Tech | 技术笔记

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. 思路： 这道题不难，用binary search 1-x就行，有…

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”,…

LeetCode上的相关题目(easy) 155, 225, 232, 346 常用方法 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…