好像还是因为多测没完全清空……
放上AC代码警示后人：
```C++
#include <bits/stdc++.h>
using namespace std;
const int M = 50010;
int top[M],vis[M];
int ht,et,tot; bool flag;
queue<int>q;
struct hh{
long long x,y,z;
}hole[M];
struct edge{
int nxt = 0,to;
}e[M]; int head[M];
void bfs(){
while(!q.empty()){
int now = q.front(); q.pop();
// cout<<now<<endl;
if(top[now]){
// cout<<now<<endl;
flag = 1;
return;
}
for(int i=head[now];i;i=e[i].nxt){
int tt = e[i].to;
if(!vis[tt]){
vis[tt] = 1;
q.push(tt);
}
}
}
return;
}
long long pp(int a){
return (long long)a*(long long)a;
}
long long dist(hh a,hh b){
int xa = a.x, xb = b.x, ya = a.y, yb = b.y, za = a.z, zb = b.z;
return(pp(xa-xb)+pp(ya-yb)+pp(za-zb));
}
void add(int f,int t){
e[++et].to = t;
e[et].nxt = head[f];
head[f] = et;
}
signed main(){
ios::sync_with_stdio(false);
freopen("cheese52.in","r",stdin);
freopen("cheese5.out","w",stdout);
int t;
cin>>t;
while(t--){
ht = 0; et = 0; tot = 0; flag = false;
while(!q.empty())q.pop(); //被这个玩意卡40pts
memset(vis,0,sizeof(vis));
memset(head,0,sizeof(head));
memset(top,0,sizeof(top));
int n,h,r;
cin>>n>>h>>r;
for(int i=1;i<=n;i++){
long long x,y,z;
cin>>x>>y>>z;
hole[++ht].x=x; hole[ht].y=y, hole[ht].z=z;
if(hole[ht].z<=r){
vis[ht]=1;
q.push(ht);
}
if(hole[ht].z+r>=h){
top[ht] = 1;
}
}
for(int i=1;i<=n;i++){
for(int j=i+1;j<=n;j++){
if(dist(hole[i],hole[j])<=pp(2*r)){
// cout<<i<<" "<<j<<endl;
add(i,j);
add(j,i);
}
}
}
bfs();
if(flag){
cout<<"Yes"<<endl;
}else{
cout<<"No"<<endl;
}
}
return 0;
}
```
by 十八子 @ 2022-10-27 14:09:20