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+...##...####..# +########....##. +##.##.##..##..# +.##..##.##....# +#.#..#.##.#..#. +.#.##.#...####. +.#.##.#...####. + +..#..##..#..#...# +#.#..##.#....#.## +##.#...###..###.. +##...#..##..##..# +#.###.##.####.##. +###...##..##..##. +######..######..# +######..######..# +###...##..##..##. +#.###.##.####.##. +##...#..##..##..# + +#.#.##...#. +#..#.##..#. +#..#...#... +#..#...#... +#..#.##..#. +#.#.##...#. +##..#.##.## +#.##.###.## +###..##...# +#.#.##..##. +#..#.#.#### +#..#.#.#### +..#.##..##. + +..#.#.#.#..#.#. +##.#.#...##...# +...#...#....#.. +..#............ +###.#..##..##.. +......#..##..#. +####.#..#..#..# +###.#..######.. +...#...##..##.. +..##.########## +##....##....##. +###..#.#....#.# +###.#..#.##.#.. +..##..##....##. +...#..#.####.#. +#.#####......## +..#..#...##...# + +#..####.... +####.###### +.......#... +....#...#.. +####....... +#..#.....## +#..#...#### +#######.... +....###.#.# +.........## +.....#.##.. +######..### +#..##..##.. +#..###.#... +#..#.#..... +#..###.##.. +#..#..#.#.. + +#...##.#.## +#...##.#.## +.###..#.#.# +##.###..#.. +..#...##..# +....##.#### +##.###.#.#. +##.###...#. +....##.#### +..#...##..# +##.###..#.. +.###..#.#.# +#...##.#.## diff --git a/2023/day13/main.go b/2023/day13/main.go new file mode 100644 index 0000000..7c676eb --- /dev/null +++ b/2023/day13/main.go @@ -0,0 +1,194 @@ +package main + +import ( + "fmt" + + h "git.bullercodeworks.com/brian/adventofcode/helpers" +) + +func main() { + inp := h.StdinToStringSlice() + part1(inp) + fmt.Println() + part2(inp) +} + +func part1(input []string) { + var maps []*h.CoordByteMap + var wrkInput []string + bld := func() { + m := h.StringSliceToCoordByteMap(wrkInput) + maps = append(maps, &m) + wrkInput = []string{} + } + for i := range input { + if len(input[i]) == 0 { + bld() + } else { + wrkInput = append(wrkInput, input[i]) + } + } + if len(wrkInput) > 0 { + bld() + } + + var result int + for _, m := range maps { + result += findMirror(m, -1) + } + fmt.Println("# Part 1") + fmt.Println(result) +} + +func part2(input []string) { + var maps []*h.CoordByteMap + var wrkInput []string + bld := func() { + m := h.StringSliceToCoordByteMap(wrkInput) + maps = append(maps, &m) + wrkInput = []string{} + } + for i := range input { + if len(input[i]) == 0 { + bld() + } else { + wrkInput = append(wrkInput, input[i]) + } + } + if len(wrkInput) > 0 { + bld() + } + + var result int + for _, m := range maps { + result += checkForSmudge(m) + } + fmt.Println("# Part 2") + fmt.Println(result) +} + +func checkForSmudge(m *h.CoordByteMap) int { + origMirror := findMirror(m, -1) + for y := m.TLY; y <= m.BRY; y++ { + for x := m.TLX; x <= m.BRX; x++ { + orig := m.Get(c(x, y)) + switch orig { + case '#': + m.Put(c(x, y), '.') + case '.': + m.Put(c(x, y), '#') + } + res := findMirror(m, origMirror) + if res > 0 && res != origMirror { + return res + } + m.Put(c(x, y), orig) + } + } + return 0 +} + +// findMirror finds a mirror in the map +// returning the value of that mirror (vertical (x+1), horizontal (y+1)* 100) +func findMirror(m *h.CoordByteMap, exclude int) int { + var found bool + for x := m.TLX; x <= m.BRX; x++ { + val := (x + 1) + if found = checkForVerticalMirror(m, x, x+1); found && val != exclude { + return x + 1 + } + } + for y := m.TLY; y <= m.BRY; y++ { + val := (y + 1) * 100 + if found = checkForHorizontalMirror(m, y, y+1); found && val != exclude { + return (y + 1) * 100 + } + } + return 0 +} + +func c(x, y int) h.Coordinate { + return