shichao-an

Below are the Big O performance of common functions of different Java Collections.


List                 | Add  | Remove | Get  | Contains | Next | Data Structure
---------------------|------|--------|------|----------|------|---------------
ArrayList            | O(1) |  O(n)  | O(1) |   O(n)   | O(1) | Array
LinkedList           | O(1) |  O(1)  | O(n) |   O(n)   | O(1) | Linked List
CopyOnWriteArrayList | O(n) |  O(n)  | O(1) |   O(n)   | O(1) | Array

shichao-an

<plist version="1.0">
<dict>
   <key>Label</key>
   <string>com.user.loginscript</string>
   <key>ProgramArguments</key>
   <array>
   <string>/bin/mkdir</string>
   <string>-p</string>
   <string>/private/tmp/Downloads</string>
   </array>

shichao-an

#
# /etc/pam.d/common-password - password-related modules common to all services
#
# This file is included from other service-specific PAM config files,
# and should contain a list of modules that define the services to be
# used to change user passwords.  The default is pam_unix.

# Explanation of pam_unix options:
#
# The "sha512" option enables salted SHA512 passwords.  Without this option,

shichao-an

#!/bin/bash


ebs_disk="/dev/xvdf"
ebs_partition="/dev/xvdf1"
vg_name="vg"
pv_name="pv1"
mount_point="/mnt"

# Create a primary partition on $ebs_disk using all space

shichao-an

# ldapadd -Y EXTERNAL -H ldapi:/// -f ldap_disable_bind_anon.ldif
dn: cn=config
changetype: modify
add: olcDisallows
olcDisallows: bind_anon

dn: cn=config
changetype: modify
add: olcRequires
olcRequires: authc

shichao-an

Amazon
Microsoft
Facebook
Google
LinkedIn
Twitter
Apple
Zenefits
Uber
Airbnb

shichao-an

• cringe (vi.) 畏缩; 感到难堪
• antics (n.) 滑稽的举止
• nuts and bolts (n.) 基础部分; (adj.) 有关具体细节的
• innuendo (n.) 暗示; 影射
• demoralize (vt.) 使泄气
• endearment (n.) 爱慕
• outnumber (vt.) 在数量上超过
• drool (vi.) 淌口水; 垂涎
• chastise (vt.) 责备
• whine (vt.) 哭喊

shichao-an

• noob (n.) 新手 (a person who is inexperienced in a particular sphere or activity, especially computing or the use of the Internet.)
• calamitous (adj.) 灾难性的
• swamp (vt.) 淹没; 使…应接不暇; 使…人满为患
• layman/layperson (n.) (non-expert) 外行
• necessitate (vt.) 使成为必要
• warrant (vt.) 证明…正当 (justify); 使成为必要 (necessitate); 为...作担保
• instrumental (adj.) to be instrumental in [something]/doing [something] 对某事物/对做某事起重要作用 (to have important role)
• stagnant (adj.) (sluggish) 停滞的; 不景气的
• reap (vt.) 获得
• weigh (vt.) 权衡; 衡量 (vt.) 有影响 (have influence) (exp. to weigh heavily/very little with [somebody] 对某人影响很大/很小)

shichao-an

#include <stdio.h>
#include <stdlib.h>

#define test(x) ({ \
    typeof(x) _x = (x); \
    _x += 1; \
    _x; \
})

int main(int argc, char* argv[])

shichao-an

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char * argv[])
{
    struct
    {
        bool a: 1;
        bool b: 1;