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Java Exercises: Find the length of the longest consecutive sequence path of a given binary tree

Java Basic: Exercise-184 with Solution

Write a Java program to find the length of the longest consecutive sequence path of a given binary tree.

Note: The longest consecutive path need to be from parent to child.

Sample Binary tree:

Java Basic Exercises: Find the length of the longest consecutive sequence path of a given binary tree.

Result:

Java Basic Exercises: Find the length of the longest consecutive sequence path of a given binary tree.

Sample Solution:

Java Code:

import java.util.*;
public class Solution {  
   public static void main(String[] args) {
        TreeNode a = new TreeNode(1);
        a.right = new TreeNode(3);
        a.right.left = new TreeNode(2);
		a.right.right = new TreeNode(4);
		a.right.right.right = new TreeNode(5);
		a.right.right.right.right = new TreeNode(6);
		System.out.println("Length of the longest consecutive sequence path: "+longest_Consecutive(a));
    }
  public static int longest_Consecutive(TreeNode root) {
        if (root == null) {
            return 0;
        }
        int result = diffn(root, 1) + diffn(root, -1);
        return Math.max(result, Math.max(longest_Consecutive(root.left), longest_Consecutive(root.right)));
    }
    private static int diffn(TreeNode tnode, int diff) {
        if (tnode == null) {
            return 0;
        }
        int left_depth = 0, right_depth = 0;
        // check node
        if (tnode.left != null && tnode.val - tnode.left.val == diff) {
            left_depth = diffn(tnode.left, diff) + 1;
        }
        if (tnode.right != null && tnode.val - tnode.right.val == diff) {
            right_depth = diffn(tnode.right, diff) + 1;
        }
        return Math.max(left_depth, right_depth);
    }
}

Sample Output: 

Length of the longest consecutive sequence path:  4

Flowchart:

Flowchart: Java exercises: Find the length of the longest consecutive sequence path of a given binary tree.

Java Code Editor:

Company:  Google NetEase

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Java: Tips of the Day

Java: Anagrams

Generates all anagrams of a string.

public static List<String> anagrams(String input) {
    if (input.length() <= 2) {
        return input.length() == 2
                ? Arrays.asList(input, input.substring(1) + input.substring(0, 1))
                : Collections.singletonList(input);
    }
    return IntStream.range(0, input.length())
            .mapToObj(i -> new SimpleEntry<>(i, input.substring(i, i + 1)))
            .flatMap(entry ->
                    anagrams(input.substring(0, entry.getKey()) + input.substring(entry.getKey() + 1))
                            .stream()
                            .map(s -> entry.getValue() + s))
            .collect(Collectors.toList());
}

Ref: https://bit.ly/3rvAdAK