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Code Issues Activity

day 6, 7; working on 8

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TheGeneralist 2024-12-23 22:04:32 +01:00
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120
day8/day8.zig Normal file
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const std = @import("std");
const in = @embedFile("test");
const Point = struct {
value: u8,
overlaps: bool,
x: i32,
y: i32,
};
fn get_point(grid: *std.ArrayList(std.ArrayList(Point)), x: i32, y: i32) error{NotFound}!Point {
for (grid.items) |line| {
for (line.items) |point| {
if (point.x == x and point.y == y) {
return point;
}
}
}
return error.NotFound;
}
pub fn main() !void {
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
const ally = gpa.allocator();
defer _ = gpa.deinit();
var grid = std.ArrayList(std.ArrayList(Point)).init(ally);
defer {
for (grid.items) |l| {
l.deinit();
}
grid.deinit();
}
var points = std.AutoArrayHashMap(u8, std.ArrayList(*Point)).init(ally);
defer {
var iter = points.iterator();
while (iter.next()) |p| {
p.value_ptr.deinit();
}
points.deinit();
}
var in_lines = std.mem.tokenize(u8, in, "\n");
var y: i32 = 0;
var x: i32 = 0;
while (in_lines.next()) |l| {
x = @intCast(l.len);
var line = std.ArrayList(Point).init(ally);
for (l, 0..) |c, _x| {
if (c == '.') {
try line.append(Point{
.value = c,
.overlaps = false,
.x = @intCast(_x),
.y = y,
});
} else {
var point = Point{
.value = c,
.overlaps = false,
.x = @intCast(_x),
.y = y,
};
try line.append(point);
var entry = try points.getOrPut(c);
if (!entry.found_existing) {
entry.value_ptr.* = std.ArrayList(*Point).init(ally);
}
try entry.value_ptr.append(&point);
}
}
try grid.append(line);
y += 1;
}
var points_iter = points.iterator();
while (points_iter.next()) |p| {
const items = p.value_ptr.*;
for (items.items) |p1| {
for (items.items) |p2| {
if (p1 == p2) continue;
const dx = p2.x - p1.x;
const dy = p2.y - p1.y;
const x3 = p2.x + dx;
const y3 = p2.y + dy;
if (y3 < 0 or y3 >= y or x3 < 0 or x3 >= x) continue;
var point = get_point(&grid, x3, y3) catch continue;
if (point.value == '.') {
point.value = '#';
} else {
point.overlaps = true;
}
}
}
}
// TODO: overlapping
var amount: u32 = 0;
for (grid.items) |row| {
for (row.items) |p| {
if (p.value == '#' or p.overlaps == true) {
amount += 1;
}
// std.debug.print("{s}", .{[_]u8{p.value}});
std.debug.print("{d}", .{@intFromBool(p.overlaps)});
}
std.debug.print(" -- amount: {d}\n", .{amount});
}
std.debug.print("{d}\n", .{2});
}

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......#....#
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