Submission #1836667

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Source Code Expand

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<algorithm>

using namespace std;

inline int read()
{
	int x=0;char ch=getchar();
	while(ch<'0' || '9'<ch)ch=getchar();
	while('0'<=ch && ch<='9')x=x*10+(ch^48),ch=getchar();
	return x;
}

typedef long long ll;
const int N=400009;
const ll md=924844033;

int n,m,l;
int to[N<<1],nxt[N<<1],beg[N],tot;
int rev[N<<1],siz[N];
ll a[N<<1],b[N<<1],fac[N],inv[N];

inline void chk(ll &a){if(a<0)a+=md;}

inline ll qpow(ll a,ll b)
{
	ll ret=1ll;
	while(b)
	{
		if(b&1ll)
			ret=ret*a%md;
		a=a*a%md;
		b>>=1;
	}
	return ret;
}

inline void add(int u,int v)
{
	to[++tot]=v;
	nxt[tot]=beg[u];
	beg[u]=tot;
}

inline void dfs(int u,int fa)
{
	a[n]++;siz[u]=1;
	for(int i=beg[u];i;i=nxt[i])
		if(to[i]!=fa)
		{
			dfs(to[i],u);
			siz[u]+=siz[to[i]];
			chk(--a[siz[to[i]]]);
		}
	chk(--a[n-siz[u]]);
}

inline void NTT(ll *a,int n,bool f)
{
	for(int i=0;i<n;i++)
		if(i<rev[i])
			swap(a[i],a[rev[i]]);
	for(int h=2;h<=n;h<<=1)
	{
		ll w=qpow(5,(md-1)/h);
		if(f)w=qpow(w,md-2);
		for(int j=0;j<n;j+=h)
		{
			ll wn=1;
			for(int k=j;k<j+(h>>1);k++)
			{
				ll x=a[k],y=wn*a[k+(h>>1)]%md;
				a[k]=(x+y)%md;
				a[k+(h>>1)]=(x-y+md)%md;
				wn=wn*w%md;
			}
		}
	}

	if(f)
		for(ll i=0,invn=qpow(n,md-2);i<n;i++)
			a[i]=a[i]*invn%md;
}

inline void init()
{
	fac[0]=1;
	for(ll i=1;i<N;i++)
		fac[i]=fac[i-1]*i%md;
	inv[N-1]=qpow(fac[N-1],md-2);
	for(ll i=N-1;i>=1;i--)
		inv[i-1]=inv[i]*i%md;
}

int main()
{
	if(fopen("vj.in","r"))
	{
		freopen("vj.in","r",stdin);
		freopen("vj.out","w",stdout);
	}

	init();
	n=read();
	for(int i=1,u,v;i<n;i++)
	{
		u=read();v=read();
		add(u,v);add(v,u);
	}
	dfs(1,1);

	for(int i=1;i<=n;i++)
		a[i]=a[i]*fac[i]%md;
	for(int i=1;i<=n;i++)
		b[i]=inv[n-i];

	for(m=1,l=0;m<=(n<<1);m<<=1)l++;
	for(int i=0;i<m;i++)
		rev[i]=(rev[i>>1]>>1)|((i&1)<<(l-1));

	NTT(a,m,0);NTT(b,m,0);
	for(int i=0;i<m;i++)
		a[i]=a[i]*b[i]%md;
	NTT(a,m,1);

	for(int i=1;i<=n;i++)
		printf("%lld\n",a[n+i]*inv[i]%md);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:102:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
   freopen("vj.in","r",stdin);
                             ^
./Main.cpp:103:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result]
   freopen("vj.out","w",stdout);
                               ^

Judge Result