![\"\"](\"https://assets.leetcode.com/uploads/2022/10/19/q1ex1.jpg\")
You are given an m x n matrix grid consisting of positive integers.
Perform the following operation until grid becomes empty:
Note that the number of columns decreases by one after each operation.
\n\nReturn the answer after performing the operations described above.
\n\n\n
Example 1:
\n\n\nInput: grid = [[1,2,4],[3,3,1]]\nOutput: 8\nExplanation: The diagram above shows the removed values in each step.\n- In the first operation, we remove 4 from the first row and 3 from the second row (notice that, there are two cells with value 3 and we can remove any of them). We add 4 to the answer.\n- In the second operation, we remove 2 from the first row and 3 from the second row. We add 3 to the answer.\n- In the third operation, we remove 1 from the first row and 1 from the second row. We add 1 to the answer.\nThe final answer = 4 + 3 + 1 = 8.\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2022/10/19/q1ex2.jpg\")
\n\nInput: grid = [[10]]\nOutput: 10\nExplanation: The diagram above shows the removed values in each step.\n- In the first operation, we remove 10 from the first row. We add 10 to the answer.\nThe final answer = 10.\n\n\n
\n
Constraints:
\n\nm == grid.lengthn == grid[i].length1 <= m, n <= 501 <= grid[i][j] <= 100给你一个 m x n 大小的矩阵 grid ，由若干正整数组成。
执行下述操作，直到 grid 变为空矩阵：
注意 每执行一次操作，矩阵中列的数据就会减 1 。
\n\n返回执行上述操作后的答案。
\n\n\n\n
示例 1：
\n\n
\n输入：grid = [[1,2,4],[3,3,1]]\n输出：8\n解释：上图展示在每一步中需要移除的值。\n- 在第一步操作中，从第一行删除 4 ，从第二行删除 3（注意，有两个单元格中的值为 3 ，我们可以删除任一）。在答案上加 4 。\n- 在第二步操作中，从第一行删除 2 ，从第二行删除 3 。在答案上加 3 。\n- 在第三步操作中，从第一行删除 1 ，从第二行删除 1 。在答案上加 1 。\n最终，答案 = 4 + 3 + 1 = 8 。\n\n\n
示例 2：
\n\n
\n输入：grid = [[10]]\n输出：10\n解释：上图展示在每一步中需要移除的值。\n- 在第一步操作中，从第一行删除 10 。在答案上加 10 。\n最终，答案 = 10 。\n\n\n
\n\n
提示：
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\\u6a21\\u5757\\u4e2d\\u63d0\\u4f9b\\uff1ahttps:\\/\\/www.rubydoc.info\\/github\\/kanwei\\/algorithms\\/Algorithms<\\/p>\"],\"swift\":[\"Swift\",\" \\u7248\\u672c\\uff1a \\u6211\\u4eec\\u901a\\u5e38\\u4fdd\\u8bc1\\u66f4\\u65b0\\u5230 Apple\\u653e\\u51fa\\u7684\\u6700\\u65b0\\u7248Swift<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u53d1\\u73b0Swift\\u4e0d\\u662f\\u6700\\u65b0\\u7248\\u7684\\uff0c\\u8bf7\\u8054\\u7cfb\\u6211\\u4eec\\uff01\\u6211\\u4eec\\u5c06\\u5c3d\\u5feb\\u66f4\\u65b0\\u3002<\\/p>\"],\"golang\":[\"Go\",\" \\u7248\\u672c\\uff1a \\u652f\\u6301 https:\\/\\/godoc.org\\/github.com\\/emirpasic\\/gods@v1.18.1<\\/a> \\u7b2c\\u4e09\\u65b9\\u5e93\\u3002<\\/p>\"],\"python3\":[\"Python3\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u5e38\\u7528\\u5e93\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8 \\u5bfc\\u5165\\uff0c\\u5982array<\\/a>, bisect<\\/a>, collections<\\/a>\\u3002 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