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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. class Main{
  5. 	static class Node{
  6. 		Node right;
  7. 		Node left;
  8. 		int data;
  9. 		Node(int data){
  10. 			this.data = data;
  11. 		}
  12. 	}
  13. 	static Node buildtree(int[]vals){
  14. 		if(vals.length==0 || vals[0] == -1) return null;
  15. 		Node root = new Node(vals[0]);
  16. 		Queue<Node> q = new LinkedList<>();
  17. 		q.offer(root);
  18. 		int i = 1;
  19. 		while(!q.isEmpty()&&i<vals.length){
  20. 			Node curr = q.poll();
  21. 			if(i<vals.length && vals[i]!= -1){
  22. 				curr.left = new Node(vals[i]);
  23. 				q.offer(curr.left);
  24. 			}i++;
  25. 			if(i<vals.length && vals[i]!= -1){
  26. 				curr.right = new Node(vals[i]);
  27. 				q.offer(curr.right);
  28. 			}i++;
  29. 		}
  30. 		return root;
  31. 	}
  32. 	static int sum(Node root){
  33. 		if(root == null) return 0;
  34. 		if(root.left == null && root.right == null) return root.data;
  35.  
  36. 		return sum(root.left)+sum(root.right);
  37. 	}
  38. 	public static void main(String[]args){
  39. 		Scanner sc = new Scanner(System.in);
  40. 		int n = sc.nextInt();
  41. 		int[] arr = new int[n];
  42. 		for(int i=0; i<n; i++){
  43. 			arr[i] = sc.nextInt();
  44. 		}
  45. 		Node root = buildtree(arr);
  46. 		System.out.println(sum(root));
  47. 	}
  48. }
Success #stdin #stdout 0.13s 54368KB
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https://ideone.com/MN69j9
language:
Java (HotSpot 12)
created:
18 hours ago
visibility:
public

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