Duplicate Zeros LeetCode solution in C++

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class Solution {
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 public:
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  void duplicateZeros(vector<int> &arr) {
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    for (int i = 0; i < arr.size(); i++) {
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      if (arr[i] == 0) {
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        arr.pop_back();
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        arr.insert(arr.begin() + i, 0);
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        i++;
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      }
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    }
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  }
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};