C. The World is a Theatre

https://codeforc.es/problemset/problem/131/C

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
//#include
using namespace std;

#define sfi(i) scanf("%d",&i)
#define sfl(i) scanf("%I64d",&i)
#define sfs(i) scanf("%s",(i))
#define pri(i) printf("%d\n",i)
#define prl(i) printf("%I64d\n",i)
#define sff(i) scanf("%lf",&i)
#define ll long long
#define ull unsigned long long
#define mem(x,y) memset(x,y,sizeof(x))
#define INF 0x3f3f3f3f
#define eps 1e-10
#define PI acos(-1.0)
#define lowbit(x) ((x)&(-x))
#define fl() printf("flag\n")
#define MOD(x) ((x%mod)+mod)%mod
#define endl '\n'
#define pb push_back
#define lson (rt<<1)
#define rson (rt<<1|1)
#define FAST_IO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0)

const int maxn=1e9+3;
const int maxm=1e6+9;
const int mod=998244353;

ll c[70][70];
void init()
{
    for(int i=0;i<=30;i++)
    {
        c[i][0]=1;
        for(int j=1;j<=i;j++)
        {
            c[i][j]=c[i-1][j-1]+c[i-1][j];
            //cout<>n>>m>>t;
    ll ans=0;
    for(int i=4;i

 

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