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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ll long long 
  5. const int N = 1e5 + 5, L = 21, M = 1e9 + 7;
  6. vector<int> g[N], st, mp(N), lev(N), par(N), vis(N), pw(N, 1);
  7. vector<int> gn[N], a(N), p(N), tin(N), tout(N);
  8. int up[N][L], tmr;
  9.  
  10. void dfs_gr(int u) {
  11. 	vis[u] = 1;
  12. 	st.push_back(u);
  13. 	for(int v : g[u]) if(v != par[u]) {
  14. 		if(not vis[v]) {
  15. 			par[v] = u;
  16. 			lev[v] = lev[u] + 1;
  17. 			dfs_gr(v);
  18. 		}
  19. 		if(vis[v] and lev[v] < lev[u]) {
  20. 			p[v] = a[v] = 1;
  21. 			int s = st.size();
  22. 			for(int i = s-1; i >= 0; i --) {
  23. 				mp[st[i]] = v;
  24. 				if(st[i] == v) {
  25. 					break;
  26. 				}
  27. 			}
  28. 		}
  29. 	}
  30. 	st.pop_back();
  31. }
  32.  
  33. void dfs_pre(int u, int par) {
  34. 	tin[u] = ++ tmr;
  35. 	up[u][0] = par;
  36. 	for(int i = 1; i < L; i ++) {
  37. 		up[u][i] = up[up[u][i-1]][i-1];
  38. 	}
  39. 	for(int v : gn[u]) if(v != par) {
  40. 		p[v] += p[u];
  41. 		dfs_pre(v, u);
  42. 	}
  43. 	tout[u] = tmr;
  44. }
  45.  
  46. bool is_anc(int u, int v) {
  47. 	return tin[u] <= tin[v] and tout[u] >= tout[v];
  48. }
  49.  
  50. int lca(int u, int v) {
  51. 	if (is_anc(u, v))
  52.         return u;
  53.     if (is_anc(v, u))
  54.         return v;
  55. 	for(int i = L-1; i >= 0; i --) {
  56. 		if(not is_anc(up[u][i], v)) {
  57. 			u = up[u][i];
  58. 		}
  59. 	}
  60. 	return up[u][0];
  61. }
  62.  
  63. int main() {
  64. 	ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
  65.  
  66. 	int n, m;
  67. 	cin >> n >> m;
  68. 	for(int i = 0; i < m; i ++) {
  69. 		int x, y;
  70. 		cin >> x >> y;
  71. 		g[x].push_back(y);
  72. 		g[y].push_back(x);
  73. 	}
  74. 	iota(mp.begin(), mp.end(), 0);
  75. 	for(int i = 1; i < N; i ++) {
  76. 		pw[i] = pw[i-1] * 2 % M;
  77. 	}
  78.  
  79. 	dfs_gr(1);
  80.  
  81. 	for(int u = 1; u <= n; u ++) {
  82. 		for(int v : g[u]) if(mp[u] != mp[v]) {
  83. 			gn[mp[u]].push_back(mp[v]);
  84. 		}
  85. 	}
  86.  
  87. 	dfs_pre(mp[1], mp[1]);
  88.  
  89. 	int k, x, y;
  90. 	cin >> k;
  91. 	while(k --) {
  92. 		cin >> x >> y;
  93. 		x = mp[x], y = mp[y];
  94. 		int l = lca(x, y), c = p[x] + p[y] - 2*p[l] + a[l];
  95. 		cout << pw[c] << endl;
  96. 	}
  97. }
Runtime error #stdin #stdout 0.04s 11612KB
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https://ideone.com/naIHsx
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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