Check If String Is a Prefix of Array LeetCode solution in C++

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class Solution {
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 public:
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  bool isPrefixString(string s, vector<string> &words) {
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    string n = "";
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    for (string str : words) {
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      for (char ch : str) {
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        n += ch;
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      }
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      if (n == s) {
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        return true;
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      }
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    }
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    return false;
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  }
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};