day 6, 7; working on 8

day8/day8.zig

@@ -0,0 +1,120 @@
+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});
+}

day8/in

@@ -0,0 +1,50 @@
+.....wV....q.....................................n
+.......w......q.h.....Vn.........................D
+............w.S..G.....................DT.........
+......S........h......e..T.....y......D...........
+......m.......Ae.......T........o.................
+....m....S........................................
+...m..........................n........8..........
+.........2...G......................n.............
+..2........V.......h................Q.............
+............................o.....................
+.Z......I..U....e...u.....G....o..................
+...N..G.........................................y.
+.....I............q.......h...................s...
+......U........qI....o.V..Rz........8........k....
+......d.Z.........................R.......8y......
+.........e..............T.....l...................
+.......2.........................u...R............
+.....d.............................Q..............
+...................v.....................s.Q....M.
+........2..........4.....................8..7.k...
+...........x..N..................A..........k.....
+...........ZN...........v...............K.........
+...d.......N.....................Ky.6.............
+...........................l6.....................
+....L....g.................4.......k..K.......0...
+..............L...........4R................s.....
+U......r..............H.4.........................
+.......U.............a.......H.............u......
+......xY...............l..........................
+...................................6..u...........
+........Y......L......l............0..............
+......9..L...........A.....v..HEa........K........
+..................v........6.EX.............z.....
+d..Y.............m......A.........................
+......................a.i......M...........z......
+...................g.......................0......
+...............................H.........i........
+..........3................W........E...i...0.....
+.................t.a....g.................5.......
+.r...t...........................7.....5..........
+....................................7....5........
+....................g.Y...wMz.....................
+9..........O....3................W.7..E..XD...1...
+t..............3.x.....9..........W.M.............
+...9............W.................................
+Z.............x................X.i......5.........
+...........3.....................................1
+...................O.......s....X.................
+..............r...................................
+..........................O.................1.....

day8/test

@@ -0,0 +1,12 @@
+......#....#
+...#....0...
+....#0....#.
+..#....0....
+....0....#..
+.#....A.....
+...#........
+#......#....
+........A...
+.........A..
+..........#.
+..........#.