[TASK] Finally finished day 1 with very ugly zig code xD

day1-zig/input/day1_example2.txt

@@ -0,0 +1,4 @@
+L1000
+L50
+R50
+R50

day1-zig/src/main.zig

@@ -3,37 +3,109 @@
 //! is to delete this file and start with root.zig instead.
 
 pub fn main() !void {
-    // Prints to stderr (it's a shortcut based on `std.io.getStdErr()`)
-    std.debug.print("All your {s} are belong to us.\n", .{"codebase"});
+    const part1Solution = try part1("input/day1.txt");
+    std.debug.print("Part1:{}\n", .{part1Solution});
 
-    // stdout is for the actual output of your application, for example if you
-    // are implementing gzip, then only the compressed bytes should be sent to
-    // stdout, not any debugging messages.
-    const stdout_file = std.io.getStdOut().writer();
-    var bw = std.io.bufferedWriter(stdout_file);
-    const stdout = bw.writer();
-
-    try stdout.print("Run `zig build test` to run the tests.\n", .{});
-
-    try bw.flush(); // Don't forget to flush!
+    const part2Solution = try part2("input/day1.txt");
+    std.debug.print("Part2:{}\n", .{part2Solution});
 }
 
-fn parse(input) 
+fn part1(path: []const u8) !i32 {
+    var file = try std.fs.cwd().openFile(path, .{});
+    defer file.close();
 
-test "Part 1 sample" {
-    const input = try std.fs.cwd().readFile("day1_example.txt", .{});
+    var buf_reader = std.io.bufferedReader(file.reader());
+    var in_stream = buf_reader.reader();
 
-}
+    var pos: i32 = 50;
+    var count: i32 = 0;
 
-test "fuzz example" {
-    const Context = struct {
-        fn testOne(context: @This(), input: []const u8) anyerror!void {
-            _ = context;
-            // Try passing `--fuzz` to `zig build test` and see if it manages to fail this test case!
-            try std.testing.expect(!std.mem.eql(u8, "canyoufindme", input));
+    var buf: [100]u8 = undefined;
+    while (try in_stream.readUntilDelimiterOrEof(&buf, '\n')) |line| {
+        const shift = try std.fmt.parseInt(i32, line[1..], 10);
+        if (line[0] == 'L') {
+            pos -= shift;
+            while (pos < 0) {
+                pos += 100;
             }
-    };
-    try std.testing.fuzz(Context{}, Context.testOne, .{});
+        } else {
+            pos += shift;
+            pos = @mod(pos, 100);
+        }
+        if (pos == 0) {
+            count += 1;
+        }
+    }
+    return count;
 }
 
+fn part2(path: []const u8) !i32 {
+    var file = try std.fs.cwd().openFile(path, .{});
+    defer file.close();
+
+    var buf_reader = std.io.bufferedReader(file.reader());
+    var in_stream = buf_reader.reader();
+
+    var pos: i32 = 50;
+    var count: i32 = 0;
+
+    var buf: [100]u8 = undefined;
+    while (try in_stream.readUntilDelimiterOrEof(&buf, '\n')) |line| {
+        var shift = try std.fmt.parseInt(i32, line[1..], 10);
+        if (shift > 100) {
+            count += @divFloor(shift, 100);
+            shift = @mod(shift, 100);
+        }
+        const startPos = pos;
+        if (line[0] == 'L') {
+            pos -= shift;
+            if (pos < 0) {
+                pos += 100;
+                if (startPos != 0) {
+                    count += 1;
+                }
+            }
+        } else {
+            pos += shift;
+            if (pos > 100) {
+                count += 1;
+                pos = @mod(pos, 100);
+            } else if (pos == 100) {
+                pos = 0;
+            }
+        }
+        if (pos == 0) {
+            count += 1;
+        }
+        std.debug.print("pos: {}, count: {}\n", .{ pos, count });
+    }
+    return count;
+}
+
+test "Part 1 example" {
+    const res = try part1("input/day1_example.txt");
+    try std.testing.expect(res == 3);
+}
+
+test "Part 2 example" {
+    const res = try part2("input/day1_example.txt");
+    try std.testing.expect(res == 6);
+}
+
+test "Part 2 example 2" {
+    const res = try part2("input/day1_example2.txt");
+    try std.testing.expect(res == 12);
+}
+
+// test "fuzz example" {
+//     const Context = struct {
+//         fn testOne(context: @This(), input: []const u8) anyerror!void {
+//             _ = context;
+//             // Try passing `--fuzz` to `zig build test` and see if it manages to fail this test case!
+//             try std.testing.expect(!std.mem.eql(u8, "canyoufindme", input));
+//         }
+//     };
+//     try std.testing.fuzz(Context{}, Context.testOne, .{});
+// }
+
 const std = @import("std");