LeetCode 124. Binary Tree Maximum Path Sum
To find the maximum path sum in a binary tree, we can use a recursive approach. The idea is to traverse the tree in a bottom-up manner and calculate the maximum path sum for each node.
To find the maximum path sum in a binary tree, we can use a recursive approach. The idea is to traverse the tree in a bottom-up manner and calculate the maximum path sum for each node.
Because all the words are the same length, we can use hash map to check for substring from index i to index i +word length * words number.
We can calculate the water amount by columns. For position i, the water it can contains is based on the left max height column and the right max height columns.
This problem can be see as finding peak and valley. And we need to start checking the peak in order to remove the redundant count.
I’ve ran into a problem recently while deploying my HEXO blog to GitHub.
Note of learning resource operation.
Note of learning Transaction Management.
We can get the n pairs of parentheses by combining the x pairs with n-1-x pairs then combine with one pair "()".
Solve using three ways.
Use two pointers, let them always have a distance of n, so when right pointer reach the end, the left pointer is the last nth node.