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https://developer.amazon.com/public/solutions/platforms/android-fireos 

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Now go to your Fire TV.
Settings > About > Check For System Update
IMG_9956

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Snapsack problem refers to the situation you want to find a combination of items that can fill up a container. Each items should be attached with a value, and there should be a target value that means a container is filled up. For example, a container has 25 spaces and there are items that will take 1, 5, 7, 6, 4 or 10 spaces. You have to find all the combinations that fit the container.

Unable to install Homebrew with this?

ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"

What’s happened

-e:70: warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
==> This script will install:
/usr/local/bin/brew
/usr/local/Library/...
/usr/local/share/man/man1/brew.1

Press RETURN to continue or any other key to abort
==> /usr/bin/sudo /bin/chmod g+rwx /Library/Caches/Homebrew
Password:
==> Downloading and installing Homebrew...
remote: Counting objects: 192274, done.
remote: Compressing objects: 100% (52298/52298), done.
remote: Total 192274 (delta 138823), reused 192246 (delta 138803)
Receiving objects: 100% (192274/192274), 38.59 MiB | 189 KiB/s, done.
Resolving deltas: 100% (138823/138823), done.
From https://github.com/Homebrew/homebrew
 * [new branch]      master     -> origin/master
error: unable to unlink old 'Library/Aliases/0mq' (Permission denied)
error: unable to unlink old 'Library/Aliases/4store' (Permission denied)
error: unable to unlink old 'Library/Aliases/Secret Rabbit Code' (Permission denied)
error: unable to unlink old 'Library/Aliases/ag' (Permission denied)
error: unable to unlink old 'Library/Aliases/alut' (Permission denied)
error: unable to unlink old 'Library/Aliases/android' (Permission denied)
error: unable to unlink old 'Library/Aliases/apache-activemq' (Permission denied)
error: unable to unlink old 'Library/Aliases/apache-fop' (Permission denied)
error: unable to unlink old 'Library/Aliases/aws-as' (Permission denied)
error: unable to unlink old 'Library/Aliases/aws-mon' (Permission denied)
error: unable to unlink old 'Library/Aliases/beanstalkd' (Permission denied)
error: unable to unlink old 'Library/Aliases/bjam' (Permission denied)
error: unable to unlink old 'Library/Aliases/boehmgc' (Permission denied)
error: unable to unlink old 'Library/Aliases/boost-jam' (Permission denied)
error: unable to create symlink Library/Aliases/boot2docker-cli (Permission denied)
error: unable to unlink old 'Library/Aliases/bzr' (Permission denied)
error: unable to unlink old 'Library/Aliases/cowthink' (Permission denied)
error: unable to unlink old 'Library/Aliases/cpanm' (Permission denied)
error: unable to unlink old 'Library/Aliases/csvfix' (Permission denied)
error: unable to unlink old 'Library/Aliases/ctags-exuberant' (Permission denied)
error: unable to unlink old 'Library/Aliases/db' (Permission denied)
error: unable to unlink old 'Library/Aliases/dbus' (Permission denied)
error: unable to unlink old 'Library/Aliases/dejagnu' (Permission denied)
error: unable to unlink old 'Library/Aliases/eyeD3' (Permission denied)
error: unable to unlink old 'Library/Aliases/fastcgi' (Permission denied)
error: unable to unlink old 'Library/Aliases/fishfish' (Permission denied)
error: unable to unlink old 'Library/Aliases/fluidsynth' (Permission denied)
error: unable to unlink old 'Library/Aliases/gearmand' (Permission denied)
error: unable to unlink old 'Library/Aliases/git-tig' (Permission denied)
error: unable to unlink old 'Library/Aliases/gnu-scientific-library' (Permission denied)
error: unable to unlink old 'Library/Aliases/google-go' (Permission denied)
error: unable to unlink old 'Library/Aliases/gperftools' (Permission denied)
error: unable to unlink old 'Library/Aliases/gpg' (Permission denied)
error: unable to unlink old 'Library/Aliases/gpg2' (Permission denied)
error: unable to unlink old 'Library/Aliases/gs' (Permission denied)
error: unable to unlink old 'Library/Aliases/gtk' (Permission denied)
error: unable to unlink old 'Library/Aliases/gtypist' (Permission denied)
