Number of Good Ways to Split a String (Leetcode 1525)

Problem Link: https://leetcode.com/problems/number-of-good-ways-to-split-a-string/

class Solution:
    def numSplits(self, s: str) -> int:
        
        d1={}
        d2={}
        for i in s:
            if(i not in d1):
                d1[i]=1
            else:
                d1[i]+=1
        
        ans=0
        for i in range(len(s)):
            if(d1[s[i]]==1):
                del d1[s[i]]
            else:
                d1[s[i]]-=1
            
            if(s[i] not in d2):
                d2[s[i]]=1
            else:
                d2[s[i]]+=1
                
            if(len(d1)==len(d2)):
                ans+=1
        return ans