Add solution for day11
Created by voroskoi on April 26, 2022
VTRGPZ3FCD2U55EF5K5TJYCCCROPEOARPVAT7TF7ZFFEU42CL5MQC Dependencies
In channels
main
Change contents
Insertion in src/main_test.zig at line 12 [3.55]
Insertion in src/main.zig at line 14 [3.129]
Replacement in src/main.zig at line 17 [3.129]
File addition: day11.zig
[3.15]const std = @import("std");const PATH = "../input/day11.txt";const Str = []const u8;const Seat = enum {floor,empty,occupied,};const GRID_ROWS = 93;const GRID_COLS = 97;const Grid = struct {grd: [GRID_ROWS][GRID_COLS]Seat,const directions = [_][2]i2{.{ -1, -1 },.{ -1, 0 },.{ -1, 1 },.{ 1, -1 },.{ 1, 0 },.{ 1, 1 },.{ 0, -1 },.{ 0, 1 },};fn countOccupied(self: @This()) usize {var sum: usize = 0;for (self.grd) |gr| {for (gr) |item| {if (item == .occupied) sum += 1;}}return sum;}fn adjacentOccupied(self: @This(), row: usize, col: usize) u4 {var ret: u4 = 0;for (directions) |d| {const diffrow = @intCast(isize, row) + d[0];if (diffrow < 0 or diffrow >= GRID_ROWS) continue;const diffcol = @intCast(isize, col) + d[1];if (diffcol < 0 or diffcol >= GRID_COLS) continue;if (self.grd[@intCast(usize, diffrow)][@intCast(usize, diffcol)] == .occupied) ret += 1;}return ret;}fn seenOccupied(self: @This(), row: usize, col: usize) u4 {var ret: u4 = 0;for (directions) |d| {var diffrow = @intCast(isize, row);var diffcol = @intCast(isize, col);while (true) {diffrow += d[0];if (diffrow < 0 or diffrow >= GRID_ROWS) break;diffcol += d[1];if (diffcol < 0 or diffcol >= GRID_COLS) break;switch (self.grd[@intCast(usize, diffrow)][@intCast(usize, diffcol)]) {.occupied => {ret += 1;break;},.empty => break,.floor => continue,}}}return ret;}};pub fn first(allocator: ?std.mem.Allocator) anyerror!usize {_ = allocator;var grid = parseInput(@embedFile(PATH));while (true) {var next_grid = grid.grd;var changed = false;for (grid.grd) |grid_row, row| {for (grid_row) |item, col| {switch (item) {.empty => {if (grid.adjacentOccupied(row, col) == 0) {next_grid[row][col] = .occupied;changed = true;}},.occupied => {if (grid.adjacentOccupied(row, col) >= 4) {next_grid[row][col] = .empty;changed = true;}},.floor => {},}}}grid.grd = next_grid;if (!changed) break;}return grid.countOccupied();}pub fn second(allocator: ?std.mem.Allocator) anyerror!usize {_ = allocator;var grid = parseInput(@embedFile(PATH));while (true) {var next_grid = grid.grd;var changed = false;for (grid.grd) |grid_row, row| {for (grid_row) |item, col| {switch (item) {.empty => {if (grid.seenOccupied(row, col) == 0) {next_grid[row][col] = .occupied;changed = true;}},.occupied => {if (grid.seenOccupied(row, col) >= 5) {next_grid[row][col] = .empty;changed = true;}},.floor => {},}}}grid.grd = next_grid;if (!changed) break;}return grid.countOccupied();}fn parseInput(input: Str) Grid {var lines = std.mem.tokenize(u8, input, "\n");var grid: Grid = undefined;var row: usize = 0;while (lines.next()) |line| : (row += 1) {for (line) |ch, col| {grid.grd[row][col] = switch (ch) {'.' => .floor,'L' => .empty,'#' => .occupied,else => unreachable,};}}return grid;}test "day11a" {try std.testing.expectEqual(@as(usize, 2316), try first(std.testing.allocator));}test "day11b" {try std.testing.expectEqual(@as(usize, 2128), try second(std.testing.allocator));}File addition: day11.txt
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