#include<bits/stdc++.h>
#define N 100010
using namespace std;
int read()
{
int x = 0,f = 1;
char c = getchar();
while(c<'0' || c>'9')
{
if(c=='-') f = -1;
c = getchar();
}
while(c>='0' && c<='9')
{
x = (x<<3)+(x<<1)+(c^48);
c = getchar();
}
return x*f;
}
vector <int> g[N];
int n,m;
bool f[N];
void dfs(int u)
{
cout << u << " ";
if (f[u]) return ;
f[u] = true;
for (int i=0;i<g[u].size();i++)
if (!f[g[u][i]]) dfs(g[u][i]);
}
void bfs(int u)
{
queue <int> q;
q.push(u);
while(!q.empty())
{
int x=q.front();
q.pop();
cout << x << " ";
for (int i=0;i<g[x].size();i++)
if (!f[g[x][i]])
{
q.push(g[x][i]);
f[g[x][i]] = true;
}
}
}
int main()
{
n=read(),m=read();
for (int i=1;i<=m;i++)
{
int u=read(),v=read();
g[u].push_back(v);
}
for(int i=1;i<=n;i++)
sort(g[i].begin(),g[i].end());
dfs(1);
cout << endl;
memset(f,false,sizeof(f));
bfs(1);
cout << endl;
return 0;
}
样例过了,#1 AC,其他 WA。