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  1. #include<bits/stdc++.h>
  2. #define Loop(i,a,b) for(int i=a;i<b;++i)
  3. #define NLoop(i,a,b) for(int i=a;i>=b;--i)
  4. #define print(arr,n,m) for(int i=0;i<n;++i) { for(int j=0;j<m;++j) cout<<arr[i][j]<<" "; cout<<endl; }
  5. #define print2(arr,n) for(int i=0;i<n;++i) { cout<<arr[i]<<" "; } cout<<endl;
  6. #define MOD 998244353
  7. using namespace std;
  8. typedef long long int ll;
  9. /* Iterative Function to calculate (x^y) in O(log y) */
  10. ll power(ll x, ll y, ll p) 
  11. { 
  12.     ll res = 1;      // Initialize result 
  13.  
  14.     x = x % p;  // Update x if it is more than or  
  15.                 // equal to p 
  16.  
  17.     while (y > 0) 
  18.     { 
  19.         // If y is odd, multiply x with result 
  20.         if (y & 1) 
  21.             res = (res*x) % p; 
  22.         y = y>>1; // y = y/2 
  23.         x = (x*x) % p;   
  24.     } 
  25.     return res; 
  26. } 
  27. vector< vector<ll> > G;
  28. ll n,m;
  29. ll mod(ll x)
  30. {
  31. 	return x%MOD;
  32. }
  33. bool isBipartite(ll s,vector<ll> &col, vector<bool> &vis, vector<ll> &co, ll last)
  34. {
  35. 	vis[s] = true;
  36. 	col[s] = last;
  37. 	++co[last];
  38. 	bool ans = true;
  39. 	for(ll i=0;i<G[s].size();++i)
  40. 	{
  41. 		ll u = G[s][i];
  42. 		if(vis[u])
  43. 		{
  44. 			if(col[u]==col[s]) ans = false;
  45. 		}
  46. 		else
  47. 		{
  48. 			ans = ans && isBipartite(u,col,vis,co,1-last);
  49. 		}
  50. 	}
  51. 	return ans;
  52. }
  53. int main()
  54. {
  55. 	ios_base::sync_with_stdio(false);
  56.     cin.tie(NULL);
  57. 	ll t;
  58. 	cin>>t;
  59. 	while(t--)
  60. 	{
  61. 		cin>>n>>m;
  62. 		G.clear();
  63. 		G.resize(n+1);
  64. 		for(ll i=0;i<m;++i)
  65. 		{
  66. 			ll a,b;
  67. 			cin>>a>>b;
  68. 			G[a].push_back(b);
  69. 			G[b].push_back(a);
  70. 		}
  71. 		vector<bool> vis(n+1);
  72. 		vector<ll> col(n+1,-1);
  73. 		ll ans = 1;
  74. 		bool fl = false;
  75. 		for(ll i=1;i<=n;++i)
  76. 		{
  77. 			if(!vis[i])
  78. 			{
  79. 				vector<ll> co(2,0);
  80. 				if(isBipartite(i,col,vis,co,0))
  81. 				{
  82. 					ans = mod(mod(ans) * mod(power(2,co[0],MOD) + power(2,co[1],MOD)));
  83. 					fl = true;
  84. 				}
  85. 			}
  86. 		}
  87. 		if(fl) cout<<mod(ans)<<endl;
  88. 		else cout<<0<<endl;	
  89. 	}			
  90. }
Runtime error #stdin #stdout 0.04s 15240KB
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https://ideone.com/jWlp4l
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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