代码

void count_3d(int n, const unsigned *x, const unsigned *y, const unsigned *z, unsigned *out) {
	for (int j=0; j<n; ++j) for (int i=0; i<n; ++i) if (x[i]<x[j] && y[i]<y[j] && z[i]<z[j]) out[j]++;
}

评测结果