(i)表达的是i不为0即为真点击查看代码#include<iostream>usingnamespacestd;constintmod=1000000007;longlongf[305][305][305][3];longlongg[305][305][305];longlongh[305][305][305];intsum[305];longlongH(inti,intj,intk){if(i>=0&&