move-pieces-to-obtain-a-string

Move Pieces to Obtain a String

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You are given two strings <code>start</code> and <code>target</code>, both of length <code>n</code>. Each string consists only of the characters <code>&#39;L&#39;</code>, <code>&#39;R&#39;</code>, and <code>&#39;_&#39;</code> where:

<ul>
	<li>The characters <code>&#39;L&#39;</code> and <code>&#39;R&#39;</code> represent pieces, where a piece <code>&#39;L&#39;</code> can move to the left only if there is a blank space directly to its left, and a piece <code>&#39;R&#39;</code> can move to the right only if there is a blank space directly to its right.</li>
	<li>The character <code>&#39;_&#39;</code> represents a blank space that can be occupied by any of the <code>&#39;L&#39;</code> or <code>&#39;R&#39;</code> pieces.</li>
</ul>

Return <code>true</code> if it is possible to obtain the string <code>target</code> by moving the pieces of the string <code>start</code> any number of times. Otherwise, return <code>false</code>.

&nbsp;
Example 1:

<pre>
Input: start = &quot;_L__R__R_&quot;, target = &quot;L______RR&quot;
Output: true
Explanation: We can obtain the string target from start by doing the following moves:
- Move the first piece one step to the left, start becomes equal to &quot;L___R__R_&quot;.
- Move the last piece one step to the right, start becomes equal to &quot;L___R___R&quot;.
- Move the second piece three steps to the right, start becomes equal to &quot;L______RR&quot;.
Since it is possible to get the string target from start, we return true.
</pre>

Example 2:

<pre>
Input: start = &quot;R_L_&quot;, target = &quot;__LR&quot;
Output: false
Explanation: The &#39;R&#39; piece in the string start can move one step to the right to obtain &quot;_RL_&quot;.
After that, no pieces can move anymore, so it is impossible to obtain the string target from start.
</pre>

Example 3:

<pre>
Input: start = &quot;_R&quot;, target = &quot;R_&quot;
Output: false
Explanation: The piece in the string start can move only to the right, so it is impossible to obtain the string target from start.</pre>

&nbsp;
Constraints:

<ul>
	<li><code>n == start.length == target.length</code></li>
	<li><code>1 &lt;= n &lt;= 105</code></li>
	<li><code>start</code> and <code>target</code> consist of the characters <code>&#39;L&#39;</code>, <code>&#39;R&#39;</code>, and <code>&#39;_&#39;</code>.</li>
</ul>

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