Chun-Hung Tseng henrybear327

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

RTAI installation for ubuntu 14.04

Preparation

Switch user mode

sudo su

download and unzip

Launch Sublime Text 2 from the Mac OS X Terminal

Sublime Text 2 ships with a CLI called subl (why not "sublime", go figure). This utility is hidden in the following folder (assuming you installed Sublime in /Applications like normal folk. If this following line opens Sublime Text for you, then bingo, you're ready.

open /Applications/Sublime\ Text\ 2.app/Contents/SharedSupport/bin/subl

You can find more (official) details about subl here: http://www.sublimetext.com/docs/2/osx_command_line.html

	#include <stdio.h>
	#include <set>
	#include <string>

	using namespace std;

	int m[5][5];

	inline bool inBound(int x, int y)
	{

	#include <bits/stdc++.h>
	using namespace std;

	typedef long long ll;
	ll gcd(ll a, ll b) {
	if (b == 0)
	return a;
	return gcd(b, a % b);
	}

	#include <bits/stdc++.h>

	using namespace std;

	int main()
	{
	int ncase;
	scanf("%d", &ncase);

	while(ncase--) {

	def lowerBound(a, key)
	lb = -1; ub = a.length
	while ub - lb > 1
	mid = (lb + ub) / 2
	if a[mid] >= key
	ub = mid
	else
	lb = mid
	end
	end

	#include <bits/stdc++.h>

	using namespace std;

	vector<int> g[26];
	bool has[26];
	int tree, acorn;
	bool has_cycle, visited[26];

	void dfs(int u, int par)

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

	int main()
	{
	int tmp, globalmax = 0, suffixmax = 0;
	while (scanf("%d", &tmp) != EOF) {
	if (suffixmax + tmp > globalmax) {
	suffixmax += tmp;
	globalmax = suffixmax;

	/*
	Infix to postfix conversion in C++
	Input Postfix expression must be in a desired format.
	Operands and operator, both must be single character.
	Only '+' , '-' , '*', '/' and '$' (for exponentiation) operators are expected.
	*/
	#include<iostream>
	#include<stack>
	#include<string>