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g0701_0800.s0777_swap_adjacent_in_lr_string.readme.md Maven / Gradle / Ivy

777\. Swap Adjacent in LR String

Medium

In a string composed of `'L'`, `'R'`, and `'X'` characters, like `"RXXLRXRXL"`, a move consists of either replacing one occurrence of `"XL"` with `"LX"`, or replacing one occurrence of `"RX"` with `"XR"`. Given the starting string `start` and the ending string `end`, return `True` if and only if there exists a sequence of moves to transform one string to the other.

**Example 1:**

**Input:** start = "RXXLRXRXL", end = "XRLXXRRLX"

**Output:** true

**Explanation:**

    We can transform start to end following these steps:
    RXXLRXRXL ->
    XRXLRXRXL ->
    XRLXRXRXL ->
    XRLXXRRXL ->
    XRLXXRRLX 

**Example 2:**

**Input:** start = "X", end = "L"

**Output:** false 

**Constraints:**

*   1 <= start.length <= 104
*   `start.length == end.length`
*   Both `start` and `end` will only consist of characters in `'L'`, `'R'`, and `'X'`.