Leetcode 190: Reverse Bits
Question
Reverse bits of a given 32 bits unsigned integer.
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Leetcode 191: Number of 1 Bits
Question Write a function that takes an unsigned integer and returns the number of ‘1’ bits it has (also known as the Hamming weight). [Read More] -
Leetcode 199: Binary Tree Right Side View
Question Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom. [Read More] -
Leetcode 213: House Robber II
Question You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed. All houses at this place are arranged in a circle. That means the first house is the neighbor of the last one. Meanwhile, adjacent houses have security system... [Read More] -
Leetcode 198: House Robber
Question You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping you from robbing each of them is that adjacent houses have security system connected and it will automatically contact the police if two adjacent... [Read More] -
Leetcode 200: Number of Islands
Question Given a 2d grid map of ‘1’s (land) and ‘0’s (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are all surrounded by water. [Read More] -
Disjoint Set Union
A Disjoint Set Union (DSU) data structure can be used to maintain knowledge of the connected components of a graph, and query for them quickly. In particular, we would like to support two operations: [Read More] -
Leetcode 179: Largest Number
Question Given a list of non negative integers, arrange them such that they form the largest number. [Read More] -
Leetcode 173: Binary Search Tree Iterator
Question Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. [Read More] -
Leetcode 172: Factorial Trailing Zeroes
Question Given an integer n, return the number of trailing zeroes in n!. [Read More] -
Leetcode 168: Excel Sheet Column Title
Question Given a positive integer, return its corresponding column title as appear in an Excel sheet. [Read More] -
Leetcode 162: Find Peak Element
Question A peak element is an element that is greater than its neighbors. [Read More] -
Leetcode 161: One Edit Distance
Question Given two strings s and t, determine if they are both one edit distance apart. [Read More] -
Leetcode 160: Intersection of Two Linked Lists
Question Write a program to find the node at which the intersection of two singly linked lists begins. [Read More] -
Leetcode 156: Binary Tree Upside Down
Question Given a binary tree where all the right nodes are either leaf nodes with a sibling (a left node that shares the same parent node) or empty, flip it upside down and turn it into a tree where the original right nodes turned into left leaf nodes. Return the... [Read More]