Check if All Characters Have Equal Number of Occurrences LeetCode solution in C++

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class Solution {
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 public:
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  bool areOccurrencesEqual(string s) {
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    unordered_map<char, int> freq;
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    for (auto c : s) freq[c]++;
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    int val = freq[s[0]];
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    for (auto [a, b] : freq)
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      if (b != val) return false;
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    return true;
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  }
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};