## Problem – Excel Sheet Column Number

Given a string `columnTitle`

that represents the column title as appears in an Excel sheet, return *its corresponding column number*.

For example:

```
A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28
...
```

**Example 1:**

```
Input: columnTitle = "A"
Output: 1
```

**Example 2:**

```
Input: columnTitle = "AB"
Output: 28
```

**Example 3:**

```
Input: columnTitle = "ZY"
Output: 701
```

**Constraints:**

`1 <= columnTitle.length <= 7`

`columnTitle`

consists only of uppercase English letters.`columnTitle`

is in the range `["A", "FXSHRXW"]`

.

### Excel Sheet Column Number LeetCode Solution in Java

```
int result = 0;
for (int i = 0; i < s.length(); result = result * 26 + (s.charAt(i) - 'A' + 1), i++);
return result;
```

### Excel Sheet Column Number LeetCode Solution in C++

```
int result = 0;
for (int i = 0; i < s.size(); result = result * 26 + (s.at(i) - 'A' + 1), i++);
return result;
```

### Excel Sheet Column Number LeetCode Solution in Python

```
return reduce(lambda x, y : x * 26 + y, [ord(c) - 64 for c in list(s)])
```

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