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  1. import java.io.*;
  2. import java.util.*;
  3.  
  4. class test
  5. {
  6.     public static void main(String args[]) throws IOException
  7.     {
  8.         InputStreamReader inp = new InputStreamReader(System.in);
  9.         BufferedReader br = new BufferedReader(inp);
  10.  
  11. 	int t = Integer.parseInt(br.readLine());
  12.  
  13. 	for(int i=0;i<t;i++)
  14. 	{
  15. 		int n = Integer.parseInt(br.readLine());
  16. 		int left[] = new int[n];
  17. 	        int right[] = new int[n];
  18. 		for(int j=0;j<n;j++)
  19. 		{
  20. 			String s[] = br.readLine().split(" ");
  21. 			int l = Integer.parseInt(s[0]);
  22. 			int r = Integer.parseInt(s[1]);
  23.  
  24. 			left[j] = l;
  25. 			right[j] = r;
  26. 		}
  27.  
  28. 		TreeMap<Integer,Integer> tm = new TreeMap<Integer,Integer>();
  29. 		for(int k=0;k<n;k++)
  30. 		{
  31. 			tm.put(right[k],left[k]);
  32. 		}
  33. 		int flag=0;
  34. 		int back=-3;
  35. 		int front=-3;
  36. 		int count=1;
  37. 		for(int key: tm.keySet())
  38. 		{
  39. 			if(flag==0)
  40. 			{	back = key;
  41. 				flag++;
  42. 			}
  43. 			else
  44. 			{
  45. 				front = key;
  46. 				if(tm.get(front)>back)
  47. 				{
  48. 					count++;
  49. 					back = front;
  50. 				}
  51.  
  52. 			}
  53. 		}
  54. 		System.out.println(count);
  55. 	}
  56.  
  57.  
  58.     }
  59.  
  60. }
Runtime error #stdin #stdout #stderr 0.08s 380160KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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Exception in thread "main" java.lang.NumberFormatException: null
	at java.lang.Integer.parseInt(Integer.java:454)
	at java.lang.Integer.parseInt(Integer.java:527)
	at test.main(Main.java:11)
https://ideone.com/LciHXD
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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