1 files changed, 0 insertions, 105 deletions
diff --git a/Semestr 2/racket/leftist.rkt b/Semestr 2/racket/leftist.rkt
deleted file mode 100644
index 78319e4..0000000
--- a/Semestr 2/racket/leftist.rkt
+++ /dev/null
@@ -1,105 +0,0 @@
-#lang racket
-
-(provide make-elem elem-priority elem-val empty-heap heap-insert heap-merge heap-min heap-pop heap-empty?)
-
-(define (inc n)
-  (+ n 1))
-
-;;; tagged lists
-(define (tagged-list? len-xs tag xs)
-  (and (list? xs)
-       (= len-xs (length xs))
-       (eq? (first xs) tag)))
-
-;;; ordered elements
-(define (make-elem pri val)
-  (cons pri val))
-
-(define (elem-priority x)
-  (car x))
-
-(define (elem-val x)
-  (cdr x))
-
-;;; leftist heaps (after Okasaki)
-
-;; data representation
-(define leaf 'leaf)
-
-(define (leaf? h) (eq? 'leaf h))
-
-(define (hnode? h)
-  (and (tagged-list? 5 'hnode h)
-       (natural? (caddr h))))
-
-(define (make-hnode elem heap-a heap-b)
-  (if (< (rank heap-a) (rank heap-b))
-      (list 'hnode elem (+ (rank heap-a) 1) heap-b heap-a)
-      (list 'hnode elem (+ (rank heap-b) 1) heap-a heap-b)))
-
-(define (hnode-elem h)
-  (second h))
-
-(define (hnode-left h)
-  (fourth h))
-
-(define (hnode-right h)
-  (fifth h))
-
-(define (hnode-rank h)
-  (third h))
-
-(define (hord? p h)
-  (or (leaf? h)
-      (<= p (elem-priority (hnode-elem h)))))
-
-(define (heap? h)
-  (or (leaf? h)
-      (and (hnode? h)
-           (heap? (hnode-left h))
-           (heap? (hnode-right h))
-           (<= (rank (hnode-right h))
-               (rank (hnode-left h)))
-           (= (rank h) (inc (rank (hnode-right h))))
-           (hord? (elem-priority (hnode-elem h))
-                  (hnode-left h))
-           (hord? (elem-priority (hnode-elem h))
-                  (hnode-right h)))))
-
-(define (rank h)
-  (if (leaf? h)
-      0
-      (hnode-rank h)))
-
-;; operations
-
-(define empty-heap leaf)
-
-(define (heap-empty? h)
-  (leaf? h))
-
-(define (heap-insert elt heap)
-  (heap-merge heap (make-hnode elt leaf leaf)))
-
-(define (heap-min heap)
-  (hnode-elem heap))
-
-(define (heap-pop heap)
-  (heap-merge (hnode-left heap) (hnode-right heap)))
-
-(define (heap-merge h1 h2)
-  (cond
-   [(leaf? h1) h2]
-   [(leaf? h2) h1]
-   [else (let ((h1-min (heap-min h1))
-                (h2-min (heap-min h2)))
-            (if (< (elem-priority h1-min) (elem-priority h2-min))
-                (make-hnode h1-min (heap-merge (hnode-left h1) (hnode-right h1)) h2)
-                (make-hnode h2-min h1 (heap-merge (hnode-left h2) (hnode-right h2)))))]))
-
-;;; check that a list is sorted (useful for longish lists)
-(define (sorted? xs)
-  (cond [(null? xs)              true]
-        [(null? (cdr xs))        true]
-        [(<= (car xs) (cadr xs)) (sorted? (cdr xs))]
-        [else                    false]))