23 files changed, 0 insertions, 1236 deletions
diff --git a/advent-of-code/2023/.gitignore b/advent-of-code/2023/.gitignore
deleted file mode 100644
index 770eab4..0000000
--- a/advent-of-code/2023/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-input
-\ No newline at end of file
diff --git a/advent-of-code/2023/01/1.rkt b/advent-of-code/2023/01/1.rkt
deleted file mode 100644
index 8953e84..0000000
--- a/advent-of-code/2023/01/1.rkt
+++ /dev/null
@@ -1,16 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-
-(define fp (open-input-file "input"))
-
-(define lines (get-lines fp))
-
-(define (extract-number line)
-  (define number-list (filter char-numeric? (string->list line)))
-  (set! number-list (map (λ (c)
-                           (string->number (list->string (list c))))
-                         number-list))
-  (+ (last number-list) (* 10 (car number-list))))
-
-(apply + (map extract-number lines))
diff --git a/advent-of-code/2023/01/2.rkt b/advent-of-code/2023/01/2.rkt
deleted file mode 100644
index f39d87c..0000000
--- a/advent-of-code/2023/01/2.rkt
+++ /dev/null
@@ -1,30 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-
-(define fp (open-input-file "input"))
-
-(define lines (get-lines fp))
-
-(define (replace-digit str)
-  (set! str (string-replace str "one" "o1ne"))
-  (set! str (string-replace str "two" "t2wo"))
-  (set! str (string-replace str "three" "t3hree"))
-  (set! str (string-replace str "four" "f4our"))
-  (set! str (string-replace str "five" "f5ive"))
-  (set! str (string-replace str "six" "s6ix"))
-  (set! str (string-replace str "seven" "s7even"))
-  (set! str (string-replace str "eight" "e8ight"))
-  (set! str (string-replace str "nine" "n9ine"))
-  str)
-
-(define (extract-number rawline)
-  (define line (replace-digit rawline))
-  (define number-list (filter char-numeric? (string->list line)))
-  (set! number-list (map (λ (c)
-                           (string->number (list->string (list c))))
-                         number-list))
-  (+ (last number-list) (* 10 (car number-list))))
-
-(display (apply + (map extract-number lines)))
-(newline)
diff --git a/advent-of-code/2023/02/1.rkt b/advent-of-code/2023/02/1.rkt
deleted file mode 100644
index 500e916..0000000
--- a/advent-of-code/2023/02/1.rkt
+++ /dev/null
@@ -1,52 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-
-(define fp (open-input-file "input"))
-
-(define lines (get-lines fp))
-
-(define (extract-game line)
-  (define game-str (cadr (string-split line ":")))
-  (define sets-str (string-split game-str ";"))
-  (set! sets-str (map string-trim sets-str))
-  (map extract-set sets-str))
-
-(define (extract-set str)
-  (define r 0)
-  (define g 0)
-  (define b 0)
-  (define balls (string-split str ","))
-  (set! balls
-        (map (λ (s)
-               (define pair (map string-trim (string-split s " ")))
-               (list (string->number (car pair)) (cadr pair)))
-             balls))
-  (let loop ((balls balls))
-    (if (null? balls)
-        '()
-        (let ()
-          (define ball (car balls))
-          (define number (car ball))
-          (define color (cadr ball))
-          (cond ((string=? "red" color) (set! r number))
-                ((string=? "green" color) (set! g number))
-                ((string=? "blue" color) (set! b number)))
-          (loop (cdr balls)))))
-  (list r g b))
-
-(define (possible? game)
-  (if (null? game)
-      #t
-      (let ()
-        (define head (car game))
-        (if (or (> (car head) 12)    ; r
-                (> (cadr head) 13)   ; g
-                (> (caddr head) 14)) ; b
-            #f
-            (possible? (cdr game))))))
-
-(apply + (map cadr
-              (filter (λ (game)
-                        (possible? (car game)))
-                      (enumerate (map extract-game lines)))))
diff --git a/advent-of-code/2023/02/2.rkt b/advent-of-code/2023/02/2.rkt
deleted file mode 100644
index 7da2cd2..0000000
--- a/advent-of-code/2023/02/2.rkt
+++ /dev/null
@@ -1,44 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-
-(define fp (open-input-file "input"))
-
-(define lines (get-lines fp))
-
-(define (extract-game line)
-  (define game-str (cadr (string-split line ":")))
-  (define sets-str (string-split game-str ";"))
-  (set! sets-str (map string-trim sets-str))
-  (map extract-set sets-str))
-
-(define (extract-set str)
-  (define r 0)
-  (define g 0)
-  (define b 0)
-  (define balls (string-split str ","))
-  (set! balls
-        (map (λ (s)
-               (define pair (map string-trim (string-split s " ")))
-               (list (string->number (car pair)) (cadr pair)))
-             balls))
-  (let loop ((balls balls))
-    (if (null? balls)
-        '()
-        (let ()
-          (define ball (car balls))
-          (define number (car ball))
-          (define color (cadr ball))
-          (cond ((string=? "red" color) (set! r number))
-                ((string=? "green" color) (set! g number))
