{ "data": { "question": { "questionId": "1000093", "questionFrontendId": "LCP 13", "categoryTitle": "Algorithms", "boundTopicId": 219341, "title": "寻宝", "titleSlug": "xun-bao", "content": "", "translatedTitle": "寻宝", "translatedContent": "

我们得到了一副藏宝图，藏宝图显示，在一个迷宫中存在着未被世人发现的宝藏。

\n\n

迷宫是一个二维矩阵，用一个字符串数组表示。它标识了唯一的入口（用 'S' 表示），和唯一的宝藏地点（用 'T' 表示）。但是，宝藏被一些隐蔽的机关保护了起来。在地图上有若干个机关点（用 'M' 表示），只有所有机关均被触发，才可以拿到宝藏。

\n\n

要保持机关的触发，需要把一个重石放在上面。迷宫中有若干个石堆（用 'O' 表示），每个石堆都有无限个足够触发机关的重石。但是由于石头太重，我们一次只能搬一个石头到指定地点。

\n\n

迷宫中同样有一些墙壁（用 '#' 表示），我们不能走入墙壁。剩余的都是可随意通行的点（用 '.' 表示）。石堆、机关、起点和终点（无论是否能拿到宝藏）也是可以通行的。

\n\n

我们每步可以选择向上/向下/向左/向右移动一格，并且不能移出迷宫。搬起石头和放下石头不算步数。那么，从起点开始，我们最少需要多少步才能最后拿到宝藏呢？如果无法拿到宝藏，返回 -1 。

\n\n

示例 1：

\n\n
\n

输入： ["S#O", "M..", "M.T"]

\n\n

输出：16

\n\n

解释：最优路线为： S->O, cost = 4, 去搬石头 O->第二行的M, cost = 3, M机关触发 第二行的M->O, cost = 3, 我们需要继续回去 O 搬石头。 O->第三行的M, cost = 4, 此时所有机关均触发 第三行的M->T, cost = 2，去T点拿宝藏。 总步数为16。 \"图片.gif\"

\n
\n\n

示例 2：

\n\n
\n

输入： ["S#O", "M.#", "M.T"]

\n\n

输出：-1

\n\n

解释：我们无法搬到石头触发机关

\n
\n\n

示例 3：

\n\n
\n

输入： ["S#O", "M.T", "M.."]

\n\n

输出：17

\n\n

解释：注意终点也是可以通行的。

\n
\n\n

限制：

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