結果

問題 No.660 家を通り過ぎないランダムウォーク問題
ユーザー Common LispCommon Lisp
提出日時 2024-11-15 15:50:15
言語 Common Lisp
(sbcl 2.3.8)
結果
AC  
実行時間 91 ms / 2,000 ms
コード長 1,853 bytes
コンパイル時間 390 ms
コンパイル使用メモリ 37,520 KB
実行使用メモリ 46,208 KB
最終ジャッジ日時 2024-11-15 15:50:20
合計ジャッジ時間 4,614 ms
ジャッジサーバーID
(参考情報)
judge1 / judge4
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 61 ms
43,060 KB
testcase_01 AC 62 ms
41,536 KB
testcase_02 AC 62 ms
34,048 KB
testcase_03 AC 59 ms
33,792 KB
testcase_04 AC 59 ms
34,048 KB
testcase_05 AC 59 ms
33,792 KB
testcase_06 AC 58 ms
33,920 KB
testcase_07 AC 63 ms
33,920 KB
testcase_08 AC 59 ms
33,920 KB
testcase_09 AC 63 ms
33,920 KB
testcase_10 AC 65 ms
34,048 KB
testcase_11 AC 58 ms
33,792 KB
testcase_12 AC 60 ms
33,792 KB
testcase_13 AC 60 ms
33,920 KB
testcase_14 AC 59 ms
34,048 KB
testcase_15 AC 60 ms
33,792 KB
testcase_16 AC 60 ms
33,920 KB
testcase_17 AC 58 ms
34,048 KB
testcase_18 AC 58 ms
33,920 KB
testcase_19 AC 58 ms
33,792 KB
testcase_20 AC 63 ms
34,048 KB
testcase_21 AC 63 ms
33,920 KB
testcase_22 AC 60 ms
33,792 KB
testcase_23 AC 59 ms
33,792 KB
testcase_24 AC 60 ms
33,920 KB
testcase_25 AC 61 ms
33,792 KB
testcase_26 AC 65 ms
33,792 KB
testcase_27 AC 59 ms
33,792 KB
testcase_28 AC 66 ms
33,664 KB
testcase_29 AC 59 ms
34,048 KB
testcase_30 AC 62 ms
33,920 KB
testcase_31 AC 62 ms
33,920 KB
testcase_32 AC 60 ms
34,176 KB
testcase_33 AC 61 ms
34,304 KB
testcase_34 AC 59 ms
34,304 KB
testcase_35 AC 64 ms
35,712 KB
testcase_36 AC 65 ms
35,840 KB
testcase_37 AC 64 ms
35,840 KB
testcase_38 AC 73 ms
39,168 KB
testcase_39 AC 73 ms
39,296 KB
testcase_40 AC 73 ms
39,424 KB
testcase_41 AC 91 ms
43,264 KB
testcase_42 AC 85 ms
43,264 KB
testcase_43 AC 87 ms
44,928 KB
testcase_44 AC 89 ms
46,208 KB
権限があれば一括ダウンロードができます
コンパイルメッセージ
; compiling file "/home/judge/data/code/Main.lisp" (written 15 NOV 2024 03:50:15 PM):

; wrote /home/judge/data/code/Main.fasl
; compilation finished in 0:00:00.089

ソースコード

diff #

(defconstant +mod+ 1000000007)

(defun %mod-inverse (a_ m_)
  (let ((a a_)
        (m m_)
        (b m_)
        (u 1)
        (v 0))
    (loop while (plusp b) do
          (let ((s (floor a b)))
            (decf a (* s b))
            (rotatef a b)
            (decf u (* s v))
            (rotatef u v)))
    (mod u m)))

(defvar *mod-fact* (make-array 1000001 :element-type 'integer))
(defvar *mod-fact-inv* (make-array 1000001 :element-type 'integer))
(defvar *mod-inv* (make-array 1000001 :element-type 'integer))

(defun %init-mod-combination (n m)
  (setf (aref *mod-fact* 0) 1
        (aref *mod-fact-inv* n) 1
        (aref *mod-inv* 0) 1)
  (loop for i from 1 to n do
        (setf (aref *mod-fact* i) (mod (* i (aref *mod-fact* (1- i))) m)))
  (setf (aref *mod-fact-inv* n) (%mod-inverse (aref *mod-fact* n) m))
  (loop for i from (1- n) downto 0 do
        (setf (aref *mod-fact-inv* i) (mod (* (aref *mod-fact-inv* (1+ i)) (1+ i)) m)))
  (loop for i from 1 to n do
        (setf (aref *mod-inv* i) (mod (* (aref *mod-fact* (1- i)) (aref *mod-fact-inv* i)) m))))

(defun %mod-nCk (n k m)
  (if (or (minusp k) (< n k))
      0
      (mod (* (aref *mod-fact* n) (aref *mod-fact-inv* k) (aref *mod-fact-inv* (- n k))) m)))

(defun %mod-nPk (n k m)
  (if (or (minusp k) (< n k))
      0
      (mod (* (aref *mod-fact* n) (aref *mod-fact-inv* (- n k))) m)))

(defun %mod-nHk (n k m)
  (if (= n k 0)
      1
      (%mod-nCk (+ n k -1) k m)))

(defun main (&rest argv)
  (declare (ignorable argv))
  (%init-mod-combination 500001 +mod+)
  (let* ((n (read))
         (res 0)
         (k 0))
    (loop for i from (1- n) below (* 2 n) by 2 do
          (let ((x (%mod-nCk i (+ n k -1) +mod+))
                (y (%mod-nCk i (+ n k) +mod+)))
            (incf k)
            (setq res (mod (+ res x (- y)) +mod+))))
    (format t "~d~%" res)))

(main)
0