-                ((string=? "blue" color) (set! b number)))
-          (loop (cdr balls)))))
-  (list r g b))
-
-(define (power game)
-  (define rs (map car game))
-  (define gs (map cadr game))
-  (define bs (map caddr game))
-  (* (apply max rs) (apply max gs) (apply max bs)))
-
-(apply + (map power (map extract-game lines)))
diff --git a/advent-of-code/2023/03/1.rkt b/advent-of-code/2023/03/1.rkt
deleted file mode 100644
index 5e86227..0000000
--- a/advent-of-code/2023/03/1.rkt
+++ /dev/null
@@ -1,84 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-(require "../../lib/obj.rkt")
-
-(define (read-input)
-  (call-with-input-file "input"
-    (λ (fp)
-      (list->vector (get-lines fp)))))
-
-(define schema (read-input))
-
-(define (char-at line col)
-  (string-ref (vector-ref schema line) col))
-
-(define height (vector-length schema))
-(define width (string-length (vector-ref schema 0)))
-
-(define make-num (obj-maker 'line 'col 'value 'length))
-
-(define (scan-nums)
-  (define nums '())
-  (let loop ((i 0))
-    (if (>= i height)
-        (void)
-        (let ()
-          (let loop ((j 0))
-            (define curline (vector-ref schema i))
-            (if (>= j width)
-                (void)
-                (let ()
-                  (define next 1)
-                  (define (find-next)
-                    (if (or (>= (+ j next) 140)
-                            (not (char-numeric? (char-at i (+ j next)))))
-                        (void)
-                        (let ()
-                          (set! next (+ 1 next))
-                          (find-next))))
-                  (if (char-numeric? (char-at i j))
-                      (let ()
-                        (find-next)
-                        (define value (string->number (substring curline j (+ j next))))
-                        (set! nums (cons (make-num i j value next) nums)))
-                      (void))
-                  (loop (+ j next)))))
-          (loop (+ 1 i)))))
-  (reverse nums))
-(define nums (scan-nums))
-
-(define (is-symbol? c)
-  (and (not (char-numeric? c))
-       (not (char=? #\. c))))
-
-(define (collect-adjacent num)
-  (define left
-    (if (= 0 (num 'col))
-        '()
-        (list (char-at (num 'line) (- (num 'col) 1)))))
-  (define right
-    (if (= width (+ (num 'col) (num 'length)))
-        '()
-        (list (char-at (num 'line) (+ (num 'col) (num 'length))))))
-  (define up
-    (if (= 0 (num 'line))
-        '()
-        (string->list
-         (substring (vector-ref schema (- (num 'line) 1))
-                    (max 0 (- (num 'col) 1))
-                    (min width (+ (num 'col) (num 'length) 1))))))
-  (define down
-    (if (= (- height 1) (num 'line))
-        '()
-        (string->list
-         (substring (vector-ref schema (+ (num 'line) 1))
-                    (max 0 (- (num 'col) 1))
-                    (min width (+ (num 'col) (num 'length) 1))))))
-  (append left right up down))
-
-(define (is-part-num? num)
-  (findf is-symbol? (collect-adjacent num)))
-
-(apply + (map (λ (x) (x 'value))
-              (filter is-part-num? nums)))
-\ No newline at end of file
diff --git a/advent-of-code/2023/03/2.rkt b/advent-of-code/2023/03/2.rkt
deleted file mode 100644
index 71c3221..0000000
--- a/advent-of-code/2023/03/2.rkt
+++ /dev/null
@@ -1,102 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-(require "../../lib/obj.rkt")
-
-(define (read-input)
-  (call-with-input-file "input"
-    (λ (fp)
-      (list->vector (get-lines fp)))))
-
-(define schema (read-input))
-
-(define (char-at line col)
-  (string-ref (vector-ref schema line) col))
-
-(define height (vector-length schema))
-(define width (string-length (vector-ref schema 0)))
-
-(define make-num (obj-maker 'line 'col 'value 'length))
-
-(define (scan-nums)
-  (define nums '())
-  (let loop ((i 0))
-    (if (>= i height)
-        (void)
-        (let ()
-          (let loop ((j 0))
-            (define curline (vector-ref schema i))
-            (if (>= j width)
-                (void)
-                (let ()
-                  (define next 1)
-                  (define (find-next)
-                    (if (or (>= (+ j next) 140)
-                            (not (char-numeric? (char-at i (+ j next)))))
-                        (void)
-                        (let ()
-                          (set! next (+ 1 next))
-                          (find-next))))
-                  (if (char-numeric? (char-at i j))
-                      (let ()
-                        (find-next)
-                        (define value (string->number (substring curline j (+ j next))))
-                        (set! nums (cons (make-num i j value next) nums)))
-                      (void))
-                  (loop (+ j next)))))
-          (loop (+ 1 i)))))
-  (reverse nums))
-(define nums (scan-nums))
-
-(define (collect-adjacent-positions num)
-  (define (position-range line start end)
