int z1(int array_start[], int* array_end, unsigned int n) {
    unsigned int index = n;
    for(int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if ((array_start[i] + array_end[j])%10 == 0) {
                array_end[j] = 10;
                array_start[i] = 0;
                index--;
                break;
            }
        }
    }

    int* tempArr = new int[n];
    int diffInd = 0;

    for(int i = 0; i < n; i++) {
        if (array_end[i] == 10) {
            diffInd++;
        }
        else
            (tempArr[i-diffInd] = array_end[i]);
    }

    delete[] array_end;
    array_end = new int[n-diffInd];

    for(int i = 0; i < n-diffInd; i++) {
        array_end[i] = tempArr[i];
    }
    delete[] tempArr;
    return index;
}

int main() {
    unsigned int n = 10;
    int arr[10] = {1, 2, 3, 4, 5, 6, 7, 5, 3, 1};
    int* arrAll = new int[10];

    for(int i = 0; i < n; i++) {
        arrAll[i] = (i+1)%10;
    }

    std::cout << z1(arr, arrAll, n) << std::endl;

    for(int i = 0; i < z1(arr, arrAll, n); i++) {
        std::cout << arrAll[i] << " ";
    }
}