Package g0101_0200.s0112_path_sum

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    112 - Path Sum\.

    Easy

    Given the root of a binary tree and an integer targetSum, return true if the tree has a root-to-leaf path such that adding up all the values along the path equals targetSum.

    A leaf is a node with no children.

    Example 1:

    Input: root = 5,4,8,11,null,13,4,7,2,null,null,null,1, targetSum = 22

    Output: true

    Explanation: The root-to-leaf path with the target sum is shown.

    Example 2:

    Input: root = 1,2,3, targetSum = 5

    Output: false

    Explanation: There two root-to-leaf paths in the tree:

    (1 --> 2): The sum is 3.

    (1 --> 3): The sum is 4.

    There is no root-to-leaf path with sum = 5.

    Example 3:

    Input: root = [], targetSum = 0

    Output: false

    Explanation: Since the tree is empty, there are no root-to-leaf paths.

    Constraints:

    • The number of nodes in the tree is in the range [0, 5000].

    • -1000 <= Node.val <= 1000

    • -1000 <= targetSum <= 1000

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final Boolean hasPathSum(TreeNode root, Integer targetSum)

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait