Solve day08
Created by voroskoi on December 8, 2022
5FITZYLXP6RMEMO3HJU4TQAEE7H355H2TNJJAM2GCNNUC4VZBJBQC Dependencies
In channels
main
Change contents
Replacement in src/main.zig at line 5 [3.50]
Insertion in src/main.zig at line 15 [3.50]
Insertion in src/main.zig at line 26 [3.50]
File addition: day08.txt
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addition: day08.zig
[3.15]const std = @import("std");const Str = []const u8;const PATH = "input/day08.txt";const ROWS = 99;const COLS = 99;const GridType = u4;pub fn first(allocator: std.mem.Allocator) !usize {_ = allocator;var th: TreeHouse = undefined;th.grid = try parseGrid(@embedFile(PATH));var counter: usize = 0;for (th.grid) |line, row| {for (line) |_, col| {if (th.checkTree(row, col)) counter += 1;}}return counter;}pub fn second(allocator: std.mem.Allocator) !usize {_ = allocator;var th: TreeHouse = undefined;th.grid = try parseGrid(@embedFile(PATH));var max: usize = 0;for (th.grid) |line, row| {for (line) |_, col| {const val = th.scenicTree(row, col);if (val > max) max = val;}}return max;}test "day08a" {try std.testing.expectEqual(@as(usize, 1849), try first(std.testing.allocator));}test "day08b" {try std.testing.expectEqual(@as(usize, 201600), try second(std.testing.allocator));}fn parseGrid(in: Str) ![ROWS][COLS]GridType {var grid: [ROWS][COLS]GridType = undefined;var lines = std.mem.tokenize(u8, in, "\n");var row: usize = 0;while (lines.next()) |line| : (row += 1) {for (line) |_, col| {grid[row][col] = try std.fmt.parseUnsigned(GridType, line[col .. col + 1], 10);}}return grid;}const TreeHouse = struct {grid: [ROWS][COLS]GridType,const directions = [4][2]i2{.{ -1, 0 },.{ 1, 0 },.{ 0, -1 },.{ 0, 1 },};fn checkTree(self: @This(), row: usize, col: usize) bool {if (row == 0 or col == 0 or row == ROWS - 1 or col == COLS - 1) {return true;}const val = self.grid[row][col];for (directions) |dir| {var row_diff: isize = @intCast(isize, row);var col_diff: isize = @intCast(isize, col);while (true) {row_diff += dir[0];if (row_diff < 0 or row_diff == ROWS) break;col_diff += dir[1];if (col_diff < 0 or col_diff == COLS) break;if (val <= self.grid[@intCast(usize, row_diff)][@intCast(usize, col_diff)])break;if (row_diff == 0 or col_diff == 0 or row_diff == ROWS - 1 or col_diff == COLS - 1) {return true;}}}return false;}fn scenicTree(self: @This(), row: usize, col: usize) usize {if (row == 0 or col == 0 or row == ROWS - 1 or col == COLS - 1) {return 0;}const val = self.grid[row][col];var scenic: usize = 1;for (directions) |dir| {var row_diff: isize = @intCast(isize, row);var col_diff: isize = @intCast(isize, col);var trees: usize = 0;while (true) {row_diff += dir[0];if (row_diff < 0 or row_diff == ROWS) break;col_diff += dir[1];if (col_diff < 0 or col_diff == COLS) break;trees += 1;if (val <= self.grid[@intCast(usize, row_diff)][@intCast(usize, col_diff)]) {scenic *= trees;break;}if (row_diff == 0 or col_diff == 0 or row_diff == ROWS - 1 or col_diff == COLS - 1) {scenic *= trees;break;}}}return scenic;}};const test_input =\\30373\\25512\\65332\\33549\\35390;