-    (define delta (- end start))
-    (map list (repeat delta line) (range start end)))
-  (define left
-    (if (= 0 (num 'col))
-        '()
-        (list (list (num 'line) (- (num 'col) 1)))))
-  (define right
-    (if (= width (+ (num 'col) (num 'length)))
-        '()
-        (list (list (num 'line) (+ (num 'col) (num 'length))))))
-  (define up
-    (if (= 0 (num 'line))
-        '()
-        (position-range (- (num 'line) 1)
-                        (max 0 (- (num 'col) 1))
-                        (min width (+ (num 'col) (num 'length) 1)))))
-  (define down
-    (if (= (- height 1) (num 'line))
-        '()
-        (position-range (+ (num 'line) 1)
-                        (max 0 (- (num 'col) 1))
-                        (min width (+ (num 'col) (num 'length) 1)))))
-  (append left right up down))
-
-(define asterisks (make-hash))
-
-(define (mark-adj-asterisk num)
-  (define adjs (collect-adjacent-positions num))
-  (define (mark coord)
-    (if (not (char=? #\* (char-at (car coord) (cadr coord))))
-        (void)
-        (let ()
-          (when (not (hash-has-key? asterisks coord))
-            (hash-set! asterisks coord '()))
-          (hash-set! asterisks coord (cons (num 'value) (hash-ref asterisks coord))))))
-  (for-each mark adjs))
-
-(for-each mark-adj-asterisk nums)
-
-(define aster-list (hash->list asterisks))
-
-(define (is-gear? aster)
-  (define nums-list (cdr aster))
-  (= 2 (length nums-list)))
-
-(define (power aster)
-  (define nums-list (cdr aster))
-  (* (car nums-list) (cadr nums-list)))
-
-(apply + (map power (filter is-gear? aster-list)))
diff --git a/advent-of-code/2023/04/1.rkt b/advent-of-code/2023/04/1.rkt
deleted file mode 100644
index e8dd242..0000000
--- a/advent-of-code/2023/04/1.rkt
+++ /dev/null
@@ -1,29 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-(require "../../lib/obj.rkt")
-
-(define fp (open-input-file "input"))
-
-(define lines (get-lines fp))
-
-(define (strip-head s)
-  (string-trim (cadr (string-split s ":"))))
-
-(set! lines (map strip-head lines))
-
-(define make-card (obj-maker 'win-nums 'nums))
-
-(define (parse-card s)
-  (define lst (string-split s "|"))
-  (define win-nums (map string->number (string-split (car lst))))
-  (define nums (map string->number (string-split (cadr lst))))
-  (make-card win-nums nums))
-
-(define (point card)
-  (define wins (length (filter (λ (x) (member x (card 'win-nums))) (card 'nums))))
-  (if (= wins 0)
-      0
-      (expt 2 (- wins 1))))
-
-(apply + (map point (map parse-card lines)))
diff --git a/advent-of-code/2023/04/2.rkt b/advent-of-code/2023/04/2.rkt
deleted file mode 100644
index eec9632..0000000
--- a/advent-of-code/2023/04/2.rkt
+++ /dev/null
@@ -1,47 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-(require "../../lib/obj.rkt")
-
-(define fp (open-input-file "input"))
-
-(define lines (get-lines fp))
-
-(define (strip-head s)
-  (string-trim (cadr (string-split s ":"))))
-
-(set! lines (map strip-head lines))
-
-(define make-card (obj-maker 'win-nums 'nums))
-
-(define (parse-card s)
-  (define lst (string-split s "|"))
-  (define win-nums (map string->number (string-split (car lst))))
-  (define nums (map string->number (string-split (cadr lst))))
-  (make-card win-nums nums))
-
-(define cards (map parse-card lines))
-
-(define card-count (make-vector (length cards) 1))
-
-(define (win-count card)
-  (length (filter (λ (x) (member x (card 'win-nums))) (card 'nums))))
-
-(define card-vec (list->vector cards))
-
-(let loop ((i 0))
-  (if (>= i (vector-length card-count))
-      (void)
-      (let ()
-        (define win-cnt (win-count (vector-ref card-vec i)))
-        (let loop ((j (+ i 1)))
-          (if (or (>= j (vector-length card-count))
-                  (>= j (+ 1 i win-cnt)))
-              (void)
-              (let ()
-                (vector-set! card-count j (+ (vector-ref card-count i)
-                                             (vector-ref card-count j)))
-                (loop (+ 1 j)))))
-        (loop (+ 1 i)))))
-
-(apply + (vector->list card-count))
-\ No newline at end of file
diff --git a/advent-of-code/2023/05/1.rkt b/advent-of-code/2023/05/1.rkt
deleted file mode 100755
index 352e10c..0000000
--- a/advent-of-code/2023/05/1.rkt
+++ /dev/null
@@ -1,71 +0,0 @@
-#lang racket
-
-(define port (open-input-file "input"))
-
-(define seed
-  (let ()
-    (define nums-str
-      (string-trim
-       (list-ref (string-split (read-line port) ":") 1)))
-    (map string->number (string-split nums-str " "))))
-
-(begin (read-line port) (void))
-
-(define (read-line-convert-eof port)
-  (define line (read-line port))
-  (if (eof-object? line) "" line))
-
-(define (read-map)
-  (define (loop ret)
-    (define line (string-trim (read-line-convert-eof port)))
-    (if (= 0 (string-length line))
-        (reverse ret)
-        (loop (cons (map string->number (string-split line " "))
-                    ret))))
