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  1. import java.io.BufferedReader;
  2. import java.io.IOException;
  3. import java.io.InputStream;
  4. import java.io.InputStreamReader;
  5. import java.io.PrintWriter;
  6. import java.util.ArrayList;
  7. import java.util.StringTokenizer;
  8.  
  9. public class SagheerAppleTree_AC1 {
  10.  
  11. 	static final int MAXA = 10000000;
  12. 	static ArrayList<Integer>[] adjList;
  13. 	static boolean[] blue;
  14. 	static int xorValue, cnt, cntBlue[], cntRed[],a[];
  15.  
  16. 	static void dfs(int u)
  17. 	{
  18. 		for(int v: adjList[u])
  19. 			dfs(v);
  20. 		blue[u] = adjList[u].size() == 0 || !blue[adjList[u].get(0)]; 
  21. 		if(blue[u])
  22. 		{
  23. 			xorValue ^= a[u];
  24. 			cntBlue[a[u]]++;
  25. 			++cnt;
  26. 		}
  27. 		else
  28. 			cntRed[a[u]]++;
  29. 	}
  30.  
  31. 	public static void main(String[] args) throws IOException {
  32. 		Scanner sc = new Scanner(System.in);
  33. 		PrintWriter out = new PrintWriter(System.out);
  34.  
  35. 		int n = sc.nextInt();
  36. 		a = new int[n];
  37. 		for(int i = 0; i < n; ++i)
  38. 			a[i] = sc.nextInt();
  39. 		adjList = new ArrayList[n];
  40. 		for(int i = 0; i < n; ++i)
  41. 			adjList[i] = new ArrayList<>(1);
  42. 		for(int i = 1; i < n; ++i)
  43. 			adjList[sc.nextInt() - 1].add(i);
  44. 		blue = new boolean[n];
  45. 		cntBlue = new int[MAXA + 1];
  46. 		cntRed = new int[MAXA + 1];
  47. 		dfs(0);
  48. 		long ans = 0;
  49. 		if(xorValue == 0)
  50. 		{
  51. 			for(int i = 1; i <= MAXA; ++i)
  52. 				ans += 1l * cntBlue[i] * cntRed[i];
  53. 			long x = cnt, y = n - x;
  54. 			ans += x * (x - 1) / 2 + y * (y - 1) / 2;
  55. 		}
  56. 		else
  57. 		{
  58. 			for(int i = 1; i <= MAXA; ++i)
  59. 			{
  60. 				int j = xorValue ^ i;
  61. 				if(j <= MAXA)
  62. 					ans += 1l * cntBlue[i] * cntRed[j];
  63. 			}
  64. 		}
  65. 		out.println(ans);
  66. 		out.flush();
  67. 		out.close();
  68. 	}
  69.  
  70. 	static class Scanner 
  71. 	{
  72. 		StringTokenizer st;
  73. 		BufferedReader br;
  74.  
  75. 		public Scanner(InputStream s){	br = new BufferedReader(new InputStreamReader(s));}
  76.  
  77. 		public String next() throws IOException 
  78. 		{
  79. 			while (st == null || !st.hasMoreTokens()) 
  80. 				st = new StringTokenizer(br.readLine());
  81. 			return st.nextToken();
  82. 		}
  83.  
  84. 		public int nextInt() throws IOException {return Integer.parseInt(next());}
  85.  
  86. 		public long nextLong() throws IOException {return Long.parseLong(next());}
  87.  
  88. 		public String nextLine() throws IOException {return br.readLine();}
  89.  
  90. 		public double nextDouble() throws IOException { return Double.parseDouble(next()); }
  91.  
  92. 		public boolean ready() throws IOException {return br.ready();} 
  93. 	}
  94. }
  95.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
Main.java:9: error: class SagheerAppleTree_AC1 is public, should be declared in a file named SagheerAppleTree_AC1.java
public class SagheerAppleTree_AC1 {
       ^
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
stdout 
Standard output is empty
https://ideone.com/9wj5dm
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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