## One Integer

You are given a list of integers nums. You can reduce the length of nums by taking any two integers, removing them, and appending their sum to the end. The c...

You are given a list of integers nums. You can reduce the length of nums by taking any two integers, removing them, and appending their sum to the end. The c...

Given a list of positive integers nums, return the number of integers that have odd number of digits.

Given a lowercase alphabet string s, return the total number of substrings that contain one unique character.

Given a list of integers nums and an integer target, return the number of sublists whose sum is equal to target.

Given an integer n, return the number of 1 bits in n.

The Fibonacci sequence goes like this: 1, 1, 2, 3, 5, 8, 13, 21, 34, …

You are given a string s containing lowercase and uppercase alphabet characters as well as digits from "0" to "9". Return whether s is a palindrome if we onl...

You are given a binary tree root containing unique values, and an integer target. Find the node with value target and return the node that’s directly right o...

Given an integer n, return whether it is equal to the sum of its own digits raised to the power of the number of digits.

You’ve got an integer n representing a chessboard of size n x n. Return the number of ways you can place n rooks, such that no two rooks attack each other.

You are given a two-dimensional list of integers relations. Each element relations[i] contains [a, b] meaning that person a is following person b on Twitter.

You are given a list of list of integers intervals where each element contains the inclusive interval [start, end].