feat: days 1 2 3 done with duckdb

solutions/02.sql

@@ -0,0 +1,49 @@
+create or replace table day02_data as
+with input1 as (
+select unnest(split(column0, ',')) as ranges
+from read_csv('inputs/02/input.txt', header=false, delim='\n'))
+select
+  split(ranges, '-')[1]::long as range_start,
+  split(ranges, '-')[2]::long as range_end
+from input1;
+
+create or replace table day02_test as
+with input1 as (
+select unnest(split(column0, ',')) as ranges
+from read_csv('inputs/02/test.txt', header=false, delim='\n'))
+select
+  split(ranges, '-')[1]::long as range_start,
+  split(ranges, '-')[2]::long as range_end
+from input1;
+
+create or replace table day02_product_list as
+select unnest(generate_series(range_start, range_end))::string as product_id
+from day02_data;
+
+select sum(product_id::long) as part1
+from day02_product_list
+where LENGTH(product_id) % 2 == 0
+ and product_id[:(LENGTH(product_id)/2)] == product_id[(LENGTH(product_id)/2)+1:];
+
+with split_lengths as (
+select product_id, 
+  length(product_id) as len,
+  (
+    select array_agg(l)
+    from generate_series(1, length(product_id)-1) as t(l)
+    where length(product_id) % l == 0
+  ) as lengths
+from day02_product_list
+),
+with_chunks as (
+select product_id, chunk_size,
+  (
+    select array_agg(substring(product_id, (j-1)*chunk_size+1, chunk_size))
+     from generate_series(1, ceil(length(product_id)/chunk_size)::int) as u(j)
+  ) as chunks
+FROM split_lengths, unnest(lengths) as t(chunk_size)
+)
+select sum(distinct product_id::long) as part2
+from with_chunks
+where length(array_distinct(chunks)) = 1
+;