-  (read-line port)
-  (loop '()))
-
-(define s2s (read-map))
-(define s2f (read-map))
-(define f2w (read-map))
-(define w2l (read-map))
-(define l2t (read-map))
-(define t2h (read-map))
-(define h2l (read-map))
-(define maps (list s2s s2f f2w w2l l2t t2h h2l))
-
-(define (gen-mapper the-map)
-  (define (mapper x)
-    (define (loop the-map)
-      (if (null? the-map)
-          x
-          (let ()
-            (define cur-map (car the-map))
-            (define target (car cur-map))
-            (define start (cadr cur-map))
-            (define len (caddr cur-map))
-            (if (and (>= x start)
-                     (<= x (+ start len)))
-                (+ target (- x start))
-                (loop (cdr the-map))))))
-    (loop the-map))
-  mapper)
-
-(define mappers (map gen-mapper maps))
-
-
-(define (comp-func funcs)
-  (define procs (reverse funcs))
-  (define (comp-rec arg)
-    (if (null? procs)
-        arg
-        (let ((proc (car procs))
-              (rest (cdr procs)))
-          (set! procs rest)
-          (proc (comp-rec arg)))))
-  comp-rec)
-
-(define (find-location x)
-  ((comp-func mappers) x))
-
-(display (apply min (map find-location seed)))
diff --git a/advent-of-code/2023/05/2.rkt b/advent-of-code/2023/05/2.rkt
deleted file mode 100755
index 8e39c40..0000000
--- a/advent-of-code/2023/05/2.rkt
+++ /dev/null
@@ -1,109 +0,0 @@
-#lang racket
-
-(define port (open-input-file "input"))
-
-(define seed
-  (let ()
-    (define nums-str
-      (string-trim
-       (list-ref (string-split (read-line port) ":") 1)))
-    (define (pairing l)
-      (define (loop ret l)
-        (if (null? l)
-            ret
-            (loop
-             (cons (cons
-                    (car l)
-                    (+ (car l) (cadr l)))
-                   ret)
-             (cddr l))))
-      (loop '() l))
-    (reverse
-     (pairing (map string->number (string-split nums-str " "))))))
-
-(begin (read-line port) (void))
-
-(define (read-line-convert-eof port)
-  (define line (read-line port))
-  (if (eof-object? line) "" line))
-
-(define (read-map)
-  (define (loop ret)
-    (define line (string-trim (read-line-convert-eof port)))
-    (if (= 0 (string-length line))
-        (sort (reverse ret) (λ (x y) (< (cadr x) (cadr y))))
-        (loop (cons (map string->number (string-split line " "))
-                    ret))))
-  (read-line port)
-  (loop '()))
-
-(define s2s (read-map))
-(define s2f (read-map))
-(define f2w (read-map))
-(define w2l (read-map))
-(define l2t (read-map))
-(define t2h (read-map))
-(define h2l (read-map))
-(define maps (list s2s s2f f2w w2l l2t t2h h2l))
-
-(define (range-map mlist r)
-  ;; r :: Range :: (start . end)
-  ;; mlist :: List of (Map :: (dest, src, len))
-  (define (loop result mlist r)
-    (define start (car r))
-    (define end (cdr r))
-    (if (null? mlist)
-        (cons r result)
-        (let ()
-          (define cur-map (car mlist))
-          (define map-target (car cur-map))
-          (define map-start (cadr cur-map))
-          (define map-end (+ map-start (caddr cur-map)))
-          (define offset (- map-target map-start))
-          (define (pair-offset p) (cons (+ offset (car p)) (+ offset (cdr p))))
-          (cond ((<= end start)
-                 result)
-                ((>= start map-end)
-                 (loop result (cdr mlist) r))
-                ((>= start map-start)
-                 (loop
-                  (cons (pair-offset (cons start (min end map-end)))
-                        result)
-                  (cdr mlist)
-                  (cons (min end map-end) end)))
-                ((<= end map-start)
-                 (cons r result))
-                ((< start map-start)
-                 (loop
-                  (cons (cons start map-start) result)
-                  mlist
-                  (cons map-start end)))
-                (else (error "unhandled cond in range-map"))))))
-  (reverse (loop '() mlist r)))
-
-(define (gen-range-mapper the-map)
-  (define (mapper range-list)
-    (apply append
-           (map
-            (λ (range)
-              (range-map the-map range))
-            range-list)))
-  mapper)
-
-(define mappers (map gen-range-mapper maps))
-
-(define (comp-func funcs)
-  (define procs (reverse funcs))
-  (define (comp-rec arg)
-    (if (null? procs)
-        arg
-        (let ((proc (car procs))
-              (rest (cdr procs)))
-          (set! procs rest)
-          (proc (comp-rec arg)))))
-  comp-rec)
-
-(define (find-location x)
-  ((comp-func mappers) x))
-
-(display (apply min (map car (find-location seed))))
diff --git a/advent-of-code/2023/06/1.rkt b/advent-of-code/2023/06/1.rkt
deleted file mode 100644
index 5496476..0000000
--- a/advent-of-code/2023/06/1.rkt
+++ /dev/null
@@ -1,32 +0,0 @@
-#lang racket
-
-(define in (open-input-file "input"))
-
-(define (read-num-list)
-  (define line (read-line in))
-  (map
-   string->number
-   (string-split
