Technical Notes

Winter is coming! Your first job during the contest is to design a standard heater with fixed warm r…

Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the follo…

Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the follo…

Given a positive integer num, write a function which returns True if num is a perfect square else Fa…

We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to gues…

You are a product manager and currently leading a team to develop a new product. Unfortunately, the …

Implement `int sqrt(int x)`. Compute and return the square root of `x`. Approach: This problem isn't difficult; a binary search of 1-x will suffice…

A peak element is an element that is greater than its neighbors. Given an input array where num[i] ≠…

Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), pro…

Given a linked list, return the node where the cycle begins. If there is no cycle, return null. Note…

Given an array of strings, group anagrams together. For example, given: [“eat”, “tea”, “tan”, “ate”,…

Related LeetCode problems (easy): 155, 225, 232, 346. Common methods: Stack: push(), pop(), peak(), empty(); Queue (LinkedList)...

Given a stream of integers and a window size, calculate the moving average of all integers in the sl…

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

Implement the following operations of a stack using queues. push(x) — Push element x onto stac…