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class Solution {
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 public:
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  bool uniqueOccurrences(vector<int> &arr) {
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    unordered_map<int, int> sk;
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    unordered_map<int, int> skk;
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    for (int i = 0; i < arr.size(); i++) {
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      sk[arr[i]]++;
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    }
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    for (auto j : sk) {
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      if (skk[j.second] == 1) {
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        return false;
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      }
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      skk[j.second]++;
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    }
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    return true;
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  }
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};