-    (cadr (string-split (string-trim line) ":")))))
-
-(define times (read-num-list))
-(define distances (read-num-list))
-
-(define games (map cons times distances))
-
-(define (calc time hold-time)
-  (* hold-time (- time hold-time)))
-
-(define (solve time distance)
-  (define (loop counter hold-time)
-    (if (> hold-time time)
-        counter
-        (if (> (calc time hold-time) distance)
-            (loop (+ 1 counter) (+ 1 hold-time))
-            (loop counter (+ 1 hold-time)))))
-  (loop 0 0))
-
-(display (apply * (map
-                   (λ (x) (solve (car x) (cdr x)))
-                   games)))
-(newline)
diff --git a/advent-of-code/2023/06/2.rkt b/advent-of-code/2023/06/2.rkt
deleted file mode 100644
index 2d666ed..0000000
--- a/advent-of-code/2023/06/2.rkt
+++ /dev/null
@@ -1,29 +0,0 @@
-#lang racket
-
-(define in (open-input-file "input"))
-
-(define (read-num)
-  (define line (read-line in))
-  (string->number
-   (apply
-    string-append
-    (string-split
-     (cadr (string-split (string-trim line) ":"))))))
-
-(define time (read-num))
-(define distance (read-num))
-
-(define (calc time hold-time)
-  (* hold-time (- time hold-time)))
-
-(define (solve time distance)
-  (define (loop counter hold-time)
-    (if (> hold-time time)
-        counter
-        (if (> (calc time hold-time) distance)
-            (loop (+ 1 counter) (+ 1 hold-time))
-            (loop counter (+ 1 hold-time)))))
-  (loop 0 0))
-
-(display (solve time distance))
-(newline)
diff --git a/advent-of-code/2023/07/1.rkt b/advent-of-code/2023/07/1.rkt
deleted file mode 100644
index 286a0e8..0000000
--- a/advent-of-code/2023/07/1.rkt
+++ /dev/null
@@ -1,80 +0,0 @@
-#lang racket
-
-(define input
-  (with-input-from-file "input"
-    (λ ()
-      (let loop ((cards '()))
-        (define line (read-line))
-        (if (or (eof-object? line)
-                (= 0 (string-length line)))
-            (reverse cards)
-            (let ()
-              (define splited-line (string-split line))
-              (define hand (car splited-line))
-              (define bid (string->number (cadr splited-line)))
-              (loop (cons (list hand bid) cards))))))))
-
-(define (card-number char)
-  (cond ((eq? char #\A) 12)
-        ((eq? char #\K) 11)
-        ((eq? char #\Q) 10)
-        ((eq? char #\J) 9)
-        ((eq? char #\T) 8)
-        (else (- (string->number (make-string 1 char))
-                 2))))
-
-(define (hand-type hand)
-  (define vec (make-vector 13 0))
-  (let loop ((i 0))
-    (if (>= i 5)
-        (vector->list (vector-sort vec >))
-        (let ()
-          (define index (card-number (string-ref hand i)))
-          (vector-set! vec index (+ 1 (vector-ref vec index)))
-          (loop (+ i 1))))))
-
-(define (hand-type<? type1 type2)
-  (if (or (null? type1)
-          (null? type2))
-      #f
-      (if (= (car type1) (car type2))
-          (hand-type<? (cdr type1) (cdr type2))
-          (< (car type1) (car type2)))))
-
-(define (hand-type=? type1 type2)
-  (if (null? type1)
-      #t
-      (if (= (car type1) (car type2))
-          (hand-type=? (cdr type1) (cdr type2))
-          #f)))
-
-(define (raw-hand<? hand1 hand2)
-  (define h1 (map card-number (string->list hand1)))
-  (define h2 (map card-number (string->list hand2)))
-  (hand-type<? h1 h2))
-
-(define (hand<? hand1 hand2)
-  (define type1 (hand-type hand1))
-  (define type2 (hand-type hand2))
-  (if (hand-type=? type1 type2)
-      (raw-hand<? hand1 hand2)
-      (hand-type<? type1 type2)))
-
-(define sorted-cards
-  (sort input (λ (a b)
-                (hand<? (car a) (car b)))))
-
-(define (calc-points card)
-  (* (cadar card) (cadr card)))
-
-(define (enumerate lst)
-  (let loop ((i 1) (ret '()) (remain lst))
-    (if (null? remain)
-        (reverse ret)
-        (loop (+ 1 i) (cons (list (car remain) i) ret) (cdr remain)))))
-
-(define result
-  (apply + (map calc-points (enumerate sorted-cards))))
-
-(display result)
-(newline)
diff --git a/advent-of-code/2023/07/2.rkt b/advent-of-code/2023/07/2.rkt
deleted file mode 100644
index 07ff61b..0000000
--- a/advent-of-code/2023/07/2.rkt
+++ /dev/null
@@ -1,87 +0,0 @@
-#lang racket
-
-(define input
-  (with-input-from-file "input"
-    (λ ()
-      (let loop ((cards '()))
-        (define line (read-line))
-        (if (or (eof-object? line)
-                (= 0 (string-length line)))
-            (reverse cards)
-            (let ()
-              (define splited-line (string-split line))
-              (define hand (car splited-line))
-              (define bid (string->number (cadr splited-line)))
-              (loop (cons (list hand bid) cards))))))))
-
-(define (card-number char)
-  (cond ((eq? char #\A) 12)
-        ((eq? char #\K) 11)
-        ((eq? char #\Q) 10)
-        ((eq? char #\J) 0)
-        ((eq? char #\T) 9)
-        (else (- (string->number (make-string 1 char))
-                 1))))
-
-(define (joker-transform type)
