Move Pieces to Obtain a String - Practice Coding | SlaveCode
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2337. Move Pieces to Obtain a String
Medium
30 Points
Two Pointers
String
You are given two strings start and target, both of length n. Each string consists only of the characters 'L', 'R', and '_' where:
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.
Examples
Example 1
Input: start = "_L__R__R_", target = "L______RR"
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 "L___R__R_".
- Move the last piece one step to the right, start becomes equal to "L___R___R".
- Move the second piece three steps to the right, start becomes equal to "L______RR".
Since it is possible to get the string target from start, we return true.
Example 2
Input: start = "R_L_", target = "__LR"
Output: false
Explanation: The 'R' piece in the string start can move one step to the right to obtain "_RL_".
After that, no pieces can move anymore, so it is impossible to obtain the string target from start.
Example 3
Input: start = "_R", target = "R_"
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.
Constraints
n == start.length == target.length
1 <= n <= 105
start and target consist of the characters 'L', 'R', and '_'.
2337. Move Pieces to Obtain a String
Medium
30 Points
Two Pointers
String
You are given two strings start and target, both of length n. Each string consists only of the characters 'L', 'R', and '_' where:
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.
Examples
Example 1
Input: start = "_L__R__R_", target = "L______RR"
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 "L___R__R_".
- Move the last piece one step to the right, start becomes equal to "L___R___R".
- Move the second piece three steps to the right, start becomes equal to "L______RR".
Since it is possible to get the string target from start, we return true.
Example 2
Input: start = "R_L_", target = "__LR"
Output: false
Explanation: The 'R' piece in the string start can move one step to the right to obtain "_RL_".
After that, no pieces can move anymore, so it is impossible to obtain the string target from start.
Example 3
Input: start = "_R", target = "R_"
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.
Constraints
n == start.length == target.length
1 <= n <= 105
start and target consist of the characters 'L', 'R', and '_'.