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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. struct Graph {
  5.   int n, m;
  6.   vector<int> head, next;
  7.   vector<int> src, dst;
  8.   Graph(int n) : n(n), m(0), head(n,-1) { }
  9.   int addEdge(int u, int v) {
  10.     next.push_back(head[u]);
  11.     src.push_back(u);
  12.     dst.push_back(v);
  13.     return head[u] = m++;
  14.   }
  15. };
  16. void dfs(Graph g) {
  17.   vector<int> visited(g.n);
  18.   function<void(int)> rec = [&](int u) {
  19.     cout << u << endl;
  20.     visited[u] = true;
  21.     int e = g.head[u];
  22.     while (e >= 0) {
  23.       if (!visited[g.dst[e]]) rec(g.dst[e]);
  24.       e = g.next[e];
  25.     }
  26.   };
  27.   rec(0);
  28. }
  29.  
  30. int main() {
  31.   Graph g(3);
  32.   g.addEdge(0,1);
  33.   g.addEdge(1,2);
  34.   g.addEdge(2,0);
  35.   dfs(g);
  36. }
  37.  
Success #stdin #stdout 0s 4492KB
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https://ideone.com/DH9Syw
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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