Python 3 - O(n) - Faster than 98.39%, Memory usage less than 100%
\nclass Solution:\n    def isAnagram(self, s: str, t: str) -> bool:\n        tracker = collections.defaultdict(int)\n        for x in s: tracker[x] += 1\n      
```\nclass Solution:\n    def isAnagram(self, s: str, t: str) -> bool:\n        tracker = collections.defaultdict(int)\n        for x in s: tracker[x] += 1\n        for x in t: tracker[x] -= 1\n        return all(x == 0 for x in tracker.values())\n```
['Python', 'Python3']