Restructure repo and update solutions to zig 0.10.1HEADmaster

4 files changed, 958 insertions, 0 deletions

diff --git a/src/05/input b/src/05/input
new file mode 100644
index 0000000..6cd6f33
--- /dev/null
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diff --git a/src/05/main.zig b/src/05/main.zig
new file mode 100644
index 0000000..30f491f
--- /dev/null
+++ b/src/05/main.zig
@@ -0,0 +1,52 @@
+const std = @import("std");
+const aoc = @import("aoc");
+
+const row_count = 128;
+const col_count = 8;
+
+// Input is coded in a way that we can do an implicit binary search by replacing
+// identifiers for the lower half with "0" and for the upper half with "1"
+// See commit <f1b717029cf3262c1fa2760124af258924d668da> for actual binary search
+
+fn code2Id(input: []const u8) !u32 {
+    var value: u32 = 0;
+    for (input) |c|
+        value = value * 2 + @boolToInt(c == 'B' or c == 'R');
+    return value;
+}
+
+fn part1(allocator: std.mem.Allocator, input: []u8, args: [][]u8) !?[]u8 {
+    _ = args;
+
+    var lineit = std.mem.tokenize(u8, input, "\n");
+    var answer: u32 = 0;
+    while (lineit.next()) |line| {
+        const id = try code2Id(line[0..10]);
+        answer = std.math.max(answer, id);
+    }
+
+    return try std.fmt.allocPrint(allocator, "{d}", .{answer});
+}
+
+fn part2(allocator: std.mem.Allocator, input: []u8, args: [][]u8) !?[]u8 {
+    _ = args;
+
+    var lineit = std.mem.tokenize(u8, input, "\n");
+    var seats = [_]u1{0} ** (row_count * col_count);
+    var min: u32 = std.math.inf_u32;
+    while (lineit.next()) |line| {
+        const id = try code2Id(line);
+        min = std.math.min(min, id);
+        seats[id] = 1;
+    }
+
+    for (seats[min..]) |_, i| {
+        if (seats[min + i] == 0) {
+            return try std.fmt.allocPrint(allocator, "{d}", .{min + i});
+        }
+    }
+
+    return null;
+}
+
+pub const main = aoc.main(part1, part2, .{ "850", "599" });
diff --git a/src/05/part1 b/src/05/part1
new file mode 100644
index 0000000..83d0f49
--- /dev/null
+++ b/src/05/part1
@@ -0,0 +1,53 @@
+--- Day 5: Binary Boarding ---
+
+You board your plane only to discover a new problem: you dropped your boarding pass! You aren't sure
+which seat is yours, and all of the flight attendants are busy with the flood of people that
+suddenly made it through passport control.
+
+You write a quick program to use your phone's camera to scan all of the nearby boarding passes (your
+puzzle input); perhaps you can find your seat through process of elimination.
+
+Instead of zones or groups, this airline uses binary space partitioning to seat people.
+A seat might be specified like FBFBBFFRLR, where F means "front", B means "back", L means "left",
+and R means "right".
+
+The first 7 characters will either be F or B; these specify exactly one of the 128 rows
+on the plane (numbered 0 through 127). Each letter tells you which half of a region the given seat
+is in. Start with the whole list of rows; the first letter indicates whether the seat is in the
+front (0 through 63) or the back (64 through 127). The next letter
+indicates which half of that region the seat is in, and so on until you're left with exactly one
+row.
+
+For example, consider just the first seven characters of FBFBBFFRLR:
+
+- Start by considering the whole range, rows 0 through 127. - F means to take the lower
+half, keeping rows 0 through 63. - B means to take the upper half, keeping rows 32
+through 63. - F means to take the lower half, keeping rows 32 through 47. - B means to
+take the upper half, keeping rows 40 through 47. - B keeps rows 44 through 47. - F
+keeps rows 44 through 45. - The final F keeps the lower of the two, row 44.
+
+The last three characters will be either L or R; these specify exactly one of the 8
+columns of seats on the plane (numbered 0 through 7). The same process as above proceeds again,
+this time with only three steps. L means to keep the lower half, while R means to keep
+the upper half.
+
+For example, consider just the last 3 characters of FBFBBFFRLR:
+
+- Start by considering the whole range, columns 0 through 7. - R means to take the upper
+half, keeping columns 4 through 7. - L means to take the lower half, keeping
+columns 4 through 5. - The final R keeps the upper of the two, column 5.
+
+So, decoding FBFBBFFRLR reveals that it is the seat at row 44, column 5.
+
+Every seat also has a unique seat ID: multiply the row by 8, then add the column. In
+this example, the seat has ID 44 * 8 + 5 = 357.
+
+Here are some other boarding passes:
+
+- BFFFBBFRRR: row 70, column 7, seat ID 567. - FFFBBBFRRR: row 14, column 7, seat ID 119. -
+BBFFBBFRLL: row 102, column 4, seat ID 820.
+
+As a sanity check, look through your list of boarding passes. What is the highest seat ID
+on a boarding pass?
+
+
diff --git a/src/05/part2 b/src/05/part2
new file mode 100644
index 0000000..f34c2db
--- /dev/null
+++ b/src/05/part2
@@ -0,0 +1,14 @@
+--- Part Two ---
+
+Ding! The "fasten seat belt" signs have turned on. Time to find your seat.
+
+It's a completely full flight, so your seat should be the only missing boarding pass in your list.
+However, there's a catch: some of the seats at the very front and back of the plane don't exist on
+this aircraft, so they'll be missing from your list as well.
+
+Your seat wasn't at the very front or back, though; the seats with IDs +1 and -1 from yours will be
+in your list.
+
+What is the ID of your seat?
+
+