OrderlyString | Topcoder Archive

Problem Statement

You are given String s consisting of characters 'A'-'Z'.

You wish to delete some characters from the string, such that the characters that remain are all in non-decreasing order.

Return the length of the longest possible string that remains.

Definition

Class:: OrderlyString
Method:: longestLength
Parameters:: String
Returns:: int
Method signature:: int longestLength(String s)
(be sure your method is public)

Constraints

s will contain between 1 and 200 characters, inclusive.
Each character of s will be in the range 'A'-'Z'.

Examples

```
"ABCDEFG"
```
```
Returns: 7
```
We don't actually need to remove any characters.
```
"GFEDCBA"
```
```
Returns: 1
```
The characters initially are all in the wrong order, best we can do is leave only one.
```
"ACBB"
```
```
Returns: 3
```
ABB is the longest.

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