@[12468C](/user/552088) 把maxn调大点，我改成100，过了
by Loser_Syx @ 2023-01-31 10:35:45
@[Saint_ying_xtf](/user/852144)
[调大后...](https://www.luogu.com.cn/record/100924980)
by 12468C @ 2023-01-31 10:46:03
@[12468C](/user/552088) 自己看
```cpp
#include<bits/stdc++.h>
using namespace std;
const int maxn=100;
int dis[maxn][maxn];
int s1[maxn][maxn][35];
int n,m;
int main(){
memset(dis,0x3f,sizeof(dis));
memset(s1,0,sizeof(s1));
cin>>n>>m;
for(int i=1;i<=m;i++){
int t1,t2;
cin>>t1>>t2;
if(t1==t2){
dis[t1][t2]=0;
}
else{
dis[t1][t2]=1;
}
s1[t1][t2][0]=1;
}
for(int k=0;k<32;k++){
for(int kk=1;kk<=n;kk++){
for(int i=1;i<=n;i++){
for(int j=1;j<=n;j++){
if(s1[i][kk][k]==1&&s1[kk][j][k]==1){
s1[i][j][k+1]=1;
if(i==j){
dis[i][j]=0;
}
else{
dis[i][j]=1;
}
}
}
}
}
}
for(int k=1;k<=n;k++){
for(int i=1;i<=n;i++){
for(int j=1;j<=n;j++){
dis[i][j]=min(dis[i][j],dis[i][k]+dis[k][j]);
}
}
}
cout<<dis[1][n];
return 0;
}
```
by Loser_Syx @ 2023-01-31 10:47:24
@[Saint_ying_xtf](/user/852144)
谢谢dalao，[已A掉](https://www.luogu.com.cn/record/100925670)
by 12468C @ 2023-01-31 10:50:14