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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.math.*;
  4. import java.io.*;
  5.  
  6. import static java.lang.Math.*;
  7. import static java.util.Arrays.*;
  8.  
  9. public class A{
  10. 	Scanner sc=new Scanner(System.in);
  11.  
  12. 	int INF=1<<28;
  13. 	double EPS=1e-9;
  14.  
  15. 	int n;
  16. 	int[] p;
  17.  
  18. 	void run(){
  19. 		n=sc.nextInt();
  20. 		p=new int[n];
  21. 		for(int i=0; i<n; i++){
  22. 			p[i]=sc.nextInt();
  23. 			if(p[i]>0){
  24. 				p[i]--;
  25. 			}
  26. 		}
  27. 		int ans=0;
  28. 		for(int i=0; i<n; i++){
  29. 			int c=0;
  30. 			for(int v=i; v>=0; v=p[v]){
  31. 				c++;
  32. 			}
  33. 			ans=max(ans, c);
  34. 		}
  35. 		println(ans+"");
  36. 	}
  37.  
  38. 	void println(String s){
  39. 		System.out.println(s);
  40. 	}
  41.  
  42. 	void print(String s){
  43. 		System.out.print(s);
  44. 	}
  45.  
  46. 	void debug(Object... os){
  47. 		System.err.println(Arrays.deepToString(os));
  48. 	}
  49.  
  50. 	public static void main(String[] args){
  51. 		new A().run();
  52. 	}
  53. }
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https://ideone.com/Sroyo
language:
Java (HotSpot 12)
created:
13 years ago
visibility:
public

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