fork download
copy 
  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13. 		Scanner sc = new Scanner(System.in);
  14.  
  15. 		int N = sc.nextInt();
  16. 		int E = sc.nextInt();
  17.  
  18. 		ArrayList<ArrayList<Integer>> ls = new ArrayList<>();
  19.  
  20. 		for(int i = 0; i <= N; i++) ls.add(new ArrayList<>());
  21.  
  22. 		for(int i = 0; i < E; i++){
  23. 			int u = sc.nextInt();
  24. 			int v = sc.nextInt();
  25. 			ls.get(u).add(v);
  26. 			ls.get(v).add(u);
  27. 		}
  28.  
  29. 		// red = 1 and green = 2
  30.  
  31. 		int red = 1;
  32. 		int green = 0;
  33.  
  34. 		Queue<Integer> q = new LinkedList<>();
  35.  
  36. 		int[] used = new int[N + 1];
  37.  
  38. 		Arrays.fill(used, 0);
  39.  
  40. 		used[1] = 1;
  41.  
  42. 		q.add(1);
  43.  
  44. 		int ans = 1;
  45.  
  46. 		while(!q.isEmpty()){
  47. 			int node = q.poll();
  48.  
  49. 			for(int child : ls.get(node)){
  50. 				if(used[child] == 0){
  51. 					if(used[node] == 1){
  52. 						used[child] = 2;
  53. 					}
  54. 					if(used[node] == 2){
  55. 						used[child] = 1;
  56. 					}
  57. 					q.add(child);
  58.  
  59. 				}else{
  60. 					if(used[node] + used[child] == 3){
  61.  
  62. 					}else{
  63. 						ans = 0;
  64. 					}
  65. 				}
  66. 			}
  67. 		}
  68.  
  69. 		System.out.print(ans);
  70. 	}
  71. }
Success #stdin #stdout 0.13s 54544KB
comments (?)
stdin
copy 
5
6
2 5
1 2
1 3
2 4
3 5
3 4
stdout
copy 
1
https://ideone.com/yriQC2
language:
Java (HotSpot 12)
created:
5 hours ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!