Move Pieces to Obtain a String
You are given two strings start and target, both of length n. Each string consists only of the characters 'L', 'R', and '_' where:
- The characters
'L'and'R'represent pieces, where a piece'L'can move to the left only if there is a blank space directly to its left, and a piece'R'can move to the right only if there is a blank space directly to its right. - The character
'_'represents a blank space that can be occupied by any of the'L'or'R'pieces.
Return true if it is possible to obtain the string target by moving the pieces of the string start any number of times. Otherwise, return false.
Example 1
Input
start = "_L__R__R_", target = "L______RR"Output
trueWe can move the first piece left, the last piece right, and then the second piece three steps right to obtain
target from start.Example 2
Input
start = "R_L_", target = "__LR"Output
falseAfter moving the
R piece one step right, no pieces can move anymore, so it is impossible to obtain target from start.Constraints
- n == start.length == target.length
- 1 <= n <= 10^5
- start and target consist of the characters 'L', 'R', and '_'