Toolliyo Practice

Problems explorer

Browse by topic · auto-judge · company sheets · roadmaps — not just a problem dump.

505 problems in this topic

# Title Topics Acceptance Pts Difficulty
251 Reconstruct Itinerary — 40 Hard Solve
252 Reorder List — 30 Medium Solve
253 Sum of Two Integers — 30 Medium Solve
254 Valid Anagram — 20 Easy Solve
255 Valid Sudoku — 30 Medium Solve
256 Word Search — 30 Medium Solve
257 Cheapest Flights Within K Stops — 30 Medium Solve
258 Evaluate Reverse Polish Notation — 30 Medium Solve
259 Kth Largest Element in a Stream — 20 Easy Solve
260 Last Stone Weight — 20 Easy Solve
261 Longest Consecutive Sequence — 30 Medium Solve
262 Longest Increasing Path in a Matrix — 40 Hard Solve
263 Max Area of Island — 30 Medium Solve
264 Merge k Sorted Lists — 40 Hard Solve
265 Min Cost Climbing Stairs — 20 Easy Solve
266 Multiply Strings — 30 Medium Solve
267 Non-overlapping Intervals — 30 Medium Solve
268 Number of Connected Components in an Undirected Graph — 30 Medium Solve
269 Pacific Atlantic Water Flow — 30 Medium Solve
270 Product of Array Except Self — 30 Medium Solve
271 Same Tree — 20 Easy Solve
272 Trapping Rain Water — 40 Hard Solve
273 Alien Dictionary — 40 Hard Solve
274 Combination Sum — 30 Medium Solve
275 Container With Most Water — 30 Medium Solve
276 Decode Ways — 30 Medium Solve
277 Happy Number — 20 Easy Solve
278 Jump Game II — 30 Medium Solve
279 Koko Eating Bananas — 30 Medium Solve
280 Kth Smallest Element in a BST — 30 Medium Solve
281 Longest Substring Without Repeating Characters — 30 Medium Solve
282 Maximum Product Subarray — 30 Medium Solve
283 Number of Connected Components in an Undirected Graph — 30 Medium Solve
284 Redundant Connection — 30 Medium Solve
285 Subsets — 30 Medium Solve
286 Subtree of Another Tree — 20 Easy Solve
287 Sum of Two Integers — 30 Medium Solve
288 Valid Parentheses — 20 Easy Solve
289 Alien Dictionary — 40 Hard Solve
290 Binary Search — 20 Easy Solve
291 Coin Change 2 — 30 Medium Solve
292 Construct Binary Tree from Preorder and Inorder Traversal — 30 Medium Solve
293 Counting Bits — 20 Easy Solve
294 Evaluate Reverse Polish Notation — 30 Medium Solve
295 Kth Largest Element in a Stream — 20 Easy Solve
296 Letter Combinations of a Phone Number — 30 Medium Solve
297 Longest Common Subsequence — 30 Medium Solve
298 Merge Intervals — 30 Medium Solve
299 N-Queens — 40 Hard Solve
300 Palindromic Substrings — 30 Medium Solve
Toolliyo Assistant
Ask about tutorials, ebooks, training, pricing, mentor services, and support. I use public site content only—not admin or internal tools.

care@toolliyo.com

Need callback? Share your details