Just some notes

Still updating…

The reason I chose hand-writing instead of typing is that, I’ve just finished my High Shcool learning and I’ve been using hand-writing notes for years. It’s more convenient for myself, but maybe not so friendly to others. Sorry about this!

Maybe later in CSC courses I will try to use typing to note, after my $\LaTeX$ learning.

Well, maybe I’ll turn my MAT1001, MAT1002, MAT2041, STA2001 notes to markdown later when I review them before graduate. I think it won’t take a long time and it’s a efficient way to review. The textbooks are boring and the videos are low efficient.

MAT1001 Calculus I

This is the first note I’ve done in CUHKSZ, so it may be a bit messy. The notes later will be more formal and tidy (I guess).

And it has brought me to the very huge world of higher mathematics.

By the way, Thomas’ Calculus is pretty good, especially compared with the traditional Chinese textbooks.

MAT1002 Calculus II

The contin-course of Calculus I. More complicated derivatives and integrals included, and leads to some high-level physics problems.

This notes is the longest note I’ve made in CUHKSZ due to the very large amount of knowledgement of Calculus II. So it’s quite hard to understand every points in it. But as someone says, calculus is not about the formulas, it is about the thoughts behind them.

The learning of calculus should be done when finishing MAT1002, but I still want to learn differential equations in the future class even if it’s not in the requirement courses.

MAT2041 Linear Algebra and Applications

A fundamental course of computer science. The definitions may be a bit complex and hard to remember, but it’ll be much easier when truly understanding the concept behind them. And I strongly recommend 3Blue1Brown’s Linear Algebra to everyone.

STA2001 Probability and Statistics I

A very interesting course, with clear slides. It’s extremely convenient for me to take notes.

It’s kinda simple before mid-term. But after then it’s getting a bit hard, especially the bivariable and n-variable parts.

CSC3001 Discrete Mathematics

One of the fundamental couse of computer science. CUHKSZ’s discrete maths’ slides and markdown notes are excellent. It’s convenient for students to learn by themselves.

Containing logic and set, simple number theory, graph, counting, etc., this course is quite interesting. Mid-term and final-term are not so hard in knowledge, but you need to have a clear mind and strong observation of discrete maths.

I wonder why we don’t have a course about concrete mathametics?

CSC3200 Data Structures and Advanced Programming

Funny course, lol. Started from basic C++ grammar to some data structures, but quite simple for the content. It may be kinda hard for a beginner to learn so, but I’m taken programming contest for years, so not really hard.

I don’t know how to write this course’s notes so I just put on my Assignments, which is some implementation of C++ STL.

The hardest part for final exam is the mysterious C++ grammar like pointers and references. The data structure part is basic. Well, Dr.Chen Ruizhi is not a good guy.

CSC4120 Design and Analysis of Algorithms

Hardest course I’ve learnt so. Even I’m a algorithm programming contester, it still confuse me a lot.

The course cover many parts like D&C, Randomization, Trees, Hash, Graphs, Greedy, DP, Flow, Complexity (NP Problems), Approximation, etc., which really has huge contents in it.

Since I didn’t go to class for once, I can’t judge the professor. But the PPTs, Assignments and Final Project is indeed meaningful.

CSC3060 Introduction to Computer Systems

CSC3170 Database System

CSC4001 Software Engineering

CSC4303 Network Programming

Transform ZIP(jpgs) to PDF

Python Code

Generated by Deepseek

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import os
import zipfile
from PIL import Image
from fpdf import FPDF
import glob

def zip_to_pdf(zip_path, output_folder=None):
    """
    将ZIP文件中的JPG图片合并为PDF
    
    参数:
        zip_path (str): ZIP文件路径
        output_folder (str, optional): 输出PDF的目录，默认为ZIP所在目录
    """
    # 检查ZIP文件是否存在
    if not os.path.exists(zip_path):
        raise FileNotFoundError(f"ZIP文件不存在: {zip_path}")
    
    # 设置输出目录
    if output_folder is None:
        output_folder = os.path.dirname(zip_path)
    
    # 获取ZIP文件名(不带扩展名)
    zip_name = os.path.splitext(os.path.basename(zip_path))[0]
    pdf_path = os.path.join(output_folder, f"{zip_name}.pdf")
    
    # 创建临时目录存放解压文件
    temp_dir = os.path.join(output_folder, f"temp_{zip_name}")
    os.makedirs(temp_dir, exist_ok=True)
    
    try:
        # 解压ZIP文件
        with zipfile.ZipFile(zip_path, 'r') as zip_ref:
            zip_ref.extractall(temp_dir)
        
        # 获取所有JPG文件
        jpg_files = glob.glob(os.path.join(temp_dir, "*.jpg")) + glob.glob(os.path.join(temp_dir, "*.jpeg"))
        
        if not jpg_files:
            raise ValueError("ZIP文件中没有找到JPG图片")
        
        # 按文件名排序
        jpg_files.sort()
        
        # 创建PDF
        pdf = FPDF(unit="pt")  # 使用点(point)作为单位
        
        for jpg_file in jpg_files:
            # 打开图片获取尺寸
            with Image.open(jpg_file) as img:
                width, height = img.size
                
                # 添加新页面并设置尺寸
                pdf.add_page(format=[width, height])
                pdf.image(jpg_file, x=0, y=0, w=width, h=height)
        
        # 保存PDF
        pdf.output(pdf_path)
        print(f"成功创建PDF: {pdf_path}")
        
    finally:
        # 清理临时文件
        import time
        time.sleep(1)  # 等待1秒确保文件被释放
        
        for root, dirs, files in os.walk(temp_dir, topdown=False):
            for name in files:
                file_path = os.path.join(root, name)
                try:
                    os.remove(file_path)
                except PermissionError:
                    print(f"无法删除文件 {file_path}，可能仍被占用")
            for name in dirs:
                os.rmdir(os.path.join(root, name))
        try:
            os.rmdir(temp_dir)
        except OSError:
            print(f"无法删除临时目录 {temp_dir}，可能仍有文件被占用")

if __name__ == "__main__":
    # 示例用法
    zip_file = input("请输入ZIP文件路径: ").strip('"\' ')  # 处理可能的引号
    zip_to_pdf(zip_file)