08:49

Leetcode 126. Word Ladder II (bfs + backtracking)

10:04

Leetcode 3082. Find the Sum of the Power of All Subsequences (01 knapsack)

08:34

Leetcode 2291. Maximum Profit From Trading Stocks (01 knapsack)

06:32

Leetcode 139. Word Break (partition dp)

06:42

Leetcode 2369. Check if There is a Valid Partition For The Array (split dp)

20:42

Leetcode 834. Sum of Distances in Tree (dp on trees)

12:29

Leetcode 2204. Distance to a Cycle in Undirected Graph (tree cycle)

21:57

Leetcode 2360. Longest Cycle in a Graph (tree cycle)

16:58

Leetcode 147. Insertion Sort List (linked list)

13:33

Leetcode 725. Split Linked List in Parts (linked list)

07:50

Leetcode 1209. Remove All Adjacent Duplicates in String II (stack)

09:16

Leetcode 1669. Merge In Between Linked Lists (linked list)

20:11

Leetcode 1233. Remove Sub-Folders from the Filesystem (from sort + stack to Trie)

15:51

Leetcode 2416. Sum of Prefix Scores of Strings (Trie)

07:13

Leetcode 2275. Largest Combination With Bitwise AND Greater Than Zero (bit manipulation)

15:55

Leetcode 1411. Number of Ways to Paint N × 3 Grid (dfs + memo with combination)

07:47

Leetcode 1121. Divide Array Into Increasing Sequences (greedy)

28:55

Leetcode 2659. Make Array Empty (binary index tree)

25:03

Leetcode 2179. Count Good Triplets in an Array (sorted list)

19:51

Leetcode 1775. Equal Sum Arrays With Minimum Number of Operations (greedy)

20:21

Leetcode 1262. Greatest Sum Divisible by Three (greedy math + sort)

04:56

Leetcode 3074. Apple Redistribution into Boxes (sort)

08:16

Leetcode 1833. Maximum Ice Cream Bars (greedy + counting sort)

17:52

Leetcode 838. Push Dominoes (simulation)

11:27

Leetcode 1042. Flower Planting With No Adjacent (graph + set)

14:48

Leetcode 1293. Shortest Path in a Grid with Obstacles Elimination (grid bfs)

11:34

Leetcode 1559. Detect Cycles in 2D Grid (union find)

07:35

Leetcode 1254. Number of Closed Islands (dfs)

41:32

Leetcode pattern (1d difference array)

15:20

Leetcode 946. Validate Stack Sequences (stack)

25:05

Leetcode 2528. Maximize the Minimum Powered City (difference array update online)

33:52

Leetcode 2132. Stamping the Grid (2d difference array)

24:55

Leetcode 2536. Increment Submatrices by One (brute force to 1d and 2d difference array)

16:15

Leetcode 253. Meeting Rooms II (difference array, sweep line and greedy)

10:51

Leetcode 1943. Describe the Painting (difference array)

10:34

Leetcode 2772. Apply Operations to Make All Array Elements Equal to Zero (difference array)

08:53

Leetcode 1589. Maximum Sum Obtained of Any Permutation (difference array)

29:52

Leetcode 995. Minimum Number of K Consecutive Bit Flips (difference array and sliding window hard)

12:51

Leetcode 2381. Shifting Letters II (difference array)

20:19

Leetcode 2406. Divide Intervals Into Minimum Number of Groups (difference array)

09:10

Leetcode 732. My Calendar III (sweep line)

10:04

Leetcode 57. Insert Interval (greedy and sweep line)

45:59

Leetcode 631. Design Excel Sum Formula (bfs)

07:58

Leetcode 1328. Break a Palindrome (greedy)

13:45

Leetcode 2830. Maximize the Profit as the Salesman (dp max profit)

15:46

Leetcode 2008. Maximum Earnings From Taxi (dp max profit)