CardsShuffle | Topcoder Archive

Problem Statement

You are given a String cards, which represents a sequence of cards. Shuffle the cards by repeatedly performing the specified exchange operation. The exchange operation is specified by the ints first and last, which are both 1-based indices in the sequence. Take all the cards between the first-th card and the last-th card, inclusive, and move them to the beginning of the sequence. Do not change the relative order of the moved cards. For example, if first = 2 and last = 4, an exchange operation on "ABCDEFG" would produce "BCDAEFG".

Perform the specified exchange operation times times on the given sequence and return a String containing the resulting sequence.

Definition

Class:: CardsShuffle
Method:: shuffle
Parameters:: String, int, int, int
Returns:: String
Method signature:: String shuffle(String cards, int first, int last, int times)
(be sure your method is public)

Constraints

cards will contain between 1 and 50 characters, inclusive.
cards will contain only uppercase letters ('A'-'Z').
first will be between 1 and n, inclusive, where n is the number of characters in cards.
last will be between first and n, inclusive, where n is the number of characters in cards.
times will be between 1 and 100, inclusive.

Examples

```
"NW"
```
```
2
```
```
2
```
```
9
```
```
Returns: "WN"
```
It always moves the second card to the front.
```
"BMQ"
```
```
1
```
```
2
```
```
2
```
```
Returns: "BMQ"
```
This operation does not change anything.
```
"KYHID"
```
```
3
```
```
5
```
```
8
```
```
Returns: "YHIDK"
```
```
"YGGXXPKLO"
```
```
8
```
```
9
```
```
63
```
```
Returns: "YGGXXPKLO"
```
cards may contain duplicate characters.
```
"KMCOQHNWNKU"
```
```
9
```
```
10
```
```
9
```
```
Returns: "COQHNWNKKMU"
```

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