Goat Latin LeetCode solution in C++

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class Solution {
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 public:
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  string toGoatLatin(string sentence) {
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    sentence += ' ';
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    vector<string> Words;
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    string TEMP, SOL, A = "a";
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    for (int i = 0; i < sentence.size(); ++i) {
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      if (sentence[i] == ' ') {
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        Words.push_back(TEMP);
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        TEMP = "";
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      } else
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        TEMP += sentence[i];
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    }
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    for (string V : Words) {
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      char TMP = tolower(V[0]);
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      if (TMP == 'a' || TMP == 'e' || TMP == 'i' || TMP == 'o' || TMP == 'u')
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        V += "ma";
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      else {
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        TMP = V[0];
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        V.erase(0, 1);
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        V += TMP;
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        V += "ma";
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      }
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      V += A;
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      A += 'a';
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      SOL += V + ' ';
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    }
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    SOL.erase(SOL.size() - 1, 1);
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    return SOL;
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  }
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};