OneDimensionalRobotEasy | Topcoder Archive

Problem Statement

A robot is placed on an infinitely long line. Initially the position of the robot is 0. Cat Snuke sends commands to move this robot.

You are given a String commands. For each i, the i-th character of commands (0-based index) represents the i-th command Snuke sends. If the i-th character of commands is 'R', the robot moves one unit to the right (i.e., from position x to position x+1). If this character is 'L', the robot moves one unit to the left (i.e., from position x to position x-1). The robot has a built-in safety mechanism that prevents it from going too far and losing the signal. The safety mechanism makes sure that the robot always stays between the positions -A and B, inclusive. If the robot receives the command 'R' when the robot is at B, or the command 'L' when the robot is at -A, the command will be ignored.

You are given the String commands and the ints A and B. Return the final position of the robot.

Definition

Class:: OneDimensionalRobotEasy
Method:: finalPosition
Parameters:: String, int, int
Returns:: int
Method signature:: int finalPosition(String commands, int A, int B)
(be sure your method is public)

Constraints

commands will contain between 1 and 50 characters, inclusive.
Each character in commands will be either 'R' or 'L'.
A and B will be between 1 and 50, inclusive.

Examples

```
"RRLRRLLR"
```
```
10
```
```
10
```
```
Returns: 2
```
The robot will move as follows: 0 -> 1 -> 2 -> 1 -> 2 -> 3 -> 2 -> 1 -> 2.
```
"RRRRR"
```
```
3
```
```
4
```
```
Returns: 4
```
The robot will move as follows: 0 -> 1 -> 2 -> 3 -> 4 -> 4.
```
"LLLLLLLLLLR"
```
```
2
```
```
6
```
```
Returns: -1
```
The robot will move as follows: 0 -> -1 -> -2 -> -2 -> -2 -> -2 -> -2 -> -2 -> -2 -> -2 -> -2 -> -1.

"RRRRRRRLRRLRRRRRRRRRRRRLRLRRRRRRRRLRRRRRLRRRRRRRRR"

Returns: 20

"RLRLLLLLLLRLLLRLLLLLLLLRLLLLLRLLLRRLLLLLRLLLLLRLLL"

Returns: -30

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