![\"\"](\"https://assets.leetcode.com/uploads/2021/12/24/laser1.jpg\")
Anti-theft security devices are activated inside a bank. You are given a 0-indexed binary string array bank representing the floor plan of the bank, which is an m x n 2D matrix. bank[i] represents the ith row, consisting of '0's and '1's. '0' means the cell is empty, while'1' means the cell has a security device.
There is one laser beam between any two security devices if both conditions are met:
\n\nr1 and r2, where r1 < r2.i where r1 < i < r2, there are no security devices in the ith row.Laser beams are independent, i.e., one beam does not interfere nor join with another.
\n\nReturn the total number of laser beams in the bank.
\n\n\n
Example 1:
\n\n\nInput: bank = ["011001","000000","010100","001000"]\nOutput: 8\nExplanation: Between each of the following device pairs, there is one beam. In total, there are 8 beams:\n * bank[0][1] -- bank[2][1]\n * bank[0][1] -- bank[2][3]\n * bank[0][2] -- bank[2][1]\n * bank[0][2] -- bank[2][3]\n * bank[0][5] -- bank[2][1]\n * bank[0][5] -- bank[2][3]\n * bank[2][1] -- bank[3][2]\n * bank[2][3] -- bank[3][2]\nNote that there is no beam between any device on the 0th row with any on the 3rd row.\nThis is because the 2nd row contains security devices, which breaks the second condition.\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2021/12/24/laser2.jpg\")
\n\nInput: bank = ["000","111","000"]\nOutput: 0\nExplanation: There does not exist two devices located on two different rows.\n\n\n
\n
Constraints:
\n\nm == bank.lengthn == bank[i].length1 <= m, n <= 500bank[i][j] is either '0' or '1'.银行内部的防盗安全装置已经激活。给你一个下标从 0 开始的二进制字符串数组 bank ，表示银行的平面图，这是一个大小为 m x n 的二维矩阵。 bank[i] 表示第 i 行的设备分布，由若干 '0' 和若干 '1' 组成。'0' 表示单元格是空的，而 '1' 表示单元格有一个安全设备。
对任意两个安全设备而言，如果同时 满足下面两个条件，则二者之间存在 一个 激光束：
\n\nr1 和 r2 ，其中 r1 < r2 。r1 < i < r2 的 所有 行 i ，都 没有安全设备 。激光束是独立的，也就是说，一个激光束既不会干扰另一个激光束，也不会与另一个激光束合并成一束。
\n\n返回银行中激光束的总数量。
\n\n\n\n
示例 1：
\n\n
\n输入：bank = [\"011001\",\"000000\",\"010100\",\"001000\"]\n输出：8\n解释：在下面每组设备对之间，存在一条激光束。总共是 8 条激光束：\n * bank[0][1] -- bank[2][1]\n * bank[0][1] -- bank[2][3]\n * bank[0][2] -- bank[2][1]\n * bank[0][2] -- bank[2][3]\n * bank[0][5] -- bank[2][1]\n * bank[0][5] -- bank[2][3]\n * bank[2][1] -- bank[3][2]\n * bank[2][3] -- bank[3][2]\n注意，第 0 行和第 3 行上的设备之间不存在激光束。\n这是因为第 2 行存在安全设备，这不满足第 2 个条件。\n\n\n
示例 2：
\n\n
\n输入：bank = [\"000\",\"111\",\"000\"]\n输出：0\n解释：不存在两个位于不同行的设备\n\n\n
\n\n
提示：
\n\nm == bank.lengthn == bank[i].length1 <= m, n <= 500bank[i][j] 为 '0' 或 '1'\\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>\"],\"java\":[\"Java\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u88ab\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5305\\u542b Pair \\u7c7b: https:\\/\\/docs.oracle.com\\/javase\\/8\\/javafx\\/api\\/javafx\\/util\\/Pair.html <\\/p>\"],\"python\":[\"Python\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u5e38\\u7528\\u5e93\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8 \\u5bfc\\u5165\\uff0c\\u5982\\uff1aarray<\\/a>, bisect<\\/a>, 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