Array

Determine if an array is sorted in ascending, descending, or not sorted at all

Convert a sorted array to a height-balanced binary search tree.

Find the number of days until a warmer temperature for each day.

Design a circular queue with fixed size that supports enqueue, dequeue, front, rear, isEmpty, and isFull operations.

Find the duplicate number in an array containing n+1 integers where each integer is between 1 and n (inclusive)

Find and return the largest element in an array of integers

Find and return the second largest element in an array of integers

Implement a queue using arrays or linked lists with O(1) time complexity for all operations.

Design and implement a stack data structure with push, pop, top, and empty operations

Maximize array sum by flipping signs of k elements using greedy heap approach

Merge two sorted arrays into a single sorted array in-place

Find the missing number in an array containing n distinct numbers taken from 0, 1, 2, ..., n.

Move all zeros in an array to the end while maintaining the relative order of non-zero elements

Find the next greater element for each element in an array.

Find minimum removals to reduce array size by half using greedy heap approach

Reverse the order of elements in an array in-place and return the modified array

Rotate an array to the right by k steps where k is non-negative

Find the maximum element in each sliding window of size k

Calculate the span of stock prices for each day

Find a subarray with a given sum in an array of positive integers.

Calculate how much rainwater can be trapped between bars of different heights

Find two numbers in an array that add up to a target value.