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There is an undirected star graph consisting of n nodes labeled from 1 to n. A star graph is a graph where there is one center node and exactly n – […]

Given an integer array nums of unique elements, return all possible subsets (the power set). The solution set must not contain duplicate subsets. Return the solution in any order. Example

Given two strings s and t of lengths m and n respectively, return the minimum window substring of s such that every character in t (including duplicates) is included in the window. If there is no

Given an array nums with n objects colored red, white, or blue, sort them in-place so that objects of the same color are adjacent, with the

Given the root of a binary search tree, return a balanced binary search tree with the same node values. If there is more than one

You are climbing a staircase. It takes n steps to reach the top. Each time you can either climb 1 or 2 steps. In how many

Given a string s consisting of words and spaces, return the length of the last word in the string. A word is a maximal substring consisting of non-space

Given the root of a Binary Search Tree (BST), convert it to a Greater Tree such that every key of the original

You are given an array of non-overlapping intervals intervals where intervals[i] = [starti, endi] represent the start and the end of the ith interval and intervals is sorted