Longest Palindrome LeetCode solution in C++

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class Solution {
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 public:
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  int longestPalindrome(string s) {
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    map<char, int> mp;
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    for (int i = 0; i < s.length(); i++) {
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      mp[s[i]]++;
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    }
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    int ans = 0;
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    int odd = 0;
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    for (auto i : mp) {
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      if (i.second % 2 == 1) {
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        odd = 1;
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      }
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      ans = ans + (i.second / 2) * 2;
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    }
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    return ans + odd;
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  }
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};