Number of Good Ways to Split a String LeetCode solution in Java

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class Solution {
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  public int numSplits(String s) {
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    int a[] = new int[26];
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    int b[] = new int[26];
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    int ds1 = 0, ds2 = 0;
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    int count = 0;
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    for (int i = 0; i < s.length(); i++) {
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      b[s.charAt(i) - 97]++;
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      if (b[s.charAt(i) - 97] == 1) ds2++;
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    }
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    for (int i = 0; i < s.length(); i++) {
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      a[s.charAt(i) - 97]++;
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      b[s.charAt(i) - 97]--;
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      if (b[s.charAt(i) - 97] == 0) ds2--;
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      if (a[s.charAt(i) - 97] == 1) ds1++;
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      if (ds1 == ds2) count++;
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    }
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    return count;
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  }
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}