結果
| 問題 |
No.1211 円環はお断り
|
| コンテスト | |
| ユーザー |
 sansaqua
|
| 提出日時 | 2020-08-30 15:09:47 |
| 言語 | Common Lisp (sbcl 2.5.0) |
| 結果 |
AC
|
| 実行時間 | 1,313 ms / 2,000 ms |
| コード長 | 6,475 bytes |
| コンパイル時間 | 94 ms |
| コンパイル使用メモリ | 37,504 KB |
| 実行使用メモリ | 129,920 KB |
| 最終ジャッジ日時 | 2024-11-23 16:18:33 |
| 合計ジャッジ時間 | 23,291 ms |
|
ジャッジサーバーID （参考情報） |
judge5 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 41 |
コンパイルメッセージ
; compiling file "/home/judge/data/code/Main.lisp" (written 23 NOV 2024 04:18:07 PM): ; wrote /home/judge/data/code/Main.fasl ; compilation finished in 0:00:00.042
ソースコード
(in-package :cl-user)
(eval-when (:compile-toplevel :load-toplevel :execute)
(sb-int:defconstant-eqx opt
#+swank '(optimize (speed 3) (safety 2))
#-swank '(optimize (speed 3) (safety 0) (debug 0))
#'equal)
#+swank (ql:quickload '(:cl-debug-print :fiveam) :silent t)
#-swank (set-dispatch-macro-character
#\# #\> (lambda (s c p) (declare (ignore c p)) `(values ,(read s nil nil t)))))
#+swank (cl-syntax:use-syntax cl-debug-print:debug-print-syntax)
(defmacro define-int-types (&rest bits)
`(progn
,@(mapcar (lambda (b) `(deftype ,(intern (format nil "UINT~A" b)) () '(unsigned-byte ,b))) bits)
,@(mapcar (lambda (b) `(deftype ,(intern (format nil "INT~A" b)) () '(signed-byte ,b))) bits)))
(define-int-types 2 4 7 8 15 16 31 32 62 63 64)
(defconstant +mod+ 1000000007)
(defmacro dbg (&rest forms)
#+swank (if (= (length forms) 1)
`(format *error-output* "~A => ~A~%" ',(car forms) ,(car forms))
`(format *error-output* "~A => ~A~%" ',forms `(,,@forms)))
#-swank (declare (ignore forms)))
(declaim (inline println))
(defun println (obj &optional (stream *standard-output*))
(let ((*read-default-float-format* 'double-float))
(prog1 (princ obj stream) (terpri stream))))
;; BEGIN_INSERTED_CONTENTS
(defpackage :cp/read-fixnum
(:use :cl)
(:export #:read-fixnum))
(in-package :cp/read-fixnum)
(declaim (ftype (function * (values fixnum &optional)) read-fixnum))
(defun read-fixnum (&optional (in *standard-input*))
"NOTE: cannot read -2^62"
(macrolet ((%read-byte ()
`(the (unsigned-byte 8)
#+swank (char-code (read-char in nil #\Nul))
#-swank (sb-impl::ansi-stream-read-byte in nil #.(char-code #\Nul) nil))))
(let* ((minus nil)
(result (loop (let ((byte (%read-byte)))
(cond ((<= 48 byte 57)
(return (- byte 48)))
((zerop byte) ; #\Nul
(error "Read EOF or #\Nul."))
