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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. const int NMAX = 15;
  6.  
  7. struct node {
  8.     int info;
  9.     node* next;
  10. };
  11.  
  12. node* G[NMAX];
  13. node* Gt[NMAX];
  14.  
  15. void add(node* &first, int val) {
  16.     node* p = new node;
  17.     p -> info = val;
  18.     p -> next = first;
  19.     first = p;
  20. }
  21.  
  22. void read(int& n, int& m) {
  23.     cin >> n >> m;
  24.     for (int i = 1; i <= m; ++ i) {
  25.         int x, y;
  26.         cin >> x >> y;
  27.         add(G[x], y);
  28.         add(Gt[y], x);
  29.     }
  30. }
  31.  
  32. void dfs1(int currNode, bool seen[NMAX], int stck[NMAX], int& dim) {
  33.     seen[currNode] = true;
  34.     for (node* p = G[currNode]; p; p = p -> next)
  35.         if (!seen[p -> info])
  36.             dfs1(p -> info, seen, stck, dim);
  37.     stck[++ dim] = currNode;
  38. }
  39.  
  40. void dfs2(int currNode, bool seen[NMAX], int idx) {
  41.     seen[currNode] = true;
  42.     // prelucrare nodul cnt din componenta idx
  43.     cout << currNode << " ";
  44.     for (node* p = Gt[currNode]; p; p = p -> next)
  45.         if (!seen[p -> info])
  46.             dfs2(p -> info, seen, idx);
  47. }
  48.  
  49. void solve(int n) {
  50.     bool seen[NMAX];
  51.     int stck[NMAX], dim = 0;
  52.     for (int i = 1; i <= n; ++ i)
  53.         seen[i] = false;
  54.     for (int i = 1; i <= n; ++ i)
  55.         if (!seen[i])
  56.             dfs1(i, seen, stck, dim);
  57.  
  58.     int idx = 0;
  59.     for (int i = 1; i <= n; ++ i)
  60.         seen[i] = false;
  61.     while (dim) {
  62.         if (!seen[stck[dim]]) {
  63.             ++ idx;
  64.             cout << idx << " ";
  65.             dfs2(stck[dim], seen, idx);
  66.             cout << "\n";
  67.         }
  68.         -- dim;
  69.     }
  70. }
  71.  
  72. int main() {
  73.     int n, m;
  74. 	read(n, m);
  75. 	solve(n);
  76. 	return 0;
  77. }
  78.  
Success #stdin #stdout 0s 4540KB
comments (?)
stdin 
6 7
1 2
2 1
2 3
3 4
4 5
5 6
6 4
stdout 
1 1 2 
2 3 
3 4 6 5
https://ideone.com/FM9eC8
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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