Problems

4,034+ problems · 962 Easy · 2104 Medium · 968 Hard

Title	Solution	Practice	Difficulty	Companies	Topics
3986. Number of Elapsed Seconds Between Two Times	Solution	Solve	Easy	-	Math String
3982. Sum of Integers with Maximum Digit Range	Solution	Solve	Easy	-	Array Math
3992. Rearrange String to Avoid Character Pair	Solution	Solve	Easy	-	Sorting String+1
3978. Unique Middle Element	Solution	Solve	Easy	-	Array Counting
3987. Minimum Total Cost to Process All Elements	Solution	Solve	Medium	-	Array Math+1
3990. Create Grid With Exactly K Paths II	Solution	Solve	Hard	-
3983. Subsequence After One Replacement	Solution	Solve	Medium	-	String Two Pointers
3988. Create Grid With Exactly K Paths I	Solution	Solve	Medium	-	Array Combinatorics+2
3979. Maximum Valid Pair Sum	Solution	Solve	Medium	-	Array Enumeration
3994. Minimum Adjacent Swaps to Partition Array	Solution	Solve	Medium	-	Array Greedy
3980. Minimum Operations to Transform Binary String	Solution	Solve	Medium	-	Dynamic Programming Greedy+1
3989. Maximum Consistent Columns in a Grid	Solution	Solve	Hard	-	Array Dynamic Programming+1
3984. Divisible Game	Solution	Solve	Medium	-	Array Dynamic Programming+3
3991. Sort Array Using Prefix Reversals	Solution	Solve	Medium	-
3995. Minimum Cost to Convert String III	Solution	Solve	Hard	-	Array Dynamic Programming+1
3981. Count Distinct Ways to Form Target from Two Strings	Solution	Solve	Hard	-	Dynamic Programming Prefix Sum+1
3985. Palindromic Subarray Sum	Solution	Solve	Hard	-	Array Binary Search+2
3998. Transform Binary String Using Subsequence Sort	Solution	Solve	Medium	-	Array Greedy+2
3999. Minimum Number of String Groups Through Transformations	Solution	Solve	Hard	-	Hash Table String+1
4000. Largest Integer With Given Digit Sum	Solution	Solve	Easy	-	Greedy Math
4002. Count Valid Sequences	Solution	Solve	Medium	-	Combinatorics Math
4001. Aggregate Two Time Series	Solution	Solve	Medium	-	Array Two Pointers
4003. Minimum Cost Path with Alternating Directions III	Solution	Solve	Hard	-	Array Graph+3
4005. Minimum Operations to Make Array Equal III	Solution	Solve	Hard	-
4004. Minimum Moves to Balance Circular Array II	Solution	Solve	Hard	-
4006. Count Valid Prefixes	Solution	Solve	Easy	-	Counting String
4007. Widest Possible Fence	Solution	Solve	Hard	-	Array Counting+2
4008. Minimum Initial Strength to Defeat All Monsters	Solution	Solve	Medium	-	Array Binary Search+2
4009. Minimum Possible Maximum Waiting Time	Solution	Solve	Hard	-	Array Dynamic Programming+1
4010. Maximize Pair Strength Using GCD	Solution	Solve	Easy	-	Array Enumeration+2
4013. Count Subarrays With Even Odd Ratio II	Solution	Solve	Hard	-	Array Binary Indexed Tree+4
4011. Count Subarrays With Even Odd Ratio I	Solution	Solve	Medium	-	Array Binary Indexed Tree+4
4012. Count of Unfinished Tasks After Each Shift	Solution	Solve	Medium	-	Array Binary Search+1
4014. Minimum Total Price After Applying Discounts	Solution	Solve	Medium	-	Array Greedy+2
4015. Weighted Sum of a Tree	Solution	Solve	Medium	-	Array Depth-First Search+1
4017. Peaks in Array II	Solution	Solve	Hard	-	Array Divide and Conquer+1
4018. Total Sum of Interaction Cost in Tree Groups II	Solution	Solve	Hard	-
4016. Maximum Area of Two Non-Overlapping Square Submatrices	Solution	Solve	Medium	-	Array Binary Search+2
4019. Merge Close Characters II	Solution	Solve	Medium	-
4023. Elevator Requests II	Solution	Solve	Hard	-	Array Dynamic Programming+1
4020. Elevator Requests I	Solution	Solve	Easy	-	Array Simulation
4021. Minimum Operations to Make a Rotated Palindrome I	Solution	Solve	Medium	-	Enumeration Math+1
4022. K-th Digit in Infinite String	Solution	Solve	Medium	-	Binary Search Math
4027. Elevator Requests III	Solution	Solve	Hard	-	Array Bit Manipulation+3
4024. Nearest Available Drone	Solution	Solve	Easy	-	Array Enumeration
4025. Minimize the Maximum Waiting Time at Synchronized Traffic Lights	Solution	Solve	Medium	-	Array Greedy
4029. Minimum Operations to Make a Rotated Palindrome II	Solution	Solve	Hard	-
4026. Maximum Gap Between Stations	Solution	Solve	Medium	-	Greedy String+1
4030. Elevator Requests IV	Solution	Solve	Easy	-
4028. Minimum Operations to Make a Rotated Palindrome II	Solution	Solve	Hard	-