day 7

1 files changed, 40 insertions, 0 deletions

diff --git a/src/day-7/part-1.zig b/src/day-7/part-1.zig
new file mode 100644
index 0000000..327263c
--- /dev/null
+++ b/src/day-7/part-1.zig
@@ -0,0 +1,40 @@
+const std = @import("std");
+
+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 beams = std.ArrayList(usize).init(alloc);
+    defer beams.deinit();
+
+    var splits: u64 = 0;
+
+    while(try reader.readUntilDelimiterOrEof(&buffer, '\n')) |line| {
+        if(beams.items.len == 0){
+            try beams.append(std.mem.indexOf(u8, line, "S").?);
+            continue;
+        }
+
+        const ol: usize = beams.items.len;
+        for(0..ol) |i| {
+            if(line[beams.items[i]] == '^'){
+                line[beams.items[i]] = 'i';
+                splits += 1;
+                try beams.append(beams.items[i] + 1);
+                beams.items[i] -= 1;
+            } else if(line[beams.items[i]] == 'i'){
+                beams.items[i] -= 1;
+            }
+        }
+    }
+
+    std.debug.print("{d}\n", .{splits});
+}