h.Coordinate{X: x, Y: y} +} + +func checkForVerticalMirror(m *h.CoordByteMap, x1, x2 int) bool { + var wrkX1, wrkX2 int + for y := m.TLY; y <= m.BRY; y++ { + wrkX1, wrkX2 = x1, x2 + var match, cont bool + for wrkX1 >= m.TLX || wrkX2 <= m.BRX { + if match, cont = hPointsMatch(m, y, wrkX1, wrkX2); match { + if cont { + break + } + wrkX1-- + wrkX2++ + } else { + return false + } + } + if cont { + continue + } + if wrkX1 < m.TLX || wrkX2 > m.BRX { + return false + } + } + // Mirrors _shouldn't_ be at the very edge (or else what are we even doing here) + if wrkX1 == m.BRX || wrkX2 == m.TLX { + return false + } + return true +} + +func hPointsMatch(m *h.CoordByteMap, y, x1, x2 int) (bool, bool) { + c1, c2 := c(x1, y), c(x2, y) + // If either is off the map, it could be + if m.Opt(c1, byte(0)) == 0 || m.Opt(c2, byte(0)) == 0 { + return true, true + } + // Check if (x1, y) == (x2, y) + v1, v2 := m.Get(c1), m.Get(c2) + return v1 == v2, false +} + +func checkForHorizontalMirror(m *h.CoordByteMap, y1, y2 int) bool { + var wrkY1, wrkY2 int + for x := m.TLX; x <= m.BRX; x++ { + wrkY1, wrkY2 = y1, y2 + var match, cont bool + for wrkY1 >= m.TLY || wrkY2 <= m.BRY { + if match, cont = vPointsMatch(m, x, wrkY1, wrkY2); match { + if cont { + break + } + wrkY1-- + wrkY2++ + } else { + return false + } + } + if cont { + continue + } + if wrkY1 > m.TLY && wrkY2 < m.BRY { + return false + } + } + // Mirrors _shouldn't_ be at the very edge (or else what are we even doing here) + if wrkY1 == m.BRY || wrkY2 == m.TLY { + return false + } + return true +} + +func vPointsMatch(m *h.CoordByteMap, x, y1, y2 int) (bool, bool) { + c1, c2 := c(x, y1), c(x, y2) + // If either is off the map, it could be + if m.Opt(c1, byte(0)) == 0 || m.Opt(c2, byte(0)) == 0 { + return true, true + } + // Check if (x, y1) == (x, y2) + v1, v2 := m.Get(c1), m.Get(c2) + return v1 == v2, false +} diff --git a/2023/day13/problem b/2023/day13/problem new file mode 100644 index 0000000..1d43fbb --- /dev/null +++ b/2023/day13/problem @@ -0,0 +1,222 @@ + [1]Advent of Code + + • [2][About] + • [3][Events] + • [4][Shop] + • [5][Settings] + • [6][Log Out] + + br0xen [7](AoC++) 26* + +       /*[8]2023*/ + + • [9][Calendar] + • [10][AoC++] + • [11][Sponsors] + • [12][Leaderboard] + • [13][Stats] + + Our [14]sponsors help make Advent of Code possible: + [15]Jane Street - Will our next great idea come from you? We hire smart, + humble people who love to solve problems, build systems, and test + theories. Our success is driven by our people and we never stop improving. + +--- Day 13: Point of Incidence --- + + With your help, the hot springs team locates an appropriate spring which + launches you neatly and precisely up to the edge of Lava Island. + + There's just one problem: you don't see any lava. + + You do see a lot of ash and igneous rock; there are even what look like + gray mountains scattered around. After a while, you make your way to a + nearby cluster of mountains only to discover that the valley between them + is completely full of large mirrors. Most of the mirrors seem to be + aligned in a consistent way; perhaps you should head in that direction? + + As you move through the valley of mirrors, you find that several of them + have fallen from the large metal frames keeping them in place. The mirrors + are extremely flat and shiny, and many of the fallen mirrors have lodged + into the ash at strange angles. Because the terrain is all one color, it's + hard to tell where it's safe to walk or where you're about to run into a + mirror. + + You note down the patterns of ash (.) and rocks (#) that you see as you + walk (your puzzle input); perhaps by carefully analyzing these patterns, + you can figure out where the mirrors are! + + For example: + + #.