You are given an array of n strings strs, all of the same length.
We may choose any deletion indices, and we delete all the characters in those indices for each string.
\n\nFor example, if we have strs = ["abcdef","uvwxyz"] and deletion indices {0, 2, 3}, then the final array after deletions is ["bef", "vyz"].
Suppose we chose a set of deletion indices answer such that after deletions, the final array has its elements in lexicographic order (i.e., strs[0] <= strs[1] <= strs[2] <= ... <= strs[n - 1]). Return the minimum possible value of answer.length.
\n
Example 1:
\n\n\nInput: strs = ["ca","bb","ac"]\nOutput: 1\nExplanation: \nAfter deleting the first column, strs = ["a", "b", "c"].\nNow strs is in lexicographic order (ie. strs[0] <= strs[1] <= strs[2]).\nWe require at least 1 deletion since initially strs was not in lexicographic order, so the answer is 1.\n\n\n
Example 2:
\n\n\nInput: strs = ["xc","yb","za"]\nOutput: 0\nExplanation: \nstrs is already in lexicographic order, so we do not need to delete anything.\nNote that the rows of strs are not necessarily in lexicographic order:\ni.e., it is NOT necessarily true that (strs[0][0] <= strs[0][1] <= ...)\n\n\n
Example 3:
\n\n\nInput: strs = ["zyx","wvu","tsr"]\nOutput: 3\nExplanation: We have to delete every column.\n\n\n
\n
Constraints:
\n\nn == strs.length1 <= n <= 1001 <= strs[i].length <= 100strs[i] consists of lowercase English letters.给定由 n 个字符串组成的数组 strs，其中每个字符串长度相等。
选取一个删除索引序列，对于 strs 中的每个字符串，删除对应每个索引处的字符。
比如，有 strs = [\"abcdef\", \"uvwxyz\"]，删除索引序列 {0, 2, 3}，删除后 strs 为[\"bef\", \"vyz\"]。
假设，我们选择了一组删除索引 answer，那么在执行删除操作之后，最终得到的数组的元素是按 字典序（strs[0] <= strs[1] <= strs[2] ... <= strs[n - 1]）排列的，然后请你返回 answer.length 的最小可能值。
\n\n
示例 1：
\n\n\n输入：strs = [\"ca\",\"bb\",\"ac\"]\n输出：1\n解释： \n删除第一列后，strs = [\"a\", \"b\", \"c\"]。\n现在 strs 中元素是按字典排列的 (即，strs[0] <= strs[1] <= strs[2])。\n我们至少需要进行 1 次删除，因为最初 strs 不是按字典序排列的，所以答案是 1。\n\n\n
示例 2：
\n\n\n输入：strs = [\"xc\",\"yb\",\"za\"]\n输出：0\n解释：\nstrs 的列已经是按字典序排列了，所以我们不需要删除任何东西。\n注意 strs 的行不需要按字典序排列。\n也就是说，strs[0][0] <= strs[0][1] <= ... 不一定成立。\n\n\n
示例 3：
\n\n\n输入：strs = [\"zyx\",\"wvu\",\"tsr\"]\n输出：3\n解释：\n我们必须删掉每一列。\n\n\n
\n\n
提示：
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