代码

#pragma GCC optimize("Ofast")
#pragma GCC target("avx2,popcnt,bmi,bmi2")
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