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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. 		// your code goes here
  13. 		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  14. 	   PrintWriter out = new PrintWriter(System.out,true);
  15. 	   //StringTokenizer st = new StringTokenizer(br.readLine());
  16. 	   int t = Integer.parseInt(br.readLine());
  17. 	   while(t-->0){
  18. 		   int n = Integer.parseInt(br.readLine());
  19. 		   StringTokenizer st = new StringTokenizer(br.readLine());
  20. 		   long[] a = new long[n];
  21. 		   for(int i =0;i<n;i++){
  22. 			   a[i] = Long.parseLong(st.nextToken());
  23. 		   }
  24. 		   boolean yes = true;
  25. 		  int[] mark = new int[n];
  26. 		  mark[0] = 0;
  27. 		  for(int i =0;i<n-1;i++){
  28. 		  	if(a[i]<a[i+1] && mark[i+1] == 1){
  29. 		  		yes = false;
  30. 		  		break;
  31. 		  	}
  32. 		  	else if(a[i]>a[i+1]){
  33. 		  		a[i] = a[i]^a[i+1];
  34. 		  		a[i+1] = a[i]^a[i+1];
  35. 		  		a[i] = a[i]^a[i+1];
  36. 		  		mark[i+1] = 1;
  37. 		  	}
  38. 		  }
  39. 		  for(int i =0;i<n-1;i++){
  40. 		  	if(a[i]>a[i+1]){
  41. 		  		yes = false;
  42. 		  		break;
  43. 		  	}
  44. 		  }
  45. 		  if(yes)out.println("YES");
  46. 		  else out.println("NO");
  47. 	   }
  48. 	}
  49. }
Success #stdin #stdout 0.1s 320512KB
comments (?)
stdin
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2
3
1 2 3
5
2 4 1 3 5
stdout
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YES
NO
https://ideone.com/h9x7Sv
language:
Java (12.0.1)
created:
8 years ago
visibility:
secret

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