From 40798151a955ec3e94aa5d96700de07565404cfb Mon Sep 17 00:00:00 2001 From: Dustin Swan Date: Fri, 15 Dec 2023 12:05:48 -0700 Subject: [PATCH] Day 14. Took me a looong time to figure out how to use the map right for some reason --- day14/data.txt | 100 ++++++++++++++++++++++++++++ day14/main.zig | 177 +++++++++++++++++++++++++++++++++++++++++++++++++ day14/test.txt | 10 +++ 3 files changed, 287 insertions(+) create mode 100644 day14/data.txt create mode 100644 day14/main.zig create mode 100644 day14/test.txt diff --git a/day14/data.txt b/day14/data.txt new file mode 100644 index 0000000..a4b4ee3 --- /dev/null +++ b/day14/data.txt @@ -0,0 +1,100 @@ +.....O..#....O.O.....OO#...#.....#...........O#..OO...#O##..#.....#...O.OO...#.O......OO#...OO...O.. +OOO....#O.#..O#.#.OO...OO..O##...O.....O.O...#.O.......OOO.O...#.....#.#.O....O.O.....#...#.OOOO.O.. +...O..#...#O..#......O#.......#..O##O.#....##......O.O...O..#O.O..##..#..#O......##...OO.#.O#..O...# +.O..#...##O..#....#...O.O...#........O.O..#...O..#O.O.....#O...OO.#....O..O....OO##OO#...O#.O#...#.# 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std.ArrayList(std.ArrayList(u8)).init(allocator); + defer grid.deinit(); + + var grid2 = std.ArrayList(std.ArrayList(u8)).init(allocator); + defer grid2.deinit(); + + var lines = std.mem.split(u8, content, "\n"); + + while (lines.next()) |line| { + if (line.len < 1) { + break; + } + + var lineArrayList = std.ArrayList(u8).init(allocator); + var lineArrayList2 = std.ArrayList(u8).init(allocator); + + for (line) |char| { + try lineArrayList.append(char); + try lineArrayList2.append(char); + } + + try grid.append(lineArrayList); + try grid2.append(lineArrayList2); + } + + var map = std.StringHashMap(usize).init(allocator); + defer map.deinit(); + + transpose(&grid); + try tiltWest(&grid); + transpose(&grid); + + var part1 = calculateLoad(grid); + + std.debug.print("part 1: {d}\n", .{part1}); + + var prev: usize = 0; + var loop: usize = 0; + + const MAX = 1_000_000_000; + for (0..MAX) |i| { + // see if this grid arrangement is in our map + const key = try getKey(&grid2); + const hashed = map.get(key); + + // if it is, we've found a loop + if (hashed) |val| { + prev = val; + loop = i; + break; + } + + try cycle(&grid2); + + // add the new grid arrangement to the map + try map.put(key, i); + } + + // figure out where in the loop we should stop + const stop = (MAX - prev) % (loop - prev); + + // cycle that many more times + for (0..stop) |_| { + try cycle(&grid2); + } + var part2 = calculateLoad(grid2); + + std.debug.print("part 2: {d}\n", .{part2}); +} + +fn getKey(grid: *std.ArrayList(std.ArrayList(u8))) ![]u8 { + var gpa = std.heap.GeneralPurposeAllocator(.{}){}; + const allocator = gpa.allocator(); + + var str = std.ArrayList(u8).init(allocator); + for (grid.items) |row| { + try str.appendSlice(row.items); + } + return str.items; +} + +fn cycle(grid: *std.ArrayList(std.ArrayList(u8))) !void { + transpose(grid); // to tilt north, transpose so north is left + try tiltWest(grid); + + transpose(grid); // to tilt west, transpose again + + try tiltWest(grid); + // at this point, grid is back to normal + flipY(grid); // to tilt south, flip (south is up) then transpose (south is left) + transpose(grid); + + try tiltWest(grid); + // at this point, south is left, west is up. we want east left + transpose(grid); // south is up, west is left + flipY(grid); // grid is back to normal + flipX(grid); + try tiltWest(grid); + flipX(grid); +} + +fn calculateLoad(grid: std.ArrayList(std.ArrayList(u8))) usize { + var load: usize = 0; + for (grid.items, 0..) |row, rowNum| { + var rowMultiplier = grid.items.len - rowNum; + for (row.items) |cell| { + if (cell == 'O') { + load += rowMultiplier; + } + } + } + + return load; +} + +fn tiltWest(grid: *std.ArrayList(std.ArrayList(u8))) !void { + for (grid.items) |row| { + for (row.items, 0..) |cell, i| { + if (cell == 'O' and i != 0 and row.items[i - 1] == '.') { + var j = i; + while (j > 0) { + row.items[j - 1] = 'O'; + row.items[j] = '.'; + j -= 1; + if (j < 1 or row.items[j - 1] != '.') { + break; + } + } + } + } + } +} + +// assumes square grid +fn transpose(grid: *std.ArrayList(std.ArrayList(u8))) void { + const length = grid.items.len; + + for (0..length - 1) |i| { + for (i + 1..length) |j| { + const temp = grid.items[i].items[j]; + grid.items[i].items[j] = grid.items[j].items[i]; + grid.items[j].items[i] = temp; + } + } +} + +// flip a grid upside down +fn flipY(grid: *std.ArrayList(std.ArrayList(u8))) void { + const height = grid.items.len; + + for (0..height / 2) |r| { + const temp = grid.items[r]; + grid.items[r] = grid.items[height - r - 1]; + grid.items[height - r - 1] = temp; + } +} + +// flip a grid left to right +fn flipX(grid: *std.ArrayList(std.ArrayList(u8))) void { + const length = grid.items.len; + + for (0..length) |r| { + for (0..length / 2) |c| { + const temp = grid.items[r].items[c]; + grid.items[r].items[c] = grid.items[r].items[length - c - 1]; + grid.items[r].items[length - c - 1] = temp; + } + } +} diff --git a/day14/test.txt b/day14/test.txt new file mode 100644 index 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