1 files changed, 88 insertions, 0 deletions
diff --git a/src/day07.zig b/src/day07.zig
new file mode 100644
index 0000000..620aaa3
--- /dev/null
+++ b/src/day07.zig
@@ -0,0 +1,88 @@
+const std = @import("std");
+const print = std.debug.print;
+
+pub fn solve(part: []u8, reader: *std.Io.Reader, allocator: std.mem.Allocator) !void {
+    if (std.mem.eql(u8, part, "1")) {
+        try part1(reader, allocator);
+    } else {
+        try part2(reader, allocator);
+    }
+}
+
+fn part1(reader: *std.Io.Reader, allocator: std.mem.Allocator) !void {
+    var output: usize = 0;
+
+    const first = try reader.takeDelimiter('\n');
+
+    var space = try allocator.alloc(bool, first.?.len);
+    defer allocator.free(space);
+
+    for (space) |*b| b.* = false;
+
+    space[(first.?.len - 1) / 2] = true;
+
+    while (reader.takeDelimiter('\n')) |line| {
+        if (line == null) {
+            break;
+        }
+
+        for (line.?,0..) |e, i| {
+            if (e == '^' and space[i]) {
+                space[i] = false;
+                space[i-1] = true;
+                space[i+1] = true;
+                output += 1;
+            }
+        }
+
+    } else |_| {}
+
+    print("{d}\n", .{output});
+}
+
+fn quantum(space: [][]u8, pos: usize, y: usize, output: *usize) void {
+
+    if (space.len == y){
+        return;
+    }
+
+    if (space[y][pos] == '^') {
+        quantum(space, pos - 1, y + 1, output);
+        output.* += 1;
+        quantum(space, pos + 1, y + 1, output);
+    } else {
+        quantum(space, pos, y + 1, output);
+    }
+}
+
+
+fn part2(reader: *std.Io.Reader, allocator: std.mem.Allocator) !void {
+    var output: usize = 1;
+
+    const first = try reader.takeDelimiter('\n');
+
+    var space = try allocator.alloc(usize, first.?.len);
+    defer allocator.free(space);
+
+    for (space) |*b| b.* = 0;
+
+    space[(first.?.len - 1) / 2] = 1;
+
+    while (reader.takeDelimiter('\n')) |line| {
+        if (line == null) {
+            break;
+        }
+
+        for (line.?,0..) |e, i| {
+            if (e == '^' and space[i] > 0) {
+                space[i-1] += space[i];
+                space[i+1] += space[i];
+                output += space[i];
+                space[i] = 0;
+            }
+        }
+
+    } else |_| {}
+
+    print("{d}\n", .{output});
+}