Use a hashmap

from collections import defaultdict
class Solution:
  def isAnagram(self, s, t):
    # TODO: Write your code here
    counter = defaultdict(int)
    for c in s:
      counter[c] += 1
    for c in t:
      if c in counter:
        counter[t] -= 1
      else:
        return False
    
    return sum(counter.values()) == 0