Hard

Title	Difficulty	Companies	Videos
Coin Path	Hard	google
Collect Coins in a Tree	Hard
Confusing Number II	Hard	google
Construct String with Minimum Cost	Hard
Contain Virus	Hard	bloomberg
Convert JSON String to Object	Hard
Count Almost Equal Pairs II	Hard
Count Anagrams	Hard
Count Complete Substrings	Hard
Count Houses in a Circular Street II	Hard
Count of Integers	Hard
Count Pairs With XOR in a Range	Hard
Count Palindromic Subsequences	Hard
Count Special Integers	Hard
Count Substrings That Can Be Rearranged to Contain a String II	Hard
Count Substrings That Satisfy K-Constraint II	Hard
Count the Number of Good Partitions	Hard
Count the Number of Incremovable Subarrays II	Hard
Count the Number of Infection Sequences	Hard
Count the Number of Inversions	Hard
Count the Number of K-Big Indices	Hard
Count the Number of Powerful Integers	Hard
Count Valid Paths in a Tree	Hard
Count Ways to Build Rooms in an Ant Colony	Hard
Count Ways to Distribute Candies	Hard
Count Ways to Make Array With Product	Hard
Create Components With Same Value	Hard
Cut Off Trees for Golf Event	Hard	amazon
Cycle Length Queries in a Tree	Hard
Design Cancellable Function	Hard
Design Excel Sum Formula	Hard	amazon microsoft
Difference Between Maximum and Minimum Price Sum	Hard
Dinner Plate Stacks	Hard	amazon bytedance
Distance to a Cycle in Undirected Graph	Hard
Distinct Echo Substrings	Hard	google
Divide an Array Into Subarrays With Minimum Cost II	Hard
Divide Array Into Increasing Sequences	Hard	google
Dynamic Pivoting of a Table	Hard
Erect the Fence II	Hard
Escape the Spreading Fire	Hard
Find Array Given Subset Sums	Hard
Find Building Where Alice and Bob Can Meet	Hard
Find Edges in Shortest Paths	Hard
Find Maximum Non-decreasing Array Length	Hard
Find Median Given Frequency of Numbers	Hard	pinterest
Find Number of Coins to Place in Tree Nodes	Hard
Find Shortest Path with K Hops	Hard
Find the Count of Monotonic Pairs I	Hard
Find the Count of Monotonic Pairs II	Hard
Find the Kth Smallest Sum of a Matrix With Sorted Rows	Hard	facebook