The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display…
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…
Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must…
Given n, how many structurally unique BST's (binary search trees) that store values 1 ... n? Example: Input: 3 Output: 5 Explanation: Given n…
Given a complete binary tree, count the number of nodes. Note: Definition of a complete binary tree from Wikipedia:In a complete binary tree…
Given a non-empty array of integers, every element appears three times except for one, which appears exactly once. Find that single one. Note: Your…
The demons had captured the princess (P) and imprisoned her in the bottom-right corner of a dungeon. The dungeon consists…
Given a positive integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. Example: Input: 3 Output:…
Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order. Example 1: Input: [ [ 1,…
Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its…
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