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  1. #include <bits/stdc++.h> 
  2.  
  3. using namespace std;  
  4.  
  5. typedef long long ll;  
  6. typedef pair<int, int> ii;  
  7.  
  8. const int INF = 1e9;  
  9. const ll LINF = 1e18;  
  10.  
  11. const int N = 1e5 + 5; 
  12. const int M = 1e5 + 5; 
  13. const int Q = 1e5 + 5; 
  14.  
  15. // Duyệt ngược truy vấn => chuyển từ thao tác xoá cạnh thành thao tác thêm cạnh 
  16.  
  17. struct Edge {
  18. 	int u, v;  
  19. }; 
  20.  
  21. int n, m, q;   
  22. vector<Edge> edges; 
  23. vector<int> queries;  
  24.  
  25. int p[N], sz[N]; 
  26.  
  27. void initSet() {
  28. 	for (int u = 1; u <= n; u++) {
  29. 		p[u] = u;  
  30. 		sz[u] = 1; 
  31. 	}
  32. }
  33.  
  34. int findSet(int u) {
  35. 	if (p[u] == u) return u;  
  36. 	return p[u] = findSet(p[u]); 
  37. }
  38.  
  39. bool unionSet(int u, int v) {
  40. 	u = findSet(u); 
  41. 	v = findSet(v); 
  42. 	if (u == v) return false; 
  43. 	if (sz[u] < sz[v]) swap(u, v); 
  44. 	p[v] = u; 
  45. 	sz[u] += sz[v]; 
  46. 	return true; 
  47. }
  48.  
  49. bool marked[M]; 
  50. int ans[Q];
  51.  
  52. int main() {
  53. 	ios::sync_with_stdio(false); 
  54. 	cin.tie(nullptr); 	
  55. 	cin >> n >> m >> q;  
  56.  
  57. 	for (int i = 0; i < m; i++) {
  58. 		int u, v; 
  59. 		cin >> u >> v; 
  60. 		edges.push_back({u, v}); 
  61. 	}
  62.  
  63. 	for (int i = 0; i < q; i++) {
  64. 		int id; cin >> id;  
  65. 		--id;  
  66. 		marked[id] = true; 
  67. 		queries.push_back(id); 
  68. 	}
  69.  
  70. 	initSet();   
  71.  
  72. 	int num_cc = n; // Số thành phần liên thông
  73. 	for (int i = 0; i < m; i++) {
  74. 		if (marked[i]) continue; 
  75. 		Edge e = edges[i]; 
  76. 		num_cc -= unionSet(e.u, e.v); 
  77. 	}
  78.  
  79. 	for (int i = q - 1; i >= 0; i--) {
  80. 		ans[i] = num_cc;  
  81. 		int id = queries[i]; 
  82. 		Edge e = edges[id]; 
  83. 		num_cc -= unionSet(e.u, e.v); 
  84. 	}
  85.  
  86. 	for (int i = 0; i < q; i++) cout << ans[i] << '\n'; 
  87. }
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/hdP1qo
language:
C++14 (gcc 8.3)
created:
312 days ago
visibility:
secret

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