Coding Problems

Combine two strings into one

Maximize profit with 1 day cooldown after sell

Detect if there is a cycle in circular array (forward/backward moves)

Find shortest subarray that if sorted would make entire array sorted

Find maximum difference between successive elements in sorted form (O(n) time/space)

Minimize largest sum when splitting array into m subarrays

Find peak element in 2D array (greater than all neighbors)

Reorder array so nums[0] ≤ nums[1] ≥ nums[2] ≤ nums[3]... (in-place)

Check if array has continuous subarray of size ≥ 2 with sum multiple of k

Count subarrays where sum is divisible by k

Find k closest elements to target in sorted array

Find maximum envelopes you can stack (one inside another)

Find maximum sum subarray in circular array

Count how many elements to the right are smaller than current element

Find largest rectangular area under histogram

Find max in each sliding window of size k (O(n) solution)

Find median of two sorted arrays in O(log(min(m,n))) time

Find least number of intervals to complete tasks with cooldown

Find all unique triplets that sum to zero

Find indices of two numbers that add up to target value