스티브: 야 리튬
리튬: 왜?
스티브: 이 게임 좀 봐봐.
리튬: 음? 이게 왜?
스티브: 내 캐릭터가 지금 9x9격자판의 한쪽꼭짓점에 서있어. 반대편 끝까지 가서 코인을 먹어야 돼.
리튬: 그럼 쉽잖아!
스티브: 근데 지금 내가 서있는곳과 도착지점은 레이저로 이어져있어.
리튬: 닿으면 죽겠네.
스티브: 아니, 괜찮아. 근데 선을 넘으면 죽어. 한마디로 격자판의 한 대각선으로 나뉘어진 영역 중 하나만 거쳐야돼.
리튬: 그래서 뭐가 문젠데?
스티브: 나, 저기까지 가는 방법엔 몇가지가 있을까? 그게 시도가능횟수랑 같거든. 최단경로여야 하고.
스티브의 질문을 해결해주세요!
(여러분 조합 능력치를 보고 싶습니다. 근데 아는분은 더할 나위 없이 쉽고 모르시는 분은 어려울거예요.)
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