题目
思路
额，显然这破题打表啊！7*8打表出奇迹啊！打表代码见这玩意啊！
code:
#include<cstring>
#include<iostream>
#include<cmath>
#include<queue>
#include<algorithm>
using namespace std;
long long s[7][8]={
{
0,2,4,6,8,10,12,14},{
2,12,30,56,90,132,182,240},{
4,30,104,286,700,1598,3488,7390},{
6,56,286,1228,4862,18368,67206,240180},{
8,90,700,4862,32000,204294,1274660,7807790},{
10,132,1598,18368,204294,2228788,23896710,252488208},{
12,182,3488,67206,1274660,23896710,441524056,8056291934}};
int main()
{
int n,m;
cin>>n>>m;
if (n==0||m==0)
{
cout<<0;
return 0;
}
cout<<s[n-1][m-1];
return 0;
}