Shichao An shichao-an
shichao-an
/ gist:8992bd6e03582dc474f5d86b6b2aa440
Last active
March 29, 2019 02:43
— forked from psayre23/gist:c30a821239f4818b0709
Runtime Complexity of Java Collections
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| 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
/ vpnsetup.sh
Last active
August 29, 2015 14:11
— forked from hwdsl2/.MOVED.md
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #!/bin/sh | |
| # | |
| # Amazon EC2 user-data file for automatic configuration of IPsec/L2TP VPN | |
| # on a Ubuntu server instance. Tested with 14.04 (Trusty) AND 12.04 (Precise). | |
| # With minor modifications, this script *can also be used* on dedicated servers | |
| # or any KVM- or XEN-based Virtual Private Server (VPS) from other providers. | |
| # | |
| # DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC! THIS IS MEANT TO BE RUN WHEN | |
| # YOUR AMAZON EC2 INSTANCE STARTS! | |
| # |