Data update

Task/Rep-string/DuckDB/rep-string.duckdb

@@ -0,0 +1,36 @@
+create or replace function repString(s) as (
+  if (length(s) < 2, null,
+     (with recursive size_t as (select length(s) as size),
+      cte as
+        (select ((size % 2) + (size // 2)) as len, '' as t, false as found
+         from size_t
+         union all
+         select len-1 as len,
+                s[1:len] as t,
+                s == (repeat(s[1:len], (size // len))
+                     || coalesce(t[1:(size % len)], ''))
+                as found
+         from cte, size_t
+         where len > 0 and found = false
+       )
+       select first(t)
+       from cte
+       where found
+  ))
+);
+
+select s, repString(s)
+from unnest(
+   [
+    '1001110011',
+    '1110111011',
+    '0010010010',
+    '1010101010',
+    '1111111111',
+    '0100101101',
+    '0100100',
+    '101',
+    '11',
+    '00',
+    '1'
+    ]) _(s);