Blind 75 / NeetCode 150 / Grind 169

Write a function that takes the binary representation of an unsigned integer and returns the number of '1' bits it has (also known as the…

Given two integers a and b, return the sum of the two integers without using the operators + and -.

Given head, the head of a linked list, determine if the linked list has a cycle in it.

There is a robot on an m x n grid. The robot is initially located at the top-left corner (i.e., grid[0][0]). The robot tries to move to the…

You are given a large integer represented as an integer array digits, where each digits[i] is the ith digit of the integer. The digits are…

Given an array nums containing n distinct numbers in the range [0, n], return the only number in the range that is missing from the array.

There are a total of numCourses courses you have to take, labeled from 0 to numCourses - 1. You are given an array prerequisites where…

Given an integer array nums, return the length of the longest strictly increasing

Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.

Given an integer array nums, find a

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

Given a string s and a dictionary of strings wordDict, return true if s can be segmented into a space-separated sequence of one or more…

Given an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order.

Given an integer array nums of unique elements, return all possible