Day 2

1 files changed, 41 insertions, 0 deletions

diff --git a/src/days/2/2.zig b/src/days/2/2.zig
new file mode 100644
index 0000000..ae2f2ff
--- /dev/null
+++ b/src/days/2/2.zig
@@ -0,0 +1,41 @@
+const std = @import("std");
+
+
+
+pub fn main() !void {
+
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    const allocator = gpa.allocator();
+
+    const buf = @embedFile("input");
+
+    var ranges = std.mem.tokenizeScalar(u8, buf[0..(buf.len-1)], ',');
+
+
+    var sum: u64 = 0;
+    var sump1: u64 = 0;
+    while (ranges.next()) |range| {
+        var ranges_split = std.mem.tokenizeScalar(u8, range, '-');
+        const num1 = try std.fmt.parseInt(u64, ranges_split.next().?, 10);
+        const num2 = try std.fmt.parseInt(u64, ranges_split.next().?, 10);
+        for (num1..num2+1) |num| {
+            const numstr: []u8 = try std.fmt.allocPrint(allocator, "{d}", .{num});
+            for(2..numstr.len+1) |n| {
+                if (numstr.len % n != 0) continue;
+                const incr: usize = numstr.len/n;
+                var i: usize = 0;
+                const valid = while (i+incr*2 < numstr.len+1) : (i += incr) {
+                    if (!std.mem.eql(u8, numstr[i..i+incr], numstr[i+incr..i+incr+incr])) {
+                        break true;
+                    }
+                } else false;
+                if (!valid) {
+                    sum += num;
+                    if (n == 2) sump1 += num;
+                    break;
+                }
+            }
+        }
+    }
+    std.debug.print("{} {}\n", .{sump1, sum});
+}