結果

問題 No.3156 Count That Day's N
コンテスト
ユーザー norioc
提出日時 2025-06-25 02:34:06
言語 Scheme
(Gauche-0.9.15)
結果
AC  
実行時間 855 ms / 3,000 ms
コード長 2,466 bytes
コンパイル時間 330 ms
コンパイル使用メモリ 8,232 KB
実行使用メモリ 30,136 KB
最終ジャッジ日時 2025-06-25 02:34:29
合計ジャッジ時間 22,679 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge3
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ファイルパターン 結果
sample AC * 4
other AC * 32
権限があれば一括ダウンロードができます

ソースコード

diff # 

(use scheme.list)
(use util.match)
(use srfi.13)  ; string
(use srfi.42)  ; list-ec
(use srfi.197) ; chain
(use gauche.collection)
(use gauche.generator)

(define input read-line)

(define (ii)
  (string->number (read-line)))

(define (li)
  (let ((s (read-line)))
    (map string->number (string-split s " "))))

(define (prn . args)
  (for-each (lambda (i x)
              (when (> i 0)
                (display " "))
              (display x))
            (iota (length args))
            args)
  (newline))

(define int string->number)

(define-method min ((xs <sequence>))
  (apply min xs))
(define-method max ((xs <sequence>))
  (apply max xs))

(define (minmax . xs)
  (values->list (apply min&max xs)))
(define-method minmax ((xs <sequence>))
  (values->list (apply min&max xs)))

(define (sum xs) (apply + xs))

(define (divmod a b)
  (values->list (div-and-mod a b)))

(define (1+ n) (+ n 1))
(define (1- n) (- n 1))
(define (!= a b) (not (= a b)))

(define pow
  (case-lambda
   ((a b) (expt a b))
   ((a b m) (expt-mod a b m))))

(define-method frequencies ((xs <sequence>))
  (rlet1 ht (make-hash-table)
    (for-each (^x (hash-table-update! ht x 1+ 0))
              xs)))

(define (yn b)
  (prn (if b "Yes" "No")))

(define-macro (input! bindings . body)
  (let loop ((bs (reverse bindings))
             (res '()))
    (if (null? bs)
        `(let*-values ,res
           ,@body)
        (cond
         ((symbol? (car bs))
          (loop (cdr bs)
                (cons `((,(car bs)) (values (ii)))
                      res)))
         ((list? (car bs))
          (loop (cdr bs)
                (cons `(,(car bs) (apply values (li)))
                      res)))
         (else
          'error)))))

#;
(define-macro (clet1 pat expr . body)
  `(receive ,pat (apply values ,expr)
     ,@body))

(define mlet1 match-let1)

(input! ((K N))
  (let ((x6-list (list-ec (:while (: i 1 N) (<= (pow i 6) N))
                          (pow i 6)))
        (x4-list (list-ec (:while (: i 1 N) (<= (pow i 4) N))
                          (pow i 4))))
    (let ((ht (make-hash-table)))
      (dolist (x6 x6-list)
        (dolist (x4 x4-list)
          (when (<= (+ x6 x4) N)
            (let ((x (+ x6 x4)))
              (mlet1 (d m) (divmod x K)
                (when (= m 0)
                  (let ((z (exact-integer-sqrt d)))
                    (when (= d (* z z))
                      (hash-table-put! ht x #t)))))))))
      (prn (hash-table-size ht)))))
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