Efficient Two-Pointer Validation for Transforming start to target in Move Constraints
\n\n# Explanation:\n Describe your approach to solving the problem. \n1. Remove _ Check:\n\n    - Ensure that the sequence of L and R in both strings is identic
\n\n# Explanation:\n<!-- Describe your approach to solving the problem. -->\n1. **Remove _ Check**:\n\n    - Ensure that the sequence of L and R in both strings is identical.\n2. **Position Validation**:\n\n    - Iterate through target:\n        - For L, ensure it doesn\'t move right.\n        - For R, ensure it doesn\'t move left.\n    - Use a pointer to traverse start and verify the positions align.\n# Complexity\n- Time : $$O(n)$$\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space : $$O(n)$$\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```python3 []\nclass Solution:\n    def canChange(self, start: str, target: str) -> bool:\n        # Remove `_` and check the sequence of `L` and `R`\n        if start.replace(\'_\', \'\') != target.replace(\'_\', \'\'):\n            return False\n        \n        # Check valid moves for `L` and `R`\n        start_pos = 0\n        for i, char in enumerate(target):\n            if char == \'L\':\n                # Find the next `L` in `start`\n                while start_pos < len(start) and start[start_pos] != \'L\':\n                    start_pos += 1\n                # Invalid if no `L` or position is incorrect\n                if start_pos >= len(start) or start_pos < i:\n                    return False\n                start_pos += 1  # Move pointer forward\n            \n            elif char == \'R\':\n                # Find the next `R` in `start`\n                while start_pos < len(start) and start[start_pos] != \'R\':\n                    start_pos += 1\n                # Invalid if no `R` or position is incorrect\n                if start_pos >= len(start) or start_pos > i:\n                    return False\n                start_pos += 1  # Move pointer forward\n        \n        return True\n\n```\n# SMALL REQUEST : If you found this post even remotely helpful, be kind enough to smash a upvote. I will be grateful.I will be motivated\uD83D\uDE0A\uD83D\uDE0A
['Two Pointers', 'String Matching', 'Python3']