【BZOJ 4713】迷失的字符串






#define LL long long
using namespace std;

const int M = 16;
const int SGZ = 26;
const int N = 30000+9;

int head[N],nxt[N<<1],to[N<<1],col[N<<1],sz[N],hvy[N];
int n,m,tot,beg[N],ed[N],id[N],pool[M],top; char s[N];
bitset<N> vout,ans,ve,vis[SGZ],vs[SGZ],f[M],g[M];

inline int read() {
	char c=getchar(); int f=1,ret=0;
	while (c<'0'||c>'9') {if(c=='-')f=-1;c=getchar();}
	while (c<='9'&&c>='0') {ret=ret*10+c-'0';c=getchar();}
	return ret * f;

inline void Add_Edge(int u, int v, int c) {
	static int E = 1;
	to[++E] = v; nxt[E] = head[u]; head[u] = E; col[E] = c;
	to[++E] = u; nxt[E] = head[v]; head[v] = E; col[E] = c;

void DFS1(int w, int f) {
	sz[w] = 1;
	for (int i=head[w];i;i=nxt[i]) {
		if (to[i] != f) {
			DFS1(to[i], w);
			sz[w] += sz[to[i]];
			if (sz[hvy[w]]<sz[to[i]]) 
				hvy[w] = to[i];

inline void init(int w) {
	id[w] = pool[top--];
	g[id[w]] = ve;	

inline void solve(int x, int y, int c) {
	int ix = id[x], iy = id[y];
	f[iy] <<= 1; f[iy] &= vis; f[iy] |= vs;
	g[iy] = g[iy] & vis;
	vout |= g[iy];
	g[iy] >>= 1;
	ans |= f[ix] & g[iy];
	ans |= g[ix] & f[iy];
	f[ix] |= f[iy];
	g[ix] |= g[iy];
	pool[++top] = iy;

void DFS2(int w, int f) {
	if (hvy[w]) DFS2(hvy[w], w);
	for (int i=head[w];i;i=nxt[i]) if (to[i] == hvy[w]) 
		solve(w, hvy[w], col[i]);
	for (int i=head[w];i;i=nxt[i]) if (to[i] != hvy[w] && to[i] != f) 
		DFS2(to[i], w), solve(w, to[i], col[i]);

int main() {
	for (int i=top=M-1;~i;i--) pool[i] = i;
	for (int i=n=read(),u,v;i>1;i--) {
		u = read(); v = read(); 
		Add_Edge(u, v, s[0]-'a');
	for (int i=m=read(),len;i;i--) {
		scanf("%s",s); len = strlen(s); 
		vs[s[0]-'a'][beg[m-i+1]=tot+1] = 1; 
		for (int j=0;j<len;j++) vis[s[j]-'a'][++tot] = 1;
		ve[ed[m-i+1]=tot] = 1; 
	DFS1(1, 1); 
	DFS2(1, 1);
	for (int i=1,tag=0;i<=m;i++,tag=0) {
		if (vout[beg[i]]) tag = 1;
		for (int j=beg[i];j<=ed[i]&&!tag;j++) if (ans[j]) tag = 1;
	return 0;


不过想不起怎么做了 _(:з」∠)_
会的神犇可不可以给我讲一讲怎么做啊 QwQ

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