-  (define joker-num (vector-ref type 0))
-  (vector-set! type 0 0)
-  (vector-sort! type >)
-  (vector-set! type 0 (+ joker-num (vector-ref type 0)))
-  type)
-
-(define (hand-type hand)
-  (define vec (make-vector 13 0))
-  (let loop ((i 0))
-    (if (>= i 5)
-        (vector->list (joker-transform vec))
-        (let ()
-          (define index (card-number (string-ref hand i)))
-          (vector-set! vec index (+ 1 (vector-ref vec index)))
-          (loop (+ i 1))))))
-
-(define (hand-type<? type1 type2)
-  (if (or (null? type1)
-          (null? type2))
-      #f
-      (if (= (car type1) (car type2))
-          (hand-type<? (cdr type1) (cdr type2))
-          (< (car type1) (car type2)))))
-
-(define (hand-type=? type1 type2)
-  (if (null? type1)
-      #t
-      (if (= (car type1) (car type2))
-          (hand-type=? (cdr type1) (cdr type2))
-          #f)))
-
-(define (raw-hand<? hand1 hand2)
-  (define h1 (map card-number (string->list hand1)))
-  (define h2 (map card-number (string->list hand2)))
-  (hand-type<? h1 h2))
-
-(define (hand<? hand1 hand2)
-  (define type1 (hand-type hand1))
-  (define type2 (hand-type hand2))
-  (if (hand-type=? type1 type2)
-      (raw-hand<? hand1 hand2)
-      (hand-type<? type1 type2)))
-
-(define sorted-cards
-  (sort input (λ (a b)
-                (hand<? (car a) (car b)))))
-
-(define (calc-points card)
-  (* (cadar card) (cadr card)))
-
-(define (enumerate lst)
-  (let loop ((i 1) (ret '()) (remain lst))
-    (if (null? remain)
-        (reverse ret)
-        (loop (+ 1 i) (cons (list (car remain) i) ret) (cdr remain)))))
-
-(define result
-  (apply + (map calc-points (enumerate sorted-cards))))
-
-(display result)
-(newline)
diff --git a/advent-of-code/2023/08/1.rkt b/advent-of-code/2023/08/1.rkt
deleted file mode 100644
index 81424a1..0000000
--- a/advent-of-code/2023/08/1.rkt
+++ /dev/null
@@ -1,47 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-
-(define lines
-  (call-with-input-file "input"
-    (lambda (fp)
-      (get-lines fp))))
-
-(define instructions (string->list (car lines)))
-
-(define (make-instruction-generator)
-  (define cur instructions)
-  (lambda ()
-    (when (null? cur)
-      (set! cur instructions))
-    (define ret (car cur))
-    (set! cur (cdr cur))
-    ret))
-
-(define next-instruction (make-instruction-generator))
-
-(set! lines (cddr lines))
-
-(define (parse-map str)
-  (define p1 (string-split str "="))
-  (define key (string-trim (car p1)))
-  (define val-str (string-trim (cadr p1)))
-  (define value (list (substring val-str 1 4) (substring val-str 6 9)))
-  (cons key value))
-
-(define the-map (make-hash (map parse-map lines)))
-
-(define (simulate start end)
-  (let loop ((i 0) (cur start))
-    (if (string=? cur end)
-        i
-        (let ()
-          (define instruction (next-instruction))
-          (define mapping (hash-ref the-map cur))
-          (define next
-            (if (char=? instruction #\L)
-                (car mapping)
-                (cadr mapping)))
-          (loop (+ 1 i) next)))))
-
-(simulate "AAA" "ZZZ")
-\ No newline at end of file
diff --git a/advent-of-code/2023/08/2.rkt b/advent-of-code/2023/08/2.rkt
deleted file mode 100644
index c0c55ea..0000000
--- a/advent-of-code/2023/08/2.rkt
+++ /dev/null
@@ -1,60 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-
-(define lines
-  (call-with-input-file "input"
-    (lambda (fp)
-      (get-lines fp))))
-
-(define instructions (string->list (car lines)))
-
-(define (make-instruction-generator)
-  (define cur instructions)
-  (lambda ()
-    (when (null? cur)
-      (set! cur instructions))
-    (define ret (car cur))
-    (set! cur (cdr cur))
-    ret))
-
-(define next-instruction (make-instruction-generator))
-
-(set! lines (cddr lines))
-
-(define (parse-map str)
-  (define p1 (string-split str "="))
-  (define key (string-trim (car p1)))
-  (define val-str (string-trim (cadr p1)))
-  (define value (list (substring val-str 1 4) (substring val-str 6 9)))
-  (cons key value))
-
-(define the-map (make-hash (map parse-map lines)))
-
-(define (is-start? str)
-  (char=? #\A (string-ref str 2)))
-
-(define (is-end? str)
-  (char=? #\Z (string-ref str 2)))
-
-(define (simulate start)
-  (let loop ((i 0) (cur start))
-    (if (is-end? cur)
-        i
-        (let ()
-          (define instruction (next-instruction))
-          (define (next-point point)
-            (define mapping (hash-ref the-map point))
-            (if (char=? instruction #\L)
-                (car mapping)
-                (cadr mapping)))
-          (loop (+ 1 i) (next-point cur))))))
-
-
-(define starts
-  (let ()
-    (define lst (hash->list the-map))
-    (define keys (map car lst))
-    (filter is-start? keys)))
-
-(apply lcm (map simulate starts))
-\ No newline at end of file
diff --git a/advent-of-code/2023/09/1.rkt b/advent-of-code/2023/09/1.rkt
deleted file mode 100644
index 531c5dd..0000000
