Most Common Word LeetCode solution in C++

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class Solution {
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 public:
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  string mostCommonWord(string paragraph, vector<string> &banned) {
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    string temp;
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    vector<string> words;
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    for (char c : paragraph) {
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      if (isalpha(c) && !isspace(c))
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        temp += tolower(c);
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      else {
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        if (temp.length()) words.push_back(temp);
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        temp = "";
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      }
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    }
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    if (temp.length()) words.push_back(temp);
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    map<string, int> mp;
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    for (string i : words) mp[i]++;
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    for (string i : banned) mp[i] = 0;
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    string ans;
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    int maxUsedFreq = 0;
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    for (auto i : mp) {
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      if (i.second > maxUsedFreq) {
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        ans = i.first;
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        maxUsedFreq = i.second;
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      }
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    }
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    return ans;
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  }
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};