《传球传出了4个TLE》

#include<bits/stdc++.h>
using namespace std;
long long tot;
unsigned short n,m;
void dfs(unsigned short c=1,unsigned short step=0)
{
	if(c==1&&step==m)
	{
		tot++;
		return;
	}
	if(step==m) return;
	else
	{
		if(c==1)
		{
			dfs(c+1,step+1);
			dfs(n,step+1);
		}
		else if(c==n)
		{
			dfs(c-1,step+1);
			dfs(1,step+1);
		}
		else
		{
			dfs(c-1,step+1);
			dfs(c+1,step+1);
		}
	}
}
int main()
{
	scanf("%hu%hu",&n,&m);
	dfs();
	printf("%lld\n",tot);
	return 0;
}