day 1

3 files changed, 4345 insertions, 0 deletions

diff --git a/src/day-1/input.txt b/src/day-1/input.txt
new file mode 100644
index 0000000..4a17c03
--- /dev/null
+++ b/src/day-1/input.txt
@@ -0,0 +1,4269 @@
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diff --git a/src/day-1/part-1.zig b/src/day-1/part-1.zig
new file mode 100644
index 0000000..84c23e2
--- /dev/null
+++ b/src/day-1/part-1.zig
@@ -0,0 +1,32 @@
+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 at: i32 = 50;
+    var z: u64 = 0;
+
+    while(try reader.readUntilDelimiterOrEof(&buffer, '\n')) |line| {
+        const num = line[1..];
+
+        var spin = try std.fmt.parseInt(i32, num, 10);
+        spin = @mod(spin, 100);
+        if(line[0] == 'L') spin = -spin;
+        at += spin;
+        if(at < 0) at = 100 - -at;
+        if(at > 99) at = at - 100;
+        
+        if(at == 0) z += 1;
+        //std.debug.print("{s} {d} {d}\n", .{line, spin, at});         
+    }
+    std.debug.print("{d}\n", .{z});
+}
diff --git a/src/day-1/part-2.zig b/src/day-1/part-2.zig
new file mode 100644
index 0000000..7d8e145
--- /dev/null
+++ b/src/day-1/part-2.zig
@@ -0,0 +1,44 @@
+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 at: i32 = 50;
+    var z: u64 = 0;
+
+    while(try reader.readUntilDelimiterOrEof(&buffer, '\n')) |line| {
+        const num = line[1..];
+
+        var spin = try std.fmt.parseInt(i32, num, 10);
+        const rem = @divFloor(spin, 100);
+        spin = @mod(spin, 100);
+        if(line[0] == 'L') spin = -spin;
+        const start = at;
+        at += spin;
+
+        var over = false;
+        if(at < 0) {
+            at = 100 - -at;
+            over = true;
+        }
+        if(at > 99) {
+            at = at - 100;
+            over = true;
+        }
+
+        if(over and start != 0) z += 1; 
+        z += @intCast(rem);
+        if(!over and at == 0) z += 1;
+        //std.debug.print("{s} {d} {d} {d}\n", .{line, spin, at, z});         
+    }
+    std.debug.print("{d}\n", .{z});
+}