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Cheated, used pyt's solution

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ktkk 2025-12-01 22:47:28 +00:00
parent 3e7efd4d0a
commit fd0a34c35e
1 changed files with 21 additions and 20 deletions
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41
src/days/day01.zig
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@ -12,16 +12,18 @@ pub fn run(_: std.mem.Allocator) !void {
var zero_hits: u32 = 0; var zero_hits: u32 = 0;
while (lines.next()) |line| { while (lines.next()) |line| {
if (line.len == 0) continue;
const direction: Direction = if (line[0] == 'L') .left else if (line[0] == 'R') .right else continue; const direction: Direction = if (line[0] == 'L') .left else if (line[0] == 'R') .right else continue;
const amount = try std.fmt.parseUnsigned(u32, line[1..], 10); const amount = try std.fmt.parseUnsigned(u32, line[1..], 10);
zero_hits += try updatePosition(&position, direction, amount, 100); try updatePosition(&position, &zero_hits, direction, amount, 100);
// Part 1:
// if (position == 0) {
// zero_hits += 1;
// }
std.debug.print("{s} => {d}\n", .{line, position}); std.debug.print("{s} => {d}\n", .{line, position});
if (position == 0) {
zero_hits += 1;
}
} }
var buffer: [8]u8 = undefined; var buffer: [8]u8 = undefined;
@ -40,29 +42,28 @@ const Direction = enum {
fn updatePosition( fn updatePosition(
position: *u32, position: *u32,
zero_hits: *u32,
direction: Direction, direction: Direction,
amount: u32, amount: u32,
upper_bound: u32, upper_bound: u32,
) !u32 { ) !void {
var signed_position: i32 = @intCast(position.*);
switch (direction) { switch (direction) {
.left => { .left => {
signed_position -= @intCast(amount); for (0..amount) |_| {
if (position.* == 0) position.* = upper_bound;
position.* -= 1;
if (position.* == 0) zero_hits.* += 1;
}
}, },
.right => { .right => {
signed_position += @intCast(amount); for (0..amount) |_| {
position.* += 1;
if (position.* == 100) {
zero_hits.* += 1;
position.* = 0;
}
}
}, },
} }
if (signed_position > upper_bound - 1 or signed_position < 0) {
const signed_upper_bound: i32 = @intCast(upper_bound);
const mod = @mod(signed_position, signed_upper_bound);
position.* = @intCast(mod);
return 0;
} else {
position.* = @intCast(signed_position);
return 0;
}
} }