Binary search return index c++

int binarySearch(vector<int>& arr, int p, int r, int num) {
        while (p <= r) {
            int mid = (p + r)/2;
            
            if (arr[mid] == num) return mid;
            else if (arr[mid] > num) r = mid-1;
            else  p = mid+1;
        }
        return -1;
    }

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