rt，关于官方英文题解中：

there are at most $\frac{H(H+1)W(W+1)}{4}$ possible numbers of strawberries on a piece.

为什么每一块最多有 $\frac{H(H+1)W(W+1)}{4}$ 个草莓。

以及：

For $N=6$, this exceeds $10^{10}$, but the constant factor is small enough, so it is sufficiently fast.

这常数要多小才能跑过 1e10……