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2015: Day 1 complete
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2015/day1.txt
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2015/day1.txt
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2015/day1.zig
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55
2015/day1.zig
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const std = @import("std");
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fn part1(directions: std.ArrayList(u8), floor: *i16) void {
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for (directions.items) |direction| {
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if (direction == '(') {
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floor.* += 1;
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} else if (direction == ')') {
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floor.* -= 1;
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}
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}
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}
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fn part2(directions: std.ArrayList(u8), pos: *i16) void {
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var floor: i16 = 0;
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for (directions.items) |direction| {
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if (direction == '(') {
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floor += 1;
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} else if (direction == ')') {
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floor -= 1;
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}
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pos.* += 1;
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if (floor == -1) break;
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}
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}
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pub fn main() !void {
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const file = try std.fs.cwd().openFile("day1.txt", .{});
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defer file.close();
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var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
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defer arena.deinit();
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const alloc = arena.allocator();
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var buf = std.io.bufferedReader(file.reader());
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var directions = std.ArrayList(u8).init(alloc);
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defer directions.deinit();
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while (true) {
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buf.reader().streamUntilDelimiter(directions.writer(), '\n', null) catch |err| switch (err) {
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error.EndOfStream => break,
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else => return err,
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};
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}
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var floor: i16 = 0;
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var position: i16 = 0;
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part1(directions, &floor);
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part2(directions, &position);
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std.debug.print("Ending floor: {d}\n", .{floor});
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std.debug.print("Position when first entering basement: {d}\n", .{position});
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}
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