Convert a Number to Hexadecimal LeetCode solution in C++

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class Solution {
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 public:
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  string toHex(int num) {
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    string hex = "0123456789abcdef";
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    unsigned int n = num; // to handle neg numbers
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    string ans = "";
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    if (n == 0) return "0";
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    while (n > 0) {
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      int k = n % 16;
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      ans += hex[k];
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      n /= 16;
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    }
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    reverse(ans.begin(), ans.end()); // as we stored it in the opposite order
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    return ans;
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  }
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};