--- a/advent-of-code/2023/09/1.rkt
+++ /dev/null
@@ -1,27 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-
-(define lines
-  (call-with-input-file "input"
-    (λ (fp)
-      (get-lines fp))))
-
-(define (parse-data line)
-  (map string->number (string-split line)))
-
-(define data (map parse-data lines))
-
-(define (diff lst)
-  (let loop ((cur lst) (ret '()))
-    (if (or (null? cur) (null? (cdr cur)))
-      (reverse ret)
-      (loop (cdr cur) (cons (- (cadr cur) (car cur)) ret)))))
-
-(define (predict lst)
-  (if (andmap (λ (x) (= x (car lst))) lst)
-    (car lst)
-    (+ (last lst) (predict (diff lst)))))
-
-(apply + (map predict data))
-
diff --git a/advent-of-code/2023/09/2.rkt b/advent-of-code/2023/09/2.rkt
deleted file mode 100644
index b747b97..0000000
--- a/advent-of-code/2023/09/2.rkt
+++ /dev/null
@@ -1,26 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-
-(define lines
-  (call-with-input-file "input"
-    (λ (fp)
-      (get-lines fp))))
-
-(define (parse-data line)
-  (map string->number (string-split line)))
-
-(define data (map parse-data lines))
-
-(define (diff lst)
-  (let loop ((cur lst) (ret '()))
-    (if (or (null? cur) (null? (cdr cur)))
-      (reverse ret)
-      (loop (cdr cur) (cons (- (cadr cur) (car cur)) ret)))))
-
-(define (predict lst)
-  (if (andmap (λ (x) (= x (car lst))) lst)
-    (car lst)
-    (- (car lst) (predict (diff lst)))))
-
-(apply + (map predict data))
diff --git a/advent-of-code/2023/10/1.rkt b/advent-of-code/2023/10/1.rkt
deleted file mode 100644
index e4911aa..0000000
--- a/advent-of-code/2023/10/1.rkt
+++ /dev/null
@@ -1,83 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-
-(define lines
-  (call-with-input-file "input"
-    (λ (fp)
-      (get-lines fp))))
-
-(define diagram (list->vector lines))
-(define height (vector-length diagram))
-(define width (string-length (vector-ref diagram 0)))
-(define (char-at x y)
-  (string-ref (vector-ref diagram y) x))
-
-(define (find-start)
-  (let loop ((x 0) (y 0))
-    (if (>= y height)
-      #f
-      (if (>= x width)
-        (loop 0 (+ y 1))
-        (if (char=? #\S (char-at x y))
-          (cons x y)
-          (loop (+ x 1) y))))))
-
-(define start (find-start))
-
-(define (valid-pos? pos)
-  (define x (car pos))
-  (define y (cdr pos))
-  (and (and (>= x 0) (< x width))
-       (and (>= y 0) (< y height))))
-
-(define first-pos
-  (let ()
-    (define up (cons (car start) (- (cdr start) 1)))
-    (define down (cons (car start) (+ (cdr start) 1)))
-    (define left (cons (- (car start) 1) (cdr start)))
-    (define right (cons (+ (car start) 1) (cdr start)))
-      (cond ((and (valid-pos? up)
-                  (member (char-at (car up) (cdr up)) (list #\| #\F #\7)))
-            up)
-            ((and (valid-pos? down)
-                  (member (char-at (car down) (cdr down)) (list #\| #\L #\J )))
-            down)
-            ((and (valid-pos? left)
-                  (member (char-at (car left) (cdr left)) (list #\- #\F #\L )))
-            left)
-            ((and (valid-pos? right)
-                  (member (char-at (car right) (cdr right)) (list #\- #\7 #\J)))
-            right))))
-
-(define (next cur recent)
-  (define up (cons (car cur) (- (cdr cur) 1)))
-  (define down (cons (car cur) (+ (cdr cur) 1)))
-  (define left (cons (- (car cur) 1) (cdr cur)))
-  (define right (cons (+ (car cur) 1) (cdr cur)))
-  (define c (char-at (car cur) (cdr cur)))
-  (define possible-pos
-    (cond ((char=? c #\|) (list up down))
-          ((char=? c #\-) (list left right))
-          ((char=? c #\F) (list right down))
-          ((char=? c #\L) (list up right))
-          ((char=? c #\7) (list left down))
-          ((char=? c #\J) (list up left))))
-  (let loop ((cur possible-pos))
-    (if (not (equal? (car cur) recent))
-      (car cur)
-      (loop (cdr cur)))))
-
-(define (simulate)
-  (let loop ((i 0) (cur first-pos) (recent start))
-    (if (equal? cur start)
-      i
-      (let ()
-        (define next-loc (next cur recent))
-        (loop (+ i 1) next-loc cur)))))
-
-(define loop-length (simulate))
-
-(if (= 0 (modulo loop-length 2))
-  (/ loop-length 2)
-  (+ 1 (quotient loop-length 2)))
diff --git a/advent-of-code/2023/10/2.rkt b/advent-of-code/2023/10/2.rkt
deleted file mode 100644
index 3653a94..0000000
--- a/advent-of-code/2023/10/2.rkt
+++ /dev/null
@@ -1,112 +0,0 @@
-#lang racket
-
-(require "../../lib/utils.rkt")
-
-(define lines
-  (call-with-input-file "input"
-    (λ (fp)
-      (get-lines fp))))
-
-(define diagram (list->vector lines))
-(define height (vector-length diagram))
-(define width (string-length (vector-ref diagram 0)))
-(define (char-at x y)
-  (string-ref (vector-ref diagram y) x))
-
-(define (find-start)
-  (let loop ((x 0) (y 0))
-    (if (>= y height)
-      #f
-      (if (>= x width)
-        (loop 0 (+ y 1))
-        (if (char=? #\S (char-at x y))
-          (cons x y)
-          (loop (+ x 1) y))))))
-
