# LeetCode 169. Majority Element

Description https://leetcode.com/problems/majority-element/ Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊…

# LeetCode 297. Serialize and Deserialize Binary Tree

Description https://leetcode.com/problems/serialize-and-deserialize-binary-tree/ Serialization is the process of converting a data structure or object into a sequence of bits so that…

# LeetCode 171. Excel Sheet Column Number

Description https://leetcode.com/problems/excel-sheet-column-number/ Given a column title as appear in an Excel sheet, return its corresponding column number. For example: A…

# LeetCode 50. Pow(x, n)

Description https://leetcode.com/problems/longest-increasing-subsequence/ Implement pow(x, n), which calculates x raised to the power n (xn). Example 1: Input: 2.00000, 10 Output: 1024.00000 Example 2: Input: 2.10000, 3…

# LeetCode 300. Longest Increasing Subsequence

Description https://leetcode.com/problems/longest-increasing-subsequence/ Given an unsorted array of integers, find the length of longest increasing subsequence. Example: Input: [10,9,2,5,3,7,101,18] Output: 4…

# LeetCode 172. Factorial Trailing Zeroes

Description https://leetcode.com/problems/factorial-trailing-zeroes/ Given an integer n, return the number of trailing zeroes in n!. Example 1: Input: 3 Output: 0 Explanation: 3! =…

# LeetCode 322. Coin Change

Description https://leetcode.com/problems/coin-change/ You are given coins of different denominations and a total amount of money amount. Write a function to compute…

# LeetCode 116. Populating Next Right Pointers in Each Node

Description https://leetcode.com/problems/search-a-2d-matrix-ii/ You are given a perfect binary tree where all leaves are on the same level, and every parent has two children.…

# LeetCode 240. Search a 2D Matrix II

Description https://leetcode.com/problems/search-a-2d-matrix-ii/ Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers…

# LeetCode 56. Merge Intervals

Description https://leetcode.com/problems/merge-intervals/ Given a collection of intervals, merge all overlapping intervals. Example 1: Input: [[1,3],[2,6],[8,10],[15,18]] Output: [[1,6],[8,10],[15,18]] Explanation: Since intervals…