Length of Last Word LeetCode solution in C++

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class Solution {
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 public:
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  int lengthOfLastWord(string s) {
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    int count = 0;
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    int n = s.size();
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    int i = n - 1;
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    while (i >= 0) {
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      if (s[i] == ' ') {
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        i--;
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        if (count > 0) {
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          break;
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        }
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      } else {
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        count++;
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        i--;
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      }
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    }
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    return count;
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  }
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};