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Topic: Java-language-question / Level: Intermediate
230. Write a program to implement a priority queue.
231. Write a program to calculate the median of two sorted arrays.
232. Write a program to flatten a nested list structure.
233. Write a program to find the intersection of two arrays.
234. Write a program to implement a simple Trie.
235. Write a program to find the longest substring with at most two distinct characters.
236. Write a program to implement a simple text editor with basic operations.
237. Write a program to perform a topological sort on a directed graph.
238. Write a program to find the duplicate number in an array.
239. Write a program to check if two strings are anagrams using character counts.
240. Write a program to implement a simple stopwatch.
241. Write a program to find the shortest palindrome by adding characters at the front.
242. Write a program to find all anagrams of a given string in another string.
243. Write a program to implement a depth-first traversal of a binary tree.
244. Write a program to find the longest sequence of consecutive numbers in an array.
245. Write a program to implement the insertion sort algorithm.
246. Write a program to check if a number is a power of three.
247. Write a program to calculate the number of unique paths in a grid.
248. Write a program to generate all possible combinations of a set of characters.
249. Write a program to implement the selection sort algorithm.
250. Write a program to find the missing number in an arithmetic progression.
251. Write a program to calculate the number of ways to reach the Nth stair.
252. Write a program to implement a simple event-driven programming model.
253. Write a program to find the intersection of two linked lists.
254. Write a program to find the longest valid parentheses substring.
255. Write a program to implement the shell sort algorithm.
256. Write a program to check if a linked list is a palindrome.
257. Write a program to find the longest common prefix among a set of strings.
258. Write a program to implement a simple recommendation system.
259. Write a program to find the sum of the digits of a number using recursion.
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