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Determine if two strings are anagrams of each other, meaning they contain the exact same characters with the same frequencies but possibly in different orders.

Given an array of integers and a target sum, find the indices of two numbers in the array that add up to the target value. Each input has exactly one solution,

Find two numbers in a sorted array that add up to a specific target value, returning their 1-indexed positions.

Given an array of integers and a number k, return the k most frequently occurring elements in the array.

Design a time-based key-value data structure that can store multiple values for the same key at different timestamps and retrieve the value associated with a ke

Given an integer array nums and a target integer, find the number of ways to assign ''+'' or ''-'' signs to each element so that the sum equals the target.

Find the minimum time required to swim from the top-left corner to the bottom-right corner of a grid, where each cell has a water level and you can only move wh

Calculate the sum of two integers without using the + or - operators, implementing addition using only bitwise operations.

Given the roots of two binary trees, determine if the second tree (subRoot) is a subtree of the first tree (root). A subtree must include all descendants of a n

Given an integer array that may contain duplicates, return all possible subsets (the power set) without duplicate subsets in the result.

Given an m x n matrix, return all elements of the matrix in spiral order, starting from the top-left corner and moving clockwise through each layer.

Given an array of integers where every element appears twice except for one, find the single element that appears only once. The solution must run in linear tim

Given an m x n matrix, if an element is 0, set its entire row and column to 0. The modification must be done in-place.

Given a 2D matrix where each row is sorted in ascending order and the first integer of each row is greater than the last integer of the previous row, determine

Given the roots of two binary trees p and q, determine if they are the same tree. Two binary trees are considered the same if they are structurally identical an

Given an n x n 2D matrix representing an image, rotate the image by 90 degrees clockwise in-place without using extra space.

Given the head of a linked list, reverse the nodes of the list k at a time, returning the modified list. If the number of remaining nodes is not a multiple of k

Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer range, return 0.

Given a 32-bit unsigned integer, reverse the bits and return the resulting integer.

Given a string s and a pattern p, implement regular expression matching with support for ''.'' and ''*'' where ''.'' matches any single character and ''*'' matc

Given a list of airline tickets represented as pairs of departure and arrival airports, return the itinerary in order starting from JFK, using all tickets exact

Implement a function to calculate x raised to the power n (x^n) efficiently. The function should handle both positive and negative exponents and return the resu

Given a non-empty array of decimal digits representing a non-negative integer, increment the integer by one and return the resulting digits as an array.

Given two strings s1 and s2, return true if s2 contains a permutation of s1. A permutation is a rearrangement of characters, so we need to find if any substring