@[ice_moon_soul](/user/1068299) 建议你像这样写吧
```cpp
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
const int N = 1e3 + 5;
const int mod = 1e9 + 7;
int vi[305][305];
bool b[305][305];
int px[4]={-1,1,0,0},py[4]={0,0,-1,1};
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
int m;
memset(vi,0x3f,sizeof(vi));
cin>>m;
while(m--)
{
int x,y,t;
cin>>x>>y>>t;
vi[x][y]=min(vi[x][y],t);
for(int i=0;i<4;i++)
{
int xx=x+px[i],yy=y+py[i];
if(xx>=0&&yy>=0)
vi[xx][yy]=min(vi[xx][yy],t);
}
}
queue<pair<pair<int,int>,int>> q;
q.push(make_pair(make_pair(0,0),0));
while(!q.empty())
{
pair<pair<int,int>,int> tmp=q.front();
q.pop();
int x=tmp.first.first,y=tmp.first.second;
b[x][y]=true;
if(vi[x][y]>1e6)
{
cout<<tmp.second;
return 0;
}
for(int i=0;i<4;i++)
{
int xx=x+px[i],yy=y+py[i];
if(xx>=0&&yy>=0&&tmp.second+1<vi[xx][yy]&&!b[xx][yy])
q.push(make_pair(make_pair(xx,yy),tmp.second+1)),b[xx][yy]=true;
}
}
cout<<-1;
return 0;
}
```
by JiHuan @ 2024-03-26 21:00:06
@[ice_moon_soul](/user/1068299) 还有就是流星的爆炸范围可以到301
by JiHuan @ 2024-03-26 21:05:34