1 #include<bits/stdc++.h>
2 using namespace
std;
3 int n,e;
4 vector<int>g[128];
5 bool seen[128];
6
7 void dfs(int u){
8 seen[u] = true;
9 cout<<u<<" ";
10 for(int i=0;i<g[u].size();i++){
11 int v = g[u][i];
12 if(!seen[v])dfs(v);
13 printf("\n");
14 }
15
16 }
17 int main(){
18 cin>>n>>e;
19 for(int i=0;i<n;i++){
20 int u,v;
21 cin>>u>>v;
22 g[u].push_back(v);
23 }
24 for(int i = 1;i<=n;i++ ){
25 if(!seen[i]){
26 dfs(i);
27 }
28 }
29
30 return 0;}
