> For the complete documentation index, see [llms.txt](https://dfine.gitbook.io/leetcode/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dfine.gitbook.io/leetcode/944.delete_column_to_make_sorted.md).

# 944.Delete Column to Make Sorted

**944.Delete Columns to Make Sorted**

> 给出由 N 个小写字母串组成的数组 A，所有小写字母串的长度都相同。 现在，我们可以选择任何一组删除索引，对于每个字符串，我们将删除这些索引中的所有字符。 举个例子，如果字符串为 "abcdef"，且删除索引是 {0, 2, 3}，那么删除之后的最终字符串为 "bef"。 假设我们选择了一组删除索引 D，在执行删除操作之后，A 中剩余的每一列都是有序的。 形式上，第 c 列为 `[A[0][c], A[1][c], ..., A[A.length-1][c]]` 返回 D.length 的最小可能值。

```
示例 1：

输入：["cba","daf","ghi"]
输出：1
示例 2：

输入：["a","b"]
输出：0
示例 3：

输入：["zyx","wvu","tsr"]
输出：3


提示：

1 <= A.length <= 100
1 <= A[i].length <= 1000
```

方法： 直接判断每一列是不是递增的，不是的话就需要删掉。循环一次即可。

```
class Solution {
public:
    int minDeletionSize(vector<string>& A) {
        int result=0;
        for(int i=0;i<A[0].length();i++)
            for(int j=1;j< A.size();j++)
            {
                if(A[j-1][i]>A[j][i])
                {
                    result++;
                    break;}
            }
        return result;
    }
};
```


---

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