Finish day07, part 1
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2 changed files with 223 additions and 2 deletions
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const std = @import("std");
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pub const title = "Day 07";
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pub const title = "Day 07: Laboratories";
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pub fn run(_: std.mem.Allocator) !void {
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pub fn run(allocator: std.mem.Allocator) !void {
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const input = @embedFile("./input/day07.txt");
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//const input =
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// \\.......S.......
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// \\...............
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// \\.......^.......
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// \\...^.^...^.^...
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// \\..^...^.....^..
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// \\.^.^.^.^.^...^.
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// \\...............
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// ;
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var lines = std.mem.tokenizeScalar(u8, input, '\n');
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const first_line = lines.next() orelse unreachable;
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const starting_position = for (first_line, 0..) |c, i| {
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if (c == 'S') break i;
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} else unreachable;
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const line_len = first_line.len;
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std.debug.print("starting_position = {d}\n", .{starting_position});
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std.debug.print("{s}\n", .{first_line});
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const previous_line = try allocator.alloc(u8, line_len);
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defer allocator.free(previous_line);
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var accumulator: usize = 0;
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var i: usize = 0;
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while (lines.next()) |line| {
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defer i += 1;
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const current_line = try allocator.alloc(u8, line_len);
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defer allocator.free(current_line);
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@memcpy(current_line, line);
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defer @memcpy(previous_line, current_line);
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defer std.debug.print("{s}\n", .{current_line});
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if (i == 0) {
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std.debug.assert(current_line[starting_position] == '.');
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current_line[starting_position] = '|';
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continue;
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}
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for (line, 0..) |c, ci| {
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if (previous_line[ci] == '|') {
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if (c == '.') {
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current_line[ci] = '|';
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} else if (c == '^') {
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accumulator += 1;
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if (ci != 0 and current_line[ci - 1] == '.') {
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current_line[ci - 1] = '|';
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}
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if (ci != line_len - 1 and current_line[ci + 1] == '.') {
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current_line[ci + 1] = '|';
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}
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}
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}
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}
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}
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var buffer: [8]u8 = undefined;
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var stdout_writer = std.fs.File.stdout().writer(&buffer);
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const stdout = &stdout_writer.interface;
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try stdout.print("{d}\n", .{accumulator});
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try stdout.flush();
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}
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142
src/days/input/day07.txt
Executable file
142
src/days/input/day07.txt
Executable file
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