((= byte #.(char-code #\-))
(setq minus t)))))))
(declare ((integer 0 #.most-positive-fixnum) result))
(loop
(let* ((byte (%read-byte)))
(if (<= 48 byte 57)
(setq result (+ (- byte 48)
(* 10 (the (integer 0 #.(floor most-positive-fixnum 10))
result))))
(return (if minus (- result) result))))))))
;; BEGIN_USE_PACKAGE
(eval-when (:compile-toplevel :load-toplevel :execute)
(use-package :cp/read-fixnum :cl-user))
(in-package :cl-user)
;;;
;;; Body
;;;
(defconstant +max-depth+ 17)
(defun feasible-p (n k cumuls threshold)
(declare #.cl-user::opt
(uint31 n k)
((simple-array uint62 (*)) cumuls)
(uint62 threshold))
(let ((dp (make-array (list +max-depth+ n) :element-type 'uint62 :initial-element 0))
(dest 0))
(dotimes (src n)
(loop while (< (- (aref cumuls dest) (aref cumuls src)) threshold)
do (incf dest))
(setf (aref dp 0 src) (- dest src)))
(loop for depth from 1 below +max-depth+
do (dotimes (i n)
(let ((prev-delta (aref dp (- depth 1) i)))
(setf (aref dp depth i)
(+ prev-delta
(+ (aref dp (- depth 1) (mod (+ i prev-delta) n))))))))
(dotimes (init n)
(let ((count 0)
(stride 0))
(declare (uint62 count stride))
(loop for depth from (- +max-depth+ 1) downto 0
for delta = (ash 1 depth)
when (<= (+ count delta) k)
do (incf stride (aref dp depth (mod (+ init stride) n)))
(incf count delta)
while (<= stride n))
(when (<= stride n)
(return-from feasible-p t))))
nil))
(defun main ()
(let* ((n (read))
(k (read))
(as (make-array n :element-type 'uint31 :initial-element 0))
(cumuls (make-array (+ 1 (* 2 n)) :element-type 'uint62 :initial-element 0)))
(dotimes (i n)
(let ((a (read-fixnum)))
(setf (aref as i) a
(aref cumuls (+ i 1)) a
(aref cumuls (+ i n 1)) a)))
(dotimes (i (* 2 n))
(incf (aref cumuls (+ i 1)) (aref cumuls i)))
(sb-int:named-let bisect ((ok 0) (ng (+ 1 (aref cumuls n))))
(if (<= (- ng ok) 1)
(println ok)
(let ((mid (ash (+ ok ng) -1)))
#>mid
(if (feasible-p n k cumuls mid)
(bisect mid ng)
(bisect ok mid)))))))
#-swank (main)
;;;
;;; Test and benchmark
;;;
#+swank
(defun get-clipbrd ()
(with-output-to-string (out)
#+os-windows (run-program "powershell.exe" '("-Command" "Get-Clipboard") :output out :search t)
#+os-unix (run-program "xsel" '("-b" "-o") :output out :search t)))
#+swank (defparameter *this-pathname* (uiop:current-lisp-file-pathname))
#+swank (defparameter *dat-pathname* (uiop:merge-pathnames* "test.dat" *this-pathname*))
#+swank
(defun run (&optional thing (out *standard-output*))
"THING := null | string | symbol | pathname
null: run #'MAIN using the text on clipboard as input.
string: run #'MAIN using the string as input.
symbol: alias of FIVEAM:RUN!.
pathname: run #'MAIN using the text file as input."
(let* ((*standard-output* (or out (make-string-output-stream)))
(res (etypecase thing
(null
(with-input-from-string (*standard-input* (delete #\Return (get-clipbrd)))
(main)))
(string
(with-input-from-string (*standard-input* (delete #\Return thing))
(main)))
(symbol (5am:run! thing))
(pathname
(with-open-file (*standard-input* thing)
(main))))))
(if out res (get-output-stream-string *standard-output*))))
#+swank
(defun gen-dat ()
(uiop:with-output-file (out *dat-pathname* :if-exists :supersede)
(format out "")))
#+swank
(defun bench (&optional (out (make-broadcast-stream)))
(time (run *dat-pathname* out)))
;; To run: (5am:run! :sample)
#+swank
(it.bese.fiveam:test :sample
(it.bese.fiveam:is
(equal "4
"
(run "6 4
8 6 9 1 2 1
" nil)))
(it.bese.fiveam:is
(equal "15
"
(run "15 7
12 9 11 15 15 11 9 7 2 3 1 14 15 6 11
" nil))))