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@millermedeiros
millermedeiros / gist:891886
Created March 29, 2011 06:21
iPad HTML5 video quirks and hacks
/*
* Example how to preload HTML5 video on the iPad (iOS 3.2+)
* @author Miller Medeiros
* Released under WTFPL
*/
var vid = document.createElement('video');
vid.src = 'lol_catz.mp4';
document.getElementById('video-holder').appendChild(vid);
@christophermanning
christophermanning / README.md
Last active March 30, 2023 04:24
Voronoi Diagram with Force Directed Nodes and Delaunay Links

Created by Christopher Manning

Summary

Nodes are linked to nodes in neighboring cells. The cell's color is a function of its area.

The white lines are the Delaunay triangulation and the purple cells are the Voronoi diagram.

Controls

@jboner
jboner / latency.txt
Last active July 23, 2024 14:12
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD
@viktorklang
viktorklang / Future-retry.scala
Last active July 23, 2023 23:48
Asynchronous retry for Future in Scala
import scala.concurrent.duration._
import scala.concurrent.ExecutionContext
import scala.concurrent.Future
import akka.pattern.after
import akka.actor.Scheduler
/**
* Given an operation that produces a T, returns a Future containing the result of T, unless an exception is thrown,
* in which case the operation will be retried after _delay_ time, if there are more possible retries, which is configured through
* the _retries_ parameter. If the operation does not succeed and there is no retries left, the resulting Future will contain the last failure.
@Centaur
Centaur / CommaSeperatedData.scala
Created October 31, 2014 04:08
dynamically run scala code
import tools.nsc.interpreter.IMain
import tools.nsc.Settings
object CommaSeperatedData extends App {
val data = """ "Doe, John", 35, 225, "5'10\"", "555-0123" """
val settings = new Settings
settings.usejavacp.value = true
val n = new IMain(settings)
n.interpret("List(" + data + ")")
@Centaur
Centaur / egret.scala
Last active August 29, 2015 14:09
forEgret
def name2id1(name: String): Option[String] = name match {
case "name1" => Some("id1")
case "name2" => Some("id2")
case "name3" => Some("id3")
case _ => None
}
def name2id2(name: String): Option[String] = name match {
case "name1" => None
case "name2" => Some("id2")
case "name3" => Some("id3")
@rklaehn
rklaehn / Proxy.scala
Created January 31, 2015 16:29
Minimal akka http proxy
package akkahttptest
import akka.actor.ActorSystem
import akka.http.Http
import akka.stream.FlowMaterializer
import akka.http.server._
import akka.http.marshalling.PredefinedToResponseMarshallers._
import akka.stream.scaladsl.{HeadSink, Source}
object Proxy extends App {
@craigminihan
craigminihan / gist:b23c06afd9073ec32e0c
Last active September 21, 2023 12:47
Build GCC 4.9.2 for C/C++ on CentOS 7
sudo yum install libmpc-devel mpfr-devel gmp-devel
cd ~/Downloads
curl ftp://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/releases/gcc-4.9.2/gcc-4.9.2.tar.bz2 -O
tar xvfj gcc-4.9.2.tar.bz2
cd gcc-4.9.2
./configure --disable-multilib --enable-languages=c,c++
make -j 4
make install

计算一组Range所覆盖的不重复整数的个数,求 < O(n*n) 的算法。

def cover(rs: Range*):Int = ???


assert(cover(0 to 4, 1 to 5) == 6)
assert(cover(0 to 4, 1 to 3) == 5)
assert(cover(0 to 4, 6 to 7) == 7)
assert(cover(0 to 4, 6 to 7, 2 to 6) == 8)
package com.gtan.turing
import akka.shapeless.HNil
import org.parboiled2._
import scala.util.Try
/**
* Created by zhang on 2015/7/14.
*/