adding old leetcode solutions

1 files changed, 7 insertions, 0 deletions

diff --git a/leetcode/lc-944-delete-columns.rkt b/leetcode/lc-944-delete-columns.rkt
new file mode 100644
index 0000000..f9714b7
--- /dev/null
+++ b/leetcode/lc-944-delete-columns.rkt
@@ -0,0 +1,7 @@
+#lang racket
+(define/contract (min-deletion-size strs)
+  (-> (listof string?) exact-integer?)
+  (define transposed-strs (apply map list (map string->list strs)))
+  (count (λ (s) (not (equal? s (sort s char<?)))) transposed-strs))
+
+(min-deletion-size '["cba" "daf" "ghi"])