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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Graph
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9. 		int ii = 0, k = 0;
  10. 		Boolean p = true;
  11. 		Scanner in = new Scanner(System.in);
  12. 		int n = in.nextInt();
  13. 		int m = in.nextInt();
  14. 		int[] v = new int[m], g = new int[m];
  15. 		for (int i = 0; i < m; i ++)
  16. 		{
  17. 			v[i] = in.nextInt();
  18. 			g[i] = in.nextInt();
  19. 		}
  20. 		while (p)
  21. 		{
  22. 			for (int j = ii+1; j < m; j ++)
  23. 			{
  24. 				if ((v[ii] == v[j]) && (g[ii] == g[j])) 
  25. 				{ 
  26. 					k++; 
  27. 					System.out.println("YES"); 
  28. 					p=false; //Выход из цикла.
  29. 				}
  30. 			}
  31. 			ii ++;
  32. 			if (ii == m) break; //Условие окончания цикла.
  33. 		}
  34. 		if (k == 0) System.out.println("NO"); 
  35. 	}
  36. }
Success #stdin #stdout 0.15s 321344KB
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stdin
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3 4
1 2
2 3
1 3
2 3
stdout
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YES
https://ideone.com/lBNcUM
language:
Java (12.0.1)
created:
8 years ago
visibility:
secret

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