![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/03/21/main.png\")
You are given an m x n grid. Each cell of grid represents a street. The street of grid[i][j] can be:
1 which means a street connecting the left cell and the right cell.2 which means a street connecting the upper cell and the lower cell.3 which means a street connecting the left cell and the lower cell.4 which means a street connecting the right cell and the lower cell.5 which means a street connecting the left cell and the upper cell.6 which means a street connecting the right cell and the upper cell.![\"\"](\"https://assets.leetcode.com/uploads/2020/03/05/main.png\")
\nYou will initially start at the street of the upper-left cell (0, 0). A valid path in the grid is a path that starts from the upper left cell (0, 0) and ends at the bottom-right cell (m - 1, n - 1). The path should only follow the streets.
Notice that you are not allowed to change any street.
\n\nReturn true if there is a valid path in the grid or false otherwise.
\n
Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2020/03/05/e1.png\")
\n\nInput: grid = [[2,4,3],[6,5,2]]\nOutput: true\nExplanation: As shown you can start at cell (0, 0) and visit all the cells of the grid to reach (m - 1, n - 1).\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2020/03/05/e2.png\")
\n\nInput: grid = [[1,2,1],[1,2,1]]\nOutput: false\nExplanation: As shown you the street at cell (0, 0) is not connected with any street of any other cell and you will get stuck at cell (0, 0)\n\n\n
Example 3:
\n\n\nInput: grid = [[1,1,2]]\nOutput: false\nExplanation: You will get stuck at cell (0, 1) and you cannot reach cell (0, 2).\n\n\n
\n
Constraints:
\n\nm == grid.lengthn == grid[i].length1 <= m, n <= 3001 <= grid[i][j] <= 6给你一个 m x n 的网格 grid。网格里的每个单元都代表一条街道。grid[i][j] 的街道可以是：
你最开始从左上角的单元格 (0,0) 开始出发，网格中的「有效路径」是指从左上方的单元格 (0,0) 开始、一直到右下方的 (m-1,n-1) 结束的路径。该路径必须只沿着街道走。
注意：你 不能 变更街道。
\n\n如果网格中存在有效的路径，则返回 true，否则返回 false 。
\n\n
示例 1：
\n\n![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/03/21/e1.png\")
输入：grid = [[2,4,3],[6,5,2]]\n输出：true\n解释：如图所示，你可以从 (0, 0) 开始，访问网格中的所有单元格并到达 (m - 1, n - 1) 。\n\n\n
示例 2：
\n\n![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/03/21/e2.png\")
输入：grid = [[1,2,1],[1,2,1]]\n输出：false\n解释：如图所示，单元格 (0, 0) 上的街道没有与任何其他单元格上的街道相连，你只会停在 (0, 0) 处。\n\n\n
示例 3：
\n\n输入：grid = [[1,1,2]]\n输出：false\n解释：你会停在 (0, 1)，而且无法到达 (0, 2) 。\n\n\n
示例 4：
\n\n输入：grid = [[1,1,1,1,1,1,3]]\n输出：true\n\n\n
示例 5：
\n\n输入：grid = [[2],[2],[2],[2],[2],[2],[6]]\n输出：true\n\n\n
\n\n
提示：
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collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u6ce8\\u610f Python 2.7 \\u5c06\\u57282020\\u5e74\\u540e\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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