Given the root node of a binary tree and an integer targetSum, return true if the tree has a path from root-to-leaf such that the sum of all

Given string s, return true if it is possible to make s a palindrome by removing at-most one character from s. A string is a palindrome if

Given a string s, return true if it is a palindrome, otherwise return false. A given sentence is a palindrome if, after converting all

Given an integer array nums, every element in nums appears exactly twice except for two numbers that appear only once. Find these two number

Given a non-empty array of unsorted integers nums, every element in nums appears twice except for one. Find that single number.

Given a input string text, use the characters of text to form as many instances of the word "balloon" as possible. You are only allowed to