{
　unsigned i, j, k, index;
　srand(time(0));
　for (i = 0; i < (unsigned)-1; i++)
　for (j = 0; j < (unsigned)-1; j++)
　for (k = 0; k < (unsigned)-1; k++) {
　　index = rand() % size;
　　if (a[index] == Key)
　　return
　}
　return -1;
}