Find the indices of the two numbers in an array that add up to a specific target sum

Find all unique triplets in an array that sum up to zero

Find combinations of integers summing to a target

Find the maximum amount of water that can be held between two skyscrapers

Find the minimum element in a rotated sorted array

Find an array where each element is the product of all others

Calculate the minimum number of hot air balloons needed to accommodate all flights without overlaps

Merge two sorted linked lists into one sorted linked list

Reverse a singly linked list

Remove the nth node from the end of a linked list and return the head of the modified list

Reorder a list by alternating the first and last elements in the sequence

Merge all overlapping intervals into a list of non-overlapping intervals

Find the minimum number of overlapping intervals to remove for non-overlapping intervals

Insert and merge a new interval into sorted, non-overlapping intervals

Determine if a given string is a palindrome

Check if a string of parentheses, brackets, and braces is balanced

Find the length of the longest palindromic substring in a given string

Find the length of the longest substring without repeating characters

Find the smallest substring that contains all the characters of another string

Rotate a N x N 2D matrix by 90 degrees clockwise

Set entire rows and columns to zero if any element is zero in an m x n matrix

Count the number of islands formed by adjacent lands in a 2D grid

Return matrix elements in a spiral order

Determine if two binary trees are identical

Invert a binary tree by swapping all left and right child nodes

Determine the maximum depth of a binary tree from root to leaf

Return node values in level order traversal for a binary tree

Check if one binary tree is a subtree of another binary tree

Check if a binary tree is a valid binary search tree

Return the kth smallest value from a binary search tree

Convert a BST to a string

Find the maximum path sum in a binary tree

Return the number of 1s in the binary representation of a positive integer

Reverse the bits of a given 32-bit unsigned integer

Compute the number of 1's in the binary representation for each number from 0 to n

Calculate the sum of two integers using bitwise operations instead of + or -

Identify the smallest missing positive number in an unsorted array

Determine if one string is an anagram of another

Find the longest substring with the same letter after changing up to k characters

Find the longest consecutive sequence length in an unsorted array

Return true if the array contains duplicates, false if all elements are unique

Identify the k most frequent elements in an integer array, returning them sorted by their frequency in ascending order

Calculate unique paths from top-left to bottom-right in an m x n grid

Find the maximum sum of a contiguous subarray in an array of integers

Calculate the minimum number of jumps required to reach the end of an array

Calculate the maximum profit that can be achieved with at most two transactions

Determine the minimum number of coins required to make up a given amount

Calculate the maximum length of a strictly ascending subsequence within a given array

Find the maximum product of any subarray in an integer array

Find the maximum prize you can collect from circular, non-adjacent contest booths

Count the number of ways to decode a numeric string using a given mapping