Toolliyo Practice

Problems explorer

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

3300 problems in this topic

# Title Topics Acceptance Pts Difficulty
751 Construct Binary Tree from Preorder and Inorder Traversal 30 Medium Solve
752 Copy List with Random Pointer 30 Medium Solve
753 Count Good Nodes in Binary Tree 30 Medium Solve
754 Decode Ways 30 Medium Solve
755 Design Add and Search Words Data Structure 30 Medium Solve
756 Design Twitter 30 Medium Solve
757 Diameter of Binary Tree 20 Easy Solve
758 Group Anagrams 30 Medium Solve
759 Interleaving String 30 Medium Solve
760 Jump Game II 30 Medium Solve
761 Koko Eating Bananas 30 Medium Solve
762 Koko Eating Bananas 30 Medium Solve
763 Kth Smallest Element in a BST 30 Medium Solve
764 Kth Smallest Element in a BST 30 Medium Solve
765 LRU Cache 30 Medium Solve
766 Last Stone Weight 20 Easy Solve
767 Longest Common Subsequence 30 Medium Solve
768 Longest Consecutive Sequence 30 Medium Solve
769 Longest Increasing Path in a Matrix 40 Hard Solve
770 Longest Repeating Character Replacement 30 Medium Solve
771 Max Area of Island 30 Medium Solve
772 Maximum Depth of Binary Tree 20 Easy Solve
773 Maximum Product Subarray 30 Medium Solve
774 Maximum Product Subarray 30 Medium Solve
775 Maximum Subarray 30 Medium Solve
776 Merge Intervals 30 Medium Solve
777 Merge Triplets to Form Target Triplet 30 Medium Solve
778 Missing Number 20 Easy Solve
779 Number of 1 Bits 20 Easy Solve
780 Number of 1 Bits 20 Easy Solve
781 Number of Connected Components in an Undirected Graph 30 Medium Solve
782 Number of Connected Components in an Undirected Graph 30 Medium Solve
783 Palindromic Substrings 30 Medium Solve
784 Permutation in String 30 Medium Solve
785 Reconstruct Itinerary 40 Hard Solve
786 Regular Expression Matching 40 Hard Solve
787 Remove Nth Node From End of List 30 Medium Solve
788 Reverse Bits 20 Easy Solve
789 Rotate Image 30 Medium Solve
790 Search a 2D Matrix 30 Medium Solve
791 Search a 2D Matrix 30 Medium Solve
792 Set Matrix Zeroes 30 Medium Solve
793 Single Number 20 Easy Solve
794 Sliding Window Maximum 40 Hard Solve
795 Spiral Matrix 30 Medium Solve
796 Subtree of Another Tree 20 Easy Solve
797 Time Based Key-Value Store 30 Medium Solve
798 Two Sum II - Input Array Is Sorted 30 Medium Solve
799 Valid Parentheses 20 Easy Solve
800 Valid Parenthesis String 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