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  1. #include <stdio.h>
  2. #include <stdbool.h>
  3.  
  4. #define MAXV 10005
  5. #define MAXE 200005
  6.  
  7. int head[MAXV]; 
  8. int to[MAXE];
  9. int next_edge[MAXE];
  10. int edge_id[MAXE];
  11. int edge_count = 0;
  12.  
  13. bool used_edge[MAXE / 2];
  14. int degree[MAXV];
  15. int circuit[MAXE];
  16. int circuit_size = 0;
  17.  
  18. void add_edge(int u, int v, int id) {
  19.     to[edge_count] = v;
  20.     edge_id[edge_count] = id;
  21.     next_edge[edge_count] = head[u];
  22.     head[u] = edge_count++;
  23.     degree[u]++;
  24. }
  25.  
  26. void find_circuit(int u) {
  27.     while (head[u] != -1) {
  28.         int i = head[u];
  29.         head[u] = next_edge[i];
  30.  
  31.         int id = edge_id[i];
  32.         if (used_edge[id]) continue;
  33.  
  34.         used_edge[id] = true;
  35.         find_circuit(to[i]);
  36.     }
  37.     circuit[circuit_size++] = u;
  38. }
  39.  
  40. int main() {
  41.     int n, m;
  42.     printf("Nhap so dinh va so canh: ");
  43.     if (scanf("%d %d", &n, &m) != 2) return 0;
  44.  
  45.     for (int i = 0; i < n; i++) {
  46.         head[i] = -1;
  47.         degree[i] = 0;
  48.     }
  49.  
  50.     printf("Nhap cac canh (u v):\n");
  51.     for (int i = 0; i < m; i++) {
  52.         int u, v;
  53.         scanf("%d %d", &u, &v);
  54.         add_edge(u, v, i);
  55.         add_edge(v, u, i);
  56.     }
  57.  
  58.     int start_node = -1;
  59.     for (int i = 0; i < n; i++) {
  60.         if (degree[i] % 2 != 0) {
  61.             printf("Khong co chu trinh Euler).\n", i);
  62.             return 0;
  63.         }
  64.         if (degree[i] > 0 && start_node == -1) start_node = i;
  65.     }
  66.  
  67.     if (m > 0 && start_node == -1) return 0;
  68.     if (m == 0) { printf("0\n"); return 0; }
  69.  
  70.     find_circuit(start_node);
  71.  
  72.     if (circuit_size != m + 1) {
  73.         printf("Do thi khong lien thong.\n");
  74.     } else {
  75.         printf("Chu trinh Euler: ");
  76.         for (int i = circuit_size - 1; i >= 0; i--) {
  77.             printf("%d%s", circuit[i], (i == 0 ? "" : " -> "));
  78.         }
  79.         printf("\n");
  80.     }
  81.  
  82.     return 0;
  83. }
  84.  
Success #stdin #stdout 0s 5316KB
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Nhap so dinh va so canh:
https://ideone.com/wmiuU6
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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