one, but without the list filtering step.
Involved literal napkin maths.
