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Array

• Two Sum
• Best Time to Buy and Sell Stock
• Contains Duplicate
• Product of Array Except Self
• Maximum Subarray
• Maximum Product Subarray
• Find Minimum in Rotated Sorted Array

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Installation Guide

OPENCV

OpenCV 2.4.13

To install

cd ~

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System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

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import argparse
import torch
import torch.nn as nn
from torch.autograd import Variable
from torch.utils.data import DataLoader

import torchvision
import torchvision.transforms as T
from torchvision.datasets import ImageFolder

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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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// the solution by StefanPochmann https://leetcode.com/problems/swap-nodes-in-pairs/discuss/11019/7-8-lines-C++-Python-Ruby 
ListNode* swapPairs(ListNode* head) {
    ListNode **pp = &head, *a, *b;
    while ((a = *pp) && (b = a->next)) {
        a->next = b->next;
        b->next = a;
        *pp = b;
        pp = &(a->next);
    }
    return head;

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index=1
# ls -rt means list in the order of oldest first 
for i in $(ls *.pdf -rt)
do
    cp "${i}" "${index}_${i}"
    index=$((index+1))
done

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#!/usr/bin/env python

"""
Download all the pdfs linked on a given webpage
Revised from the original author elssar's gist (https://gist.github.com/elssar/5160757) to scrap the pdf links in piazza resources
tab, the original script is for the websits don't need login. But you have
to login piazza to scape the contents. So I revised the request.post with
authentification info and turn the program to run with Python3
Usage -
    python grab_pdfs.py url <path/to/directory>

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In this article, I will share some of my experience on installing NVIDIA driver and CUDA on Linux OS. Here I mainly use Ubuntu as example. Comments for CentOS/Fedora are also provided as much as I can.

Table of Contents

• Install NVIDIA Graphics Driver via apt-get
• Install NVIDIA Graphics Driver via runfile
  • Remove Previous Installations (Important)
  • Download the Driver
  • Install Dependencies
  • Creat Blacklist for Nouveau Driver

• Stop lightdm/gdm/kdm