Problems

3,947+ problems · 946 Easy · 2062 Medium · 939 Hard

Active:Hard· 939 results

Title	Solution	Practice	Difficulty	Companies	Topics
3425. Longest Special Path	Solution	Solve	Hard	-	Array Depth-First Search+3
3405. Count the Number of Arrays with K Matching Adjacent Elements	Solution	Solve	Hard	Amazon+4	Combinatorics Math
3378. Count Connected Components in LCM Graph	Solution	Solve	Hard	-	Array Hash Table+3
3420. Count Non-Decreasing Subarrays After K Operations	Solution	Solve	Hard	Google+1	Array Monotonic Queue+5
3389. Minimum Operations to Make Character Frequencies Equal	Solution	Solve	Hard	Google+1	Counting Dynamic Programming+3
3414. Maximum Score of Non-overlapping Intervals	Solution	Solve	Hard	Amazon+1	Array Binary Search+2
3888. Minimum Operations to Make All Grid Elements Equal	Solution	Solve	Hard	-
3883. Count Non Decreasing Arrays With Given Digit Sums	Solution	Solve	Hard	-	Array Dynamic Programming+1
3886. Sum of Sortable Integers	Solution	Solve	Hard	-	Array Enumeration+2
3887. Incremental Even-Weighted Cycle Queries	Solution	Solve	Hard	-	Graph Union Find
3892. Minimum Operations to Achieve At Least K Peaks	Solution	Solve	Hard	-	Array Dynamic Programming
3897. Maximum Value of Concatenated Binary Segments	Solution	Solve	Hard	-	Array Greedy+1
3901. Good Subsequence Queries	Solution	Solve	Hard	-	Array Math+2
3906. Count Good Integers on a Grid Path	Solution	Solve	Hard	-	Dynamic Programming
3911. K-th Smallest Remaining Even Integer in Subarray Queries	Solution	Solve	Hard	-	Array Binary Search
3910. Count Connected Subgraphs with Even Node Sum	Solution	Solve	Hard	-	Array Bit Manipulation+5
3915. Maximum Sum of Alternating Subsequence With Distance at Least K	Solution	Solve	Hard	-	Array Dynamic Programming+1
3916. Number of ZigZag Arrays III	Solution	Solve	Hard	-
3920. Maximize Fixed Points After Deletions	Solution	Solve	Hard	-	Array Binary Search+1
3924. Minimum Threshold Path With Limited Heavy Edges	Solution	Solve	Hard	-	Binary Search Breadth-First Search+1
3928. Minimum Cost to Buy Apples II	Solution	Solve	Hard	-	Array Graph+2
3929. Minimum Partition Score II	Solution	Solve	Hard	-
3930. Power Update After K-th Largest Insertion II	Solution	Solve	Hard	-
3934. Smallest Unique Subarray	Solution	Solve	Hard	-	Array Binary Search+4
3943. Number of Pairs After Increment	Solution	Solve	Hard	-	Array Counting+2
3939. Count Non Adjacent Subsets in a Rooted Tree	Solution	Solve	Hard	-	Array Depth-First Search+2
3944. Minimum Operations to Make Array Modulo Alternating II	Solution	Solve	Hard	-
3948. Lexicographically Maximum MEX Array	Solution	Solve	Hard	-	Array Greedy+2
3949. Subtree Inversion Sum II	Solution	Solve	Hard	-
3953. Maximum Score with Co-Prime Element	Solution	Solve	Hard	-	Array Combinatorics+4
3957. Maximum Sum of M Non-Overlapping Subarrays II	Solution	Solve	Hard	-	Array Binary Search+5
3956. Maximum Sum of M Non-Overlapping Subarrays I	Solution	Solve	Hard	-	Array Binary Search+5
3962. Maximum Subarray Sum After at Most K Swaps	Solution	Solve	Hard	-
3972. Valid Subarrays With Matching Sum Digits II	Solution	Solve	Hard	-
3966. Count Good Integers in a Range	Solution	Solve	Hard	-
3971. Maximum Total Value	Solution	Solve	Hard	-	Array Binary Search+2
3967. Finish Time of Tasks II	Solution	Solve	Hard	-
3973. Distinct Gate Paths to LCA	Solution	Solve	Hard	-
3977. Minimum Time to Reach Target With Limited Power	Solution	Solve	Hard	-	Array Dynamic Programming+3