161. Write a program to find the number of ways to arrange n queens on an n x n chessboard.
162. Write a program to implement a simple online shopping cart system.
163. Write a program to find the maximum sum of a path in a triangle.
164. Write a program to implement the radix sort algorithm.
165. Write a program to find the longest substring that contains k distinct characters.
166. Write a program to find the total number of ways to make change for a given amount.
167. Write a program to implement a simple URL shortening service.
168. Write a program to find the longest path in a grid with obstacles.
169. Write a program to implement a basic calendar application.
170. Write a program to find the number of unique elements in a sorted array.
171. Write a program to solve the problem of finding a subarray with a given sum.
172. Write a program to implement a simple online quiz system.
173. Write a program to find the number of distinct elements in a 2D matrix.
174. Write a program to implement a simple online discussion forum.
175. Write a program to find the longest common substring of two strings.
176. Write a program to implement a basic document management system.
177. Write a program to find the maximum area of a histogram.
178. Write a program to find the total number of substrings in a string.
179. Write a program to implement the depth-first search (DFS) for a binary tree.
180. Write a program to find the minimum sum of a path from the top to the bottom of a triangle.
181. Write a program to implement a simple online portfolio system.
182. Write a program to find the longest palindrome substring in a string.
183. Write a program to find the maximum sum of a non-contiguous subarray.
184. Write a program to implement a simple online quiz application.
185. Write a program to find the number of ways to climb stairs with variable steps.
186. Write a program to implement a simple blogging platform with likes.
187. Write a program to find the longest common prefix among an array of strings.
188. Write a program to solve the problem of generating all possible subsets of a set.
189. Write a program to implement the heap sort algorithm.
190. Write a program to find the number of valid parentheses combinations.
191. Write a program to implement a basic restaurant management system.
192. Write a program to find the longest increasing path in a matrix.
193. Write a program to implement a simple online ticket booking system.
194. Write a program to find the maximum size of a square sub-matrix of 1s.
195. Write a program to find the number of ways to arrange n distinct objects.
196. Write a program to implement a simple online task manager.
197. Write a program to find the longest substring that contains at most two distinct characters.
198. Write a program to implement a basic chat application.
199. Write a program to find the maximum number of events that can be attended.
200. Write a program to implement a simple online file sharing system.