BrokenKeyboardRepair | Topcoder Archive

Problem Statement

All the alphabetical keys on your keyboard are broken. Given a String word, return the minimal number of keys you must repair to be able to type word.

Definition

Class:: BrokenKeyboardRepair
Method:: minimalNumberOfKeys
Parameters:: String
Returns:: int
Method signature:: int minimalNumberOfKeys(String word)
(be sure your method is public)

Constraints

word will contain between 1 and 50 characters, inclusive.
word will contain only lowercase letters ('a'-'z').

Examples

```
"coder"
```
```
Returns: 5
```
You have to repair the following keys: 'c', 'd', 'e', 'o', 'r'.
```
"hello"
```
```
Returns: 4
```
You have to repair the following keys: 'e', 'h', 'l', 'o'.
```
"abracadabra"
```
```
Returns: 5
```
You have to repair the following keys: 'a', 'b', 'c', 'd', 'r'.

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