Count Prefixes of a Given String LeetCode solution in C++

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class Solution {
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 public:
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  int countPrefixes(vector<string> &words, string s) {
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    int res = words.size();
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    for (auto &&word : words) {
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      for (int i = 0; i < word.size(); i++) {
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        if (s[i] != word[i]) {
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          res--;
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          break;
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        }
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      }
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    }
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    return res;
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  }
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};