error: unable to unlink old 'Library/Aliases/hashdeep' (Permission denied)
error: unable to unlink old 'Library/Aliases/heroku' (Permission denied)
error: unable to unlink old 'Library/Aliases/hg' (Permission denied)
error: unable to unlink old 'Library/Aliases/htop' (Permission denied)
error: unable to unlink old 'Library/Aliases/hudson' (Permission denied)
error: unable to unlink old 'Library/Aliases/ipsum' (Permission denied)
error: unable to unlink old 'Library/Aliases/jocr' (Permission denied)
error: unable to unlink old 'Library/Aliases/lcms' (Permission denied)
error: unable to unlink old 'Library/Aliases/lcms2' (Permission denied)
error: unable to unlink old 'Library/Aliases/leg' (Permission denied)
error: unable to unlink old 'Library/Aliases/libcryptopp' (Permission denied)
error: unable to unlink old 'Library/Aliases/libgd' (Permission denied)
error: unable to unlink old 'Library/Aliases/libgeoip' (Permission denied)
error: unable to unlink old 'Library/Aliases/libjpeg' (Permission denied)
error: unable to unlink old 'Library/Aliases/libjpeg-turbo' (Permission denied)
error: unable to unlink old 'Library/Aliases/libjpg' (Permission denied)
error: unable to unlink old 'Library/Aliases/liblabjackusb' (Permission denied)
error: unable to unlink old 'Library/Aliases/libmad' (Permission denied)
error: unable to unlink old 'Library/Aliases/libmcrypt' (Permission denied)
error: unable to unlink old 'Library/Aliases/libnettle' (Permission denied)
error: unable to unlink old 'Library/Aliases/liboggz' (Permission denied)
error: unable to unlink old 'Library/Aliases/libqrencode' (Permission denied)
error: unable to unlink old 'Library/Aliases/libtag' (Permission denied)
error: unable to unlink old 'Library/Aliases/libtasn' (Permission denied)
error: unable to unlink old 'Library/Aliases/libtcnative' (Permission denied)
error: unable to unlink old 'Library/Aliases/littlecms' (Permission denied)
error: unable to unlink old 'Library/Aliases/mc' (Permission denied)
error: unable to unlink old 'Library/Aliases/mediainfo' (Permission denied)
error: unable to unlink old 'Library/Aliases/mongo' (Permission denied)
error: unable to unlink old 'Library/Aliases/mosh' (Permission denied)
error: unable to unlink old 'Library/Aliases/mp4box' (Permission denied)
error: unable to unlink old 'Library/Aliases/mpich' (Permission denied)
error: unable to unlink old 'Library/Aliases/myrepos' (Permission denied)
error: unable to unlink old 'Library/Aliases/node.js' (Permission denied)
error: unable to unlink old 'Library/Aliases/nodejs' (Permission denied)
error: unable to unlink old 'Library/Aliases/npm' (Permission denied)
error: unable to unlink old 'Library/Aliases/nsis' (Permission denied)
error: unable to unlink old 'Library/Aliases/o-caml' (Permission denied)
error: unable to unlink old 'Library/Aliases/ocaml' (Permission denied)
error: unable to unlink old 'Library/Aliases/ocio' (Permission denied)
error: unable to unlink old 'Library/Aliases/offlineimap' (Permission denied)
error: unable to unlink old 'Library/Aliases/ooc' (Permission denied)
error: unable to unlink old 'Library/Aliases/openmpi' (Permission denied)
error: unable to unlink old 'Library/Aliases/openocd' (Permission denied)
error: unable to unlink old 'Library/Aliases/pgrep' (Permission denied)
error: unable to unlink old 'Library/Aliases/pipeviewer' (Permission denied)
error: unable to unlink old 'Library/Aliases/pkgconfig' (Permission denied)
error: unable to unlink old 'Library/Aliases/pkill' (Permission denied)
error: unable to unlink old 'Library/Aliases/pocketsphinx' (Permission denied)
error: unable to unlink old 'Library/Aliases/postgres' (Permission denied)
error: unable to create symlink Library/Aliases/pt (Permission denied)
error: unable to unlink old 'Library/Aliases/qt4' (Permission denied)
error: unable to unlink old 'Library/Aliases/shell-fm' (Permission denied)
error: unable to unlink old 'Library/Aliases/slang' (Permission denied)
error: unable to unlink old 'Library/Aliases/sphinxbase' (Permission denied)
error: unable to unlink old 'Library/Aliases/sqlite3' (Permission denied)
error: unable to unlink old 'Library/Aliases/stax-sdk' (Permission denied)
error: unable to unlink old 'Library/Aliases/style' (Permission denied)
error: unable to unