Merge Strings Alternately LeetCode solution in C++

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class Solution {
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 public:
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  string mergeAlternately(string word1, string word2) {
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    string final = "";
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    int p = word1.size();
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    int q = word2.size();
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    int n = max(p, q);
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    for (int i = 0; i < n; i++) {
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      if (p) {
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        final = final + word1[i];
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        p--;
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      }
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      if (q) {
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        final = final + word2[i];
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        q--;
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      }
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    }
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    return final;
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  }
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};