RT，对着代码盯了1小时了，还是错qwq

#include<iostream>
#include<vector>
#include<queue>
#include<algorithm>
using namespace std;
typedef long long ll;
vector<ll> v[100001];
ll n,m;
ll use[100001];
void dfs(ll x){
    use[x]=1;
    cout<<x<<" ";
    for(ll i=0;i<v[x].size();i++){
        ll y=v[x][i];
        if(not use[y])dfs(y);
    }
}
void bfs(ll x){
    queue<ll> q;
    q.push(x);
    use[x]=1;
    fill(use,use+100001,0);
    while(q.size()){
        ll tp=q.front();cout<<tp<<" ";
        q.pop();
        for(ll i=0;i<v[tp].size();i++){
            ll y=v[tp][i];
            if(not use[y]){
                use[y]=1;
                q.push(y);
            }
        }
    }
}
int main(){
    cin>>n>>m;
    for(ll i=0;i<m;i++){
        ll x,y;cin>>x>>y;
        v[x].push_back(y);
    }
    for(ll i=1;i<=n;i++)sort(v[i].begin(),v[i].end());
    dfs(1);
    cout<<endl;
    fill(use,use+100001,0);
    bfs(1);
    return 0;
}