```cpp
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <map>
#define REP(i,x,y) for (int i=x;i<=y;i++)
#define EDG(i,x) for (int i=h[x];i;i=e[i].next)
#define INF 0x7fffffff
using namespace std;
const int N=10005;
int n,q,cnt,sum,ans,ask,root,deep;
int h[N],dep[N],d[N],f[N],son[N],vis[N];
struct EDGE{int next,to,val;}e[N<<1];
map <int,int> _;
void ADD(int u,int v,int w){
e[++cnt]=(EDGE){h[u],v,w};
h[u]=cnt;
}
void ROOT(int u,int fa){
son[u]=1;f[u]=0;
EDG(i,u){
int v=e[i].to;
if (v==fa||vis[v]) continue;
ROOT(v,u);
son[u]+=son[v];
f[u]=max(f[u],son[v]);
}
f[u]=max(f[u],sum-son[u]);
if (f[u]<f[root]) root=u;
}
void DEEP(int u,int fa){
dep[++deep]=d[u];
EDG(i,u){
int v=e[i].to;
if (v==fa||vis[v]) continue;
d[v]=d[u]+e[i].val;
DEEP(v,u);
}
}
void CALC(int u,int fuck,int shit){
d[u]=fuck;deep=0;
DEEP(u,0);
int l,r,res=0;
REP(i,1,deep-1) REP(j,i+1,deep) _[dep[i]+dep[j]]+=shit;
}
void WORK(int u){
CALC(u,0,1);vis[u]=1;
EDG(i,u){
int v=e[i].to;
if (vis[v]) continue;
CALC(v,e[i].val,-1);
sum=son[v];root=0;
ROOT(v,root);WORK(root);
}
}
int READ(){
int x=0,f=1;char ch=getchar();
while (ch<'0'||ch>'9') if (ch=='-') f=-1,ch=getchar();
while (ch>='0'&&ch<='9') x=x*10+ch-'0',ch=getchar();
return x*f;
}
int main(){
n=READ();q=READ();
REP(i,1,n-1){
int u=READ(),v=READ(),w=READ();
ADD(u,v,w);ADD(v,u,w);
}
sum=n;f[0]=INF;
ROOT(1,0);WORK(root);
REP(i,1,q){
ask=READ();
if (_[ask]) printf("AYE\n"); else printf("NAY\n");
}
return 0;
}
```
by ｃｈｉｌｌ @ 2018-07-07 15:23:08
去掉快读就AC，真的佛了
by ｃｈｉｌｌ @ 2018-07-07 20:02:40
@[病名為愛](/space/show?uid=12191) 您的快读是错的啊
by Prurite @ 2018-07-25 15:40:37
```
while (ch<'0'||ch>'9') if (ch=='-') f=-1,ch=getchar();
```
一句很显然应改为
```
while (ch<'0'||ch>'9')
if (ch=='-') f=-1;
ch=getchar();
```
by Prurite @ 2018-07-25 15:41:25
(当然要打上大括号)
by Prurite @ 2018-07-25 15:41:57