adding old leetcode solutions

1 files changed, 36 insertions, 0 deletions

diff --git a/leetcode/lc-1700-students-unable-to-eat.rkt b/leetcode/lc-1700-students-unable-to-eat.rkt
new file mode 100644
index 0000000..75cc243
--- /dev/null
+++ b/leetcode/lc-1700-students-unable-to-eat.rkt
@@ -0,0 +1,36 @@
+#lang racket
+(define/contract (count-students students sandwiches)
+  (-> (listof exact-integer?) (listof exact-integer?) exact-integer?)
+  (for/fold ([sandwich-pile sandwiches]
+             [student-line students]
+             [remaining-students (length students)]
+             [break? #false]
+             #:result remaining-students)
+            ([i (in-naturals)]
+             #:break break?)
+    (cond [(and (empty? sandwich-pile)
+                (empty? student-line))
+           (values void
+                   void
+                   remaining-students
+                   #true)]
+          [(equal? (car sandwich-pile)
+                   (car student-line))
+           (values (cdr sandwich-pile)
+                   (cdr student-line)
+                   (sub1 remaining-students)
+                   #false)]
+          [(and (not (equal? (list (car sandwich-pile))
+                        (remove-duplicates student-line)))
+                (= 1 (length (remove-duplicates student-line))))
+           (values void
+                   void
+                   remaining-students
+                   #true)]
+          [else
+           (values sandwich-pile
+                   (append (cdr student-line) (list (car student-line)))
+                   remaining-students
+                   #false)])))
+
+(count-students '(1 1 0 0) '(0 1 0 1))