feat: days 1 2 3 done with duckdb

solutions/01.sql

@@ -0,0 +1,69 @@
+set preserve_insertion_order = true;
+
+create or replace table day01_data as
+  select operation,
+    if(operation[1] == 'L', -1, 1) as multiplier,
+    operation[2:]::int as add
+  from read_csv(
+    'inputs/01/input.txt',
+    header = false,
+    columns = { 'operation': 'VARCHAR' }
+  );
+
+create or replace table day01_test as
+  select operation,
+    if(operation[1] == 'L', -1, 1) as multiplier,
+    operation[2:]::int as add
+  from read_csv(
+    'inputs/01/test.txt',
+    header = false,
+    columns = { 'operation': 'VARCHAR' }
+  );
+
+create or replace table day01_data_states as
+  select
+    rowid,
+    operation,
+    multiplier,
+    add as raw_add,
+    floor(add / 100)::int as turns,
+    add - (turns * 100) as clean_add,
+    50 + SUM(clean_add * multiplier) OVER (
+      ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW
+    ) as state
+  from day01_data
+;
+
+with
+states as (
+  select
+    lag(abs(state + 100) % 100, 1, 50) over () as previous,
+    operation,
+    turns,
+    abs(state + 100) % 100 as state
+  from day01_data_states
+)
+select count(1) as part1
+from states
+where state == 0;
+
+--------------
+
+create or replace table day01_part2 as
+select
+  lag(state, 1, 50) over () as raw_previous,
+  state as raw_current,
+  operation,
+  raw_previous % 100 == 0 as went_from_zero,
+  floor(raw_previous / 100)::int as prev_hundred,
+  floor(raw_current / 100)::int as current_hundred,
+  if(not went_from_zero and prev_hundred != current_hundred, 1, NULL) as hundred_change,
+  if((state + 100) % 100 == 0, 1, NULL) as exact_0,
+  turns,
+  turns + coalesce(exact_0, hundred_change, 0) as total_zero_clicks
+from day01_data_states;
+
+select
+  sum(total_zero_clicks) as part2
+from day01_part2;
+