ccf 第十九次认证 1246

#include <bits/stdc++.h>
typedef  long long ll ;
#define int ll
#define ME(x , y) memset(x , y , sizeof(x))
using namespace std ;
typedef pair<int,int> pii;
int quickpow(int a,int b,int mo){int s;for(s=1;b;b>>= 1,a=a*a%mo)if(b&1)s=s*a%mo;return s;}
#define INF 0x3f3f3f3f
const double PI = acos(-1.0);
const int maxn = 14;
const int N = 3e4+9;
const int mod = 998244353;
map<int,int>vis;
struct node{
	int a[maxn][maxn];
	node(){memset(a , 0 , sizeof(a));}
	node operator * (const node B)const{
		node C ;
		for(int i = 0 ; i < maxn ; i++){
			for(int j = 0 ; j < maxn ; j++){
				for(int k =  0 ; k < maxn ; k++){
					C.a[i][j] = (C.a[i][j] + (a[i][k] % mod * B.a[k][j] % mod) % mod) % mod;
				}
			}
		}
		return C;
	} 
};

node qpow(node a , int b){
	node c ;
	for(int i = 0 ; i < maxn ; i++){
		c.a[i][i] = 1 ;
	}
	while(b){
		if(b&1){
			c = c * a ; 
		}
		b >>= 1 ;
		a = a * a ;
	}
	return c;
}
int a[maxn][maxn] ={
	{0,0,1,0,0,0,0,0,0,0,0,0,0,0},
	{1,0,0,0,0,0,0,0,0,0,0,0,0,0},
	{0,1,0,1,0,0,0,0,0,0,0,0,0,0},
	{0,0,1,1,0,0,0,0,0,0,0,0,0,0},
	{0,0,1,0,0,0,0,0,0,0,0,0,0,0},
	{0,0,0,0,1,0,0,0,0,0,0,0,0,0},//6
	{0,0,0,0,0,0,0,0,0,0,0,1,0,0},
	{0,0,0,0,0,0,0,0,0,0,1,0,0,0},
	{0,0,0,0,0,1,0,0,0,0,0,0,1,0},
	{0,0,0,0,0,0,0,1,0,0,0,0,0,0},//10
	{0,0,0,0,0,0,1,0,0,0,0,0,0,0},
	{0,0,0,1,0,0,0,0,0,0,0,0,0,1},
	{0,0,0,0,0,0,0,0,1,0,0,0,0,0},
	{0,0,0,0,0,0,0,0,0,1,0,0,0,0},
};
map<string,int>cnt;


void Solve(){
	cnt["1"] = 0 ;cnt["2"] = 1 ;
	cnt["4"] = 2 ;cnt["6"] = 3 ;
	cnt["16"] = 4 ;cnt["26"] = 5 ;
	cnt["41"] = 6 ;cnt["44"] = 7 ;
	cnt["46"] = 8 ;cnt["61"] = 9 ;
	cnt["62"] = 10 ;cnt["64"] = 11 ;
	cnt["66"] = 12 ;cnt["42"] = 13 ;
	node A , B , C;
	for(int i = 0 ; i < 14 ; i++){
		for(int j = 0 ; j < 14 ; j++){
			A.a[i][j] = a[i][j];
		}
	}
	B.a[0][0] = 1 ;
	int n; string s;
	cin >> n >> s;
	C = qpow(A , n) * B ;
	cout << C.a[cnt[s]][0] << endl;
	
}

	
signed main(){
	#ifdef ONLINE_JUDGE
	#else
		freopen("D:\c++\in.txt", "r", stdin);
		//freopen("D:\c++\out.txt", "w", stdout);
	#endif
		Solve();
}