##..##. + ..#.##.#. + ##......# + ##......# + ..#.##.#. + ..##..##. + #.#.##.#. + + #...##..# + #....#..# + ..##..### + #####.##. + #####.##. + ..##..### + #....#..# + + To find the reflection in each pattern, you need to find a perfect + reflection across either a horizontal line between two rows or across a + vertical line between two columns. + + In the first pattern, the reflection is across a vertical line between two + columns; arrows on each of the two columns point at the line between the + columns: + + 123456789 + >< + #.##..##. + ..#.##.#. + ##......# + ##......# + ..#.##.#. + ..##..##. + #.#.##.#. + >< + 123456789 + + In this pattern, the line of reflection is the vertical line between + columns 5 and 6. Because the vertical line is not perfectly in the middle + of the pattern, part of the pattern (column 1) has nowhere to reflect onto + and can be ignored; every other column has a reflected column within the + pattern and must match exactly: column 2 matches column 9, column 3 + matches 8, 4 matches 7, and 5 matches 6. + + The second pattern reflects across a horizontal line instead: + + 1 #...##..# 1 + 2 #....#..# 2 + 3 ..##..### 3 + 4v#####.##.v4 + 5^#####.##.^5 + 6 ..##..### 6 + 7 #....#..# 7 + + This pattern reflects across the horizontal line between rows 4 and 5. Row + 1 would reflect with a hypothetical row 8, but since that's not in the + pattern, row 1 doesn't need to match anything. The remaining rows match: + row 2 matches row 7, row 3 matches row 6, and row 4 matches row 5. + + To summarize your pattern notes, add up the number of columns to the left + of each vertical line of reflection; to that, also add 100 multiplied by + the number of rows above each horizontal line of reflection. In the above + example, the first pattern's vertical line has 5 columns to its left and + the second pattern's horizontal line has 4 rows above it, a total of 405. + + Find the line of reflection in each of the patterns in your notes. What + number do you get after summarizing all of your notes? + + Your puzzle answer was 27742. + +--- Part Two --- + + You resume walking through the valley of mirrors and - SMACK! - run + directly into one. Hopefully nobody was watching, because that must have + been pretty embarrassing. + + Upon closer inspection, you discover that every mirror has exactly one + smudge: exactly one . or # should be the opposite type. + + In each pattern, you'll need to locate and fix the smudge that causes a + different reflection line to be valid. (The old reflection line won't + necessarily continue being valid after the smudge is fixed.) + + Here's the above example again: + + #.##..##. + ..#.##.#. + ##......# + ##......# + ..#.##.#. + ..##..##. + #.#.##.#. + + #...##..# + #....#..# + ..##..### + #####.##. + #####.##. + ..##..### + #....#..# + + The first pattern's smudge is in the top-left corner. If the top-left # + were instead ., it would have a different, horizontal line of reflection: + + 1 ..##..##. 1 + 2 ..#.##.#. 2 + 3v##......#v3 + 4^##......#^4 + 5 ..#.##.#. 5 + 6 ..##..##. 6 + 7 #.#.##.#. 7 + + With the smudge in the top-left corner repaired, a new horizontal line of + reflection between rows 3 and 4 now exists. Row 7 has no corresponding + reflected row and can be ignored, but every other row matches exactly: row + 1 matches row 6, row 2 matches row 5, and row 3 matches row 4. + + In the second pattern, the smudge can be fixed by changing the fifth + symbol on row 2 from . to #: + + 1v#...