day 9HEADmain

1 files changed, 42 insertions, 0 deletions

diff --git a/src/day-9/part-1.zig b/src/day-9/part-1.zig
new file mode 100644
index 0000000..2f7ea95
--- /dev/null
+++ b/src/day-9/part-1.zig
@@ -0,0 +1,42 @@
+const std = @import("std");
+
+const point = struct { x: i64, y: i64 };
+
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+    const alloc = gpa.allocator();
+    
+    const path = "input.txt";
+    const fp = try std.fs.cwd().openFile(path, .{.mode = std.fs.File.OpenMode.read_only});
+    defer fp.close();
+    var reader = fp.reader();
+
+    var buffer: [256]u8 = undefined;
+
+    var points = std.ArrayList(point).init(alloc);
+    defer points.deinit();
+
+    while(try reader.readUntilDelimiterOrEof(&buffer, '\n')) |line| {
+        const i = std.mem.indexOf(u8, line, ",").?;
+
+        const p = point{
+            .x = try std.fmt.parseInt(i64, line[0..i], 10),
+            .y = try std.fmt.parseInt(i64, line[i+1..], 10)
+        };
+
+        try points.append(p);
+    }
+
+    var largest: u64 = 0;
+
+    for(0..points.items.len) |i| {
+        for(i..points.items.len) |z| {
+            if(i == z) continue;
+
+            largest = @max(largest, (1 + @abs(points.items[i].x - points.items[z].x)) * (1 + @abs(points.items[i].y - points.items[z].y)));
+        }
+    }
+
+    std.debug.print("{}\n", .{largest});
+}