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  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. 		Scanner sc = new Scanner(System.in);
  13. 		int n = sc.nextInt();
  14. 		int m = sc.nextInt();
  15. 		List<List<Integer>> adj = new ArrayList<>();
  16. 		for(int i=0; i<=n;i++){
  17. 			adj.add(new ArrayList<>());
  18. 		}
  19.  
  20. 		for(int i=0; i<m; i++){
  21. 			int u = sc.nextInt();
  22. 			int v = sc.nextInt();
  23. 			adj.get(u).add(v);
  24. 			adj.get(v).add(u);
  25. 		}
  26. 		int ans = -1;
  27. 		for(int i=1;i<n;i++){
  28. 			if(adj.get(i).size()==1){
  29. 				ans = i;
  30. 			}
  31. 		}
  32. 		System.out.println(ans);
  33.  
  34. 	}
  35. }
Success #stdin #stdout 0.1s 56508KB
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https://ideone.com/rHjEh0
language:
Java (HotSpot 12)
created:
2 days ago
visibility:
public

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