Maximum Score After Splitting a String LeetCode solution in C++

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class Solution {
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 public:
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  int maxScore(string s) {
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    int ones = 0;
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    int res = -s.length();
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    for (int i = 0; i < s.length() - 1; i++) {
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      if (s[i] == '1') ones += 2;
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      if (i - ones > res) res = i - ones;
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    };
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    ones >>= 1;
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    if (s[s.length() - 1] == '1') ones++;
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    return ones + res + 1;
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  }
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};