Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold LeetCode solution in C++

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class Solution {
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 public:
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  int numOfSubarrays(vector<int> &arr, int k, int threshold) {
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    int i = 0;
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    int j = 0;
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    int sum = 0;
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    int ans = 0;
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    while (j < arr.size()) {
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      sum += arr[j];
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      if (j - i + 1 < k)
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        j++;
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      else if (j - i + 1 == k) {
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        if (sum / k >= threshold) {
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          ans++;
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        }
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        sum -= arr[i];
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        j++;
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        i++;
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      }
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    }
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    return ans;
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  }
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};