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【注意只能向上下左右相邻四个点之一滑】（AC 10道题了～）一个人可以从某个点滑向上下左右相邻四个点之一，当且仅当高度减小。
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我没看见这一句，就当是八个方向，结果交了N+1次，都WA，现在AC了哈～
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