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Problems Hard

No. Problem
4 Median of Two Sorted Arrays
10 Regular Expression Matching
25 Reverse Nodes in k-Group
34 Find First and Last Position of Element in Sorted Array
37 Sudoku Solver
41 First Missing Positive
42 Trapping Rain Water
68 Test Justification
72 Edit Distance
76 Minimum Window Substring
115 Distinct Subsequences
127 Word Ladder
135 Candy
233 Number of Digit One
239 Sliding Window Max
273 Integer to English Words
332 Reconstruct Itinerary
664 Strange Printer
847 Shortest Path Visiting all Nodes
920 Number of Music Playlists
1095 Find in Mountain Array
1203 Sort Items by Groups Respecting Dependencies
1220 Count Vowels Permutation
1269 Number of Ways to Stay in the Same Place After Some Steps
1326 Min no of Taps to Open to Water a Garden
1359 Count All Valid Pickup and Delivery Options
1420 build array where you can find maximum exactly k comparison
1425 Constrained Subsequence Sum
1458 Max Dot Product of Two Subsequences
1489 Find Critical and Pseudo-Critical Edges in Min Spanning Tree
1793 Maximum Score of a Good Subarray
2009 Minimum Number of Operations to Make Array Continuous
2050 Parallel Courses III
2141 Maximum Running Time
2227 Encrypt and Decrypt String
2251 Number Of Flowers In Full Bloom
2366 Min Replacements to Sort an Array
2742 Painting the Walls