-(define start (find-start))
-
-(define (valid-pos? pos)
-  (define x (car pos))
-  (define y (cdr pos))
-  (and (and (>= x 0) (< x width))
-       (and (>= y 0) (< y height))))
-
-(define first-pos
-  (let ()
-    (define up (cons (car start) (- (cdr start) 1)))
-    (define down (cons (car start) (+ (cdr start) 1)))
-    (define left (cons (- (car start) 1) (cdr start)))
-    (define right (cons (+ (car start) 1) (cdr start)))
-      (cond ((and (valid-pos? up)
-                  (member (char-at (car up) (cdr up)) (list #\| #\F #\7)))
-            up)
-            ((and (valid-pos? down)
-                  (member (char-at (car down) (cdr down)) (list #\| #\L #\J )))
-            down)
-            ((and (valid-pos? left)
-                  (member (char-at (car left) (cdr left)) (list #\- #\F #\L )))
-            left)
-            ((and (valid-pos? right)
-                  (member (char-at (car right) (cdr right)) (list #\- #\7 #\J)))
-            right))))
-
-(define (next cur recent)
-  (define up (cons (car cur) (- (cdr cur) 1)))
-  (define down (cons (car cur) (+ (cdr cur) 1)))
-  (define left (cons (- (car cur) 1) (cdr cur)))
-  (define right (cons (+ (car cur) 1) (cdr cur)))
-  (define c (char-at (car cur) (cdr cur)))
-  (define possible-pos
-    (cond ((char=? c #\|) (list up down))
-          ((char=? c #\-) (list left right))
-          ((char=? c #\F) (list right down))
-          ((char=? c #\L) (list up right))
-          ((char=? c #\7) (list left down))
-          ((char=? c #\J) (list up left))))
-  (let loop ((cur possible-pos))
-    (if (not (equal? (car cur) recent))
-      (car cur)
-      (loop (cdr cur)))))
-
-(define pipes (make-hash))
-
-(define (simulate)
-  (let loop ((i 0) (cur first-pos) (recent start))
-    (hash-set! pipes cur '())
-    (if (equal? cur start)
-      i
-      (let ()
-        (define next-loc (next cur recent))
-        (loop (+ i 1) next-loc cur)))))
-
-(define (mark-junk)
-  (let loop ((x 0) (y 0))
-    (if (>= y height)
-      (void)
-      (if (>= x width)
-        (loop 0 (+ y 1))
-        (let ()
-          (when (and (not (hash-has-key? pipes (cons x y)))
-                     (not (char=? #\. (char-at x y))))
-            (string-set! (vector-ref diagram y) x #\.))
-          (loop (+ 1 x) y))))))
-
-(let ()
-  (simulate)
-  (mark-junk)
-  (void))
-
-(define (ray-cast-find s)
-  (let loop ((i 0) (flag #f) (ret 0))
-    (if (>= i width)
-      ret
-      (let ()
-        (define char (string-ref s i))
-        (if (and flag (char=? char #\.))
-          (loop (+ 1 i) flag (+ 1 ret))
-          (if (member char (list #\| #\F #\7))
-            (loop (+ 1 i) (not flag) ret)
-            (loop (+ 1 i) flag ret)))))))
-
-(apply + (map ray-cast-find (vector->list diagram)))
-
diff --git a/advent-of-code/lib/obj.rkt b/advent-of-code/lib/obj.rkt
deleted file mode 100644
index 8ffc401..0000000
--- a/advent-of-code/lib/obj.rkt
+++ /dev/null
@@ -1,32 +0,0 @@
-#lang racket
-
-(provide obj-maker
-         obj-set
-         obj-show)
-
-(define (alist->obj alist)
-  (λ key
-    (if (null? key)
-        alist
-        (cadr (assoc (car key) alist)))))
-
-(define (obj-maker . fields)
-  (λ inits
-    (define alist (map list fields inits))
-    (alist->obj alist)))
-
-(define (obj-set record key value)
-  (define alist (record))
-  (define new-alist
-    (let loop ((new-list '()) (cur alist) (is-set #f))
-      (if (null? cur)
-          (if is-set
-              new-list
-              (cons (list key value) new-list))
-          (let ()
-            (if (eq? key (caar cur))
-                (loop (cons (list key value) new-list) (cdr cur) #t)
-                (loop (cons (car cur) new-list) (cdr cur) is-set))))))
-  (alist->obj new-alist))
-
-(define (obj-show x) (x))
-\ No newline at end of file
diff --git a/advent-of-code/lib/utils.rkt b/advent-of-code/lib/utils.rkt
deleted file mode 100644
index 2ce8a51..0000000
--- a/advent-of-code/lib/utils.rkt
+++ /dev/null
@@ -1,36 +0,0 @@
-#lang racket
-
-(provide get-lines
-         enumerate
-         repeat
-         split-list-by)
-
-(define (repeat n e)
-  (let loop ((i 0) (ret '()))
-    (if (>= i n)
-        ret
-        (loop (+ 1 i) (cons e ret)))))
-
-(define (get-lines fp)
-  (let loop ((lines '()))
-    (define l (read-line fp))
-    (if (eof-object? l)
-        (reverse lines)
-        (loop (cons l lines)))))
-
-(define (enumerate lst)
-  (let loop ((i 1) (ret '()) (remain lst))
-    (if (null? remain)
-        (reverse ret)
-        (loop (+ 1 i) (cons (list (car remain) i) ret) (cdr remain)))))
-
-(define (split-list-by e lst . eq)
-  (define cmp (if (null? eq) equal? eq))
-  (let loop ((ret '())
-             (cur '())
-             (lst lst))
-    (if (null? lst)
-        (reverse (cons (reverse cur) ret))
-        (if (cmp e (car lst))
-            (loop (cons (reverse cur) ret) '() (cdr lst))
-            (loop ret (cons (car lst) cur) (cdr lst))))))