package main import ( "fmt" h "git.bullercodeworks.com/brian/adventofcode/helpers" ) func main() { inp := h.StdinToStringSlice() total := 1 for _, slope := range []h.Coordinate{ {X: 1, Y: 1}, {X: 3, Y: 1}, {X: 5, Y: 1}, {X: 7, Y: 1}, {X: 1, Y: 2}, } { field := h.StringSliceToCoordByteMap(inp) val := countTrees(field, slope.X, slope.Y) total = total * val fmt.Println(slope.X, slope.Y, ":", val, "Trees") } fmt.Println("Total:", total) } func countTrees(field h.CoordByteMap, x, y int) int { trees := 0 pos := h.Coordinate{X: x, Y: y} for pos.Y < field.Height { if pos.X >= field.Width { pos.X = pos.X - field.Width } if field.Get(pos) == '#' { trees++ field.Put(pos, 'X') } else { field.Put(pos, 'O') } pos.Y = pos.Y + y pos.X = pos.X + x } return trees }