Given an integer matrix, find the length of the longest increasing path.
From each cell, you can either move to four directions: left, right, up or down. You may NOT move ...
Given a singly linked list, group all odd nodes together followed by the even nodes. Please note here we are talking about the node number and not the value in the nodes.
You should try to do it in ...
Given an integer array
nums, return the number of range sums that lie in
[lower, upper] inclusive.
S(i, j) is defined as the sum of the elements in
nums between indices
i ≤ ...
Given an integer, write a function to determine if it is a power of three.
Could you do it without using any loop / recursion?
Given a binary tree containing digits from
0-9 only, each root-to-leaf path could represent a number.
An example is the root-to-leaf path
1->2->3 which represents the number
Find the total sum of all root-to-leaf numbers.