Data update

Task/Run-length-encoding/DuckDB/run-length-encoding-1.duckdb

@@ -0,0 +1,23 @@
+create or replace function run_length_encode(str) as table
+ (WITH RECURSIVE cte AS (
+  SELECT
+    1 AS pos,
+    1 AS counter,
+    SUBSTRING(str, 1, 1) AS char,
+    SUBSTRING(str, 2, 1) AS nextc,
+  UNION ALL
+  SELECT
+    pos + 1 as pos,
+    CASE
+      WHEN nextc = char THEN counter + 1
+      ELSE 1
+    END as counter,
+    nextc as char,
+    SUBSTRING(str, 2 + pos, 1) as nextc
+  FROM cte
+  WHERE pos < LENGTH(str)
+ )
+ SELECT STRING_AGG( counter || char, '' ORDER BY pos) AS encoded_string
+ FROM cte
+ WHERE nextc != char
+ );

Task/Run-length-encoding/DuckDB/run-length-encoding-2.duckdb

@@ -0,0 +1 @@
+from run_length_encode('WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW');