Here is a difficulty and frequency distribution chart for each problem (which I got from the Internet and is very useful). Dynamic Programming Edit Distance Maximum Subarray Minimum Path Sum Unique Paths Unique Paths II Longest Palindromic Substring…

2.2Organizing Qualitative Data The number of times a particular distinct value occurs is called its frequency (or count) Relative-Frequency Distribution:百分比 Note: Relative-frequency distributions are better than frequency distributions for comparing…

分析 写bash,不太会啊…… 难度 中 来源 https://leetcode.com/problems/word-frequency/ 题目 Write a bash script to calculate the frequency of each word in a text file words.txt. For simplicity sake, you may assume: words.txt contains only lowercase characters and space…

Implement FreqStack, a class which simulates the operation of a stack-like data structure. FreqStack has two functions: push(int x), which pushes an integer xonto the stack. pop(), which removes and returns the most frequent element in the stack. If…

题目链接:https://leetcode.com/problems/maximum-frequency-stack/ 题意:实现一种数据结构FreqStack,FreqStack需要实现两个功能: push(int x) : 将x放入栈中 pop(): 移除并返回栈中出现次数最多的元素,若果该元素不唯一,返回离栈顶最近的 思路:维护一个set,set中存储元素值,以及一个包含该元素在原栈中的出现次序的栈,排序先按照set中栈的大小排序,栈大小相同则按照栈顶元素大小排序.push若该元素不在se…

使用Boltzmann distribution还是Gibbs distribution作为题目纠结了一阵子,选择前者可能只是因为听起来“高大上”一些.本章将会聊一些关于信息.能量这方面的东西,体会“交叉学科”的魅力. In statistical mechanics and mathematics, a Boltzmann distribution (also called Gibbs distribution) is a probability distribution, probabili…

Inferential Statistics Generalizing from a sample to a population that involves determining how far sample statistics are likely to vary from each other and from the population parameter. Sampling Distribution The sampling distribution of a statistic…

A Complete Tutorial to Learn Data Science with Python from Scratch Introduction It happened few years back. After working on SAS for more than 5 years, I decided to move out of my comfort zone. Being a data scientist, my hunt for other useful tools w…

GV900 Political Explanation, 2017/201830 October, 2018Homework assignment 2Due Week 7 (13 November)Write an R code file named (gv900-HW2.R) to complete the following tasks. The easiestway to write an R code file is to start with an existing file: Dup…

Introduction In accordance with the definition of instantaneous sound intensity as the product of the instantaneous acoustic pressure and the instantaneous particle velocity, an intensity measurement system should incorporate transducers of each of t…