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  1. #include <iostream>
  2. #include <vector>
  3. #include <stack>
  4. #include <utility>
  5. using namespace std;
  6.  
  7. void rundfs(const vector<vector<int> >& graph, const int max) {
  8. vector<bool> visited(max);
  9. stack<pair<bool,int>> dfs;
  10. stack<int> postOrder;
  11. for(int i=0 ; i < max ; i++){
  12.     if(!visited[i]){
  13.         dfs.push(make_pair(false,i));
  14.     }   
  15.     while(!dfs.empty()){
  16.         pair<bool,int> node=dfs.top();
  17.         dfs.pop();
  18.         if (node.first) {
  19.         	cout << node.second << endl;
  20.             postOrder.push(node.second);
  21.             continue;
  22.         }
  23.         if (visited[node.second]) {
  24.         	continue;
  25.         }
  26.         visited[node.second]=true;
  27.         dfs.push(make_pair(true, node.second));
  28.         const auto& newVec=graph[node.second]; //vector of neighboors
  29.         for(const auto son: newVec){
  30.             if(!visited[son]){
  31.                 dfs.push(make_pair(false, son));
  32.             }
  33.         }
  34.     }
  35. }
  36.  
  37. }
  38.  
  39. int main() {
  40. 	rundfs({ {1, 3},   {2},   {},   {2}}, 4);
  41. 	return 0;
  42. }
  43.  
Success #stdin #stdout 0s 5268KB
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https://ideone.com/9DAIWn
language:
C++14 (gcc 8.3)
created:
19 hours ago
visibility:
public

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