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Coding problems
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  • Deque
    • Deque with 3 stacks
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  • DFS Permutations
    • All subsets I
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    • Combinations For Telephone Pad I
    • Subsets of all permuations
    • Generate N valid parentheses I
    • Generate N valid parentheses II
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    • Combinations of Coin
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    • Array Hopper I
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    • Cut Rope
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    • Largest Cross of Ones
    • Largest Square Surrounded By One
    • Largest X of 1s
    • Largest Square of Matches
    • Largest Submatrix Sum
    • Longest Ascending Subsequence I & II
    • Longest Common Sequence between two strings
    • Most with positive slope
    • Palindrome Partition
    • Edit Distance
    • Square of ones
    • Wild card matching
    • Wood Cutting
    • 188. Best Time to Buy and Sell Stock IV
  • Graph Search
    • Kth closest to <0, 0, 0>
    • Largest Product of Length
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    • Top K frequent words
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  • Problem Solving
    • Water Level I
    • Largest rectangle in histogram
    • Range Addition II
  • Recursion
    • ReverseTree
    • NQueen
    • NQueen optimized
    • Spiral Order Print I
    • Spiral Order Print II
    • String Abbreviation Matching
  • Sliding Window
    • Longest subarray contains only 1s
    • Longest Substring Without Repeating Characters
    • Maximum Number within Window
  • Sorts
    • QuickSort
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    • Reverse Words on sentence
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    • Right shift N characters
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    • String Abbreviation Matching
  • Tree Traversal
    • Check balanced tree
    • Check if complete tree
    • Delete in binary tree
    • LCA of two tree nodes
    • Get Keys In Binary Search Tree In Given Range
    • Height of Tree
    • Symmetric Tree?
    • Tweaked Binary tree
    • Set left node count
    • Greatest difference Left and Right subtree count Node
    • Largest Number Smaller in BST
    • Closest Number in Binary Search Tree II
    • Max Path Sum From Leaf To Root
    • Maximum Path Sum Binary Tree I
    • Maximum Path Sum Binary Tree II
    • Maximum Path Sum Binary Tree III
    • Flatten Binary Tree to Linked List
    • Iterative Post-Order Traversal
  • Unsorted Array
    • Find missing number
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  1. Tree Traversal

Max Path Sum From Leaf To Root

Given a binary tree in which each node contains an integer number. Find the maximum possible path sum from a leaf to root.

Assumptions

The root of given binary tree is not null.

Examples

10

/ \

-2 7

/ \

8 -4

The maximum path sum is 10 + 7 = 17.

Solution: Recursive bottom up

Base Case: root == null, return 0

From Children: get two max value paths

At current level:

To parent: pick higher value path between left and right and return to parent

PreviousClosest Number in Binary Search Tree IINextMaximum Path Sum Binary Tree I

Last updated 4 years ago

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