##..#v1 + 2^#...##..#^2 + 3 ..##..### 3 + 4 #####.##. 4 + 5 #####.##. 5 + 6 ..##..### 6 + 7 #....#..# 7 + + Now, the pattern has a different horizontal line of reflection between + rows 1 and 2. + + Summarize your notes as before, but instead use the new different + reflection lines. In this example, the first pattern's new horizontal line + has 3 rows above it and the second pattern's new horizontal line has 1 row + above it, summarizing to the value 400. + + In each pattern, fix the smudge and find the different line of reflection. + What number do you get after summarizing the new reflection line in each + pattern in your notes? + + Your puzzle answer was 32728. + + Both parts of this puzzle are complete! They provide two gold stars: ** + + At this point, you should [16]return to your Advent calendar and try + another puzzle. + + If you still want to see it, you can [17]get your puzzle input. + + You can also [Shareon [18]Twitter [19]Mastodon] this puzzle. + +References + + Visible links + 1. https://adventofcode.com/ + 2. https://adventofcode.com/2023/about + 3. https://adventofcode.com/2023/events + 4. https://teespring.com/stores/advent-of-code + 5. https://adventofcode.com/2023/settings + 6. https://adventofcode.com/2023/auth/logout + 7. Advent of Code Supporter + https://adventofcode.com/2023/support + 8. https://adventofcode.com/2023 + 9. https://adventofcode.com/2023 + 10. https://adventofcode.com/2023/support + 11. https://adventofcode.com/2023/sponsors + 12. https://adventofcode.com/2023/leaderboard + 13. https://adventofcode.com/2023/stats + 14. https://adventofcode.com/2023/sponsors + 15. https://www.janestreet.com/ + 16. https://adventofcode.com/2023 + 17. https://adventofcode.com/2023/day/13/input + 18. https://twitter.com/intent/tweet?text=I%27ve+completed+%22Point+of+Incidence%22+%2D+Day+13+%2D+Advent+of+Code+2023&url=https%3A%2F%2Fadventofcode%2Ecom%2F2023%2Fday%2F13&related=ericwastl&hashtags=AdventOfCode + 19. javascript:void(0); diff --git a/2023/day13/testinput b/2023/day13/testinput new file mode 100644 index 0000000..3b6b5cc --- /dev/null +++ b/2023/day13/testinput @@ -0,0 +1,15 @@ +#.##..##. +..#.##.#. +##......# +##......# +..#.##.#. +..##..##. +#.#.##.#. + +#...##..# +#....#..# +..##..### +#####.##. +#####.##. +..##..### +#....#..# diff --git a/helpers/coordinateByteMap.go b/helpers/coordinateByteMap.go index 3a92af6..71148aa 100644 --- a/helpers/coordinateByteMap.go +++ b/helpers/coordinateByteMap.go @@ -303,6 +303,20 @@ func (m CoordByteMap) Map(l func(c Coordinate, in byte) byte) CoordByteMap { } return i } +func (m CoordByteMap) RowAsString(y int) string { + var res string + for x := m.TLX; x <= m.BRX; x++ { + res = fmt.Sprintf("%s%s", res, string(m.Get(Coordinate{X: x, Y: y}))) + } + return res +} +func (m CoordByteMap) ColAsString(x int) string { + var res string + for y := m.TLY; y <= m.BRY; y++ { + res = fmt.Sprintf("%s%s", res, string(m.Get(Coordinate{X: x, Y: y}))) + } + return res +} func (m CoordByteMap) String() string { var ret string diff --git a/sbin/aoc b/sbin/aoc index 17a6df8..280d766 100755 --- a/sbin/aoc +++ b/sbin/aoc @@ -53,7 +53,6 @@ getproblem() { DY=$(echo "$CURRDAY"|awk '$0*=1') echo "Getting problem at $CURRYEAR/day/$DY" elinks -dump https://adventofcode.com/$CURRYEAR/day/$DY > problem - vim problem } getinput() {