description 問題 history 提出状況 question_mark 質問 how_to_vote 投票 #2742 upload 189 done 77 how_to_reg 57 call_split サブタスク 쭈노의 8퍼즐(8puzzle-거리만) timer 2s memory 256MB keyboard_tab_rtl chevron_left 491 492 493 494 495 496 497 498 499 500 chevron_right keyboard_tab