int dawajTrojki(int arr[], int size){
    int count = 0;
    if(size<3) {
        return -1;
    }

    for(int i=2; i<size; i++){
        float avg = (arr[i-2]+arr[i])/2;
        if(fabs(avg)-arr[i-1] < 1) {
            count++;
        }
    }

    return count;
}