Leetcode 52: N-Queens II
Question
The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other.
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Leetcode 51: N-Queens
Question The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. [Read More] -
Leetcode 45: Jump Game II
Question Given an array of non-negative integers, you are initially positioned at the first index of the array. [Read More] -
Leetcode 10: Regular Expression Matching
Question Given an input string (s) and a pattern (p), implement regular expression matching with support for '.' and '*'. [Read More] -
Leetcode 268: Missing Number
Question Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array. [Read More] -
Leetcode 266: Palindrome Permutation
Question Given a string, determine if a permutation of the string could form a palindrome. [Read More] -
Leetcode 267: Palindrome Permutation II
Question Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation could be form. [Read More] -
Leetcode 261: Graph Valid Tree
Question Given n nodes labeled from 0 to n-1 and a list of undirected edges (each edge is a pair of nodes), write a function to check whether these edges make up a valid tree. [Read More] -
Leetcode 259: 3Sum Smaller
Question Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 <= i < j < k < n that satisfy the condition nums[i] + nums[j] + nums[k] < target. [Read More] -
Leetcode 177: Nth Highest Salary
Question Write a SQL query to get the \(n^{th}\) highest salary from the Employee table. [Read More] -
Leetcode 176: Second Highest Salary
Question Write a SQL query to get the second highest salary from the Employee table. [Read More] -
Leetcode 175: Combine Two Tables
Question Table: Person +-------------+---------+ | Column Name | Type | +-------------+---------+ | PersonId | int | | FirstName | varchar | | LastName | varchar | +-------------+---------+ PersonId is the primary key column for this table. [Read More] -
Leetcode 257: Binary Tree Paths
Question Given a binary tree, return all root-to-leaf paths. [Read More] -
Leetcode 256: Paint House
Question There are a row of n houses, each house can be painted with one of the three colors: red, blue or green. The cost of painting each house with a certain color is different. You have to paint all the houses such that no two adjacent houses have the... [Read More] -
Leetcode 255: Verify Preorder Sequence in Binary Search Tree
Question Given an array of numbers, verify whether it is the correct preorder traversal sequence of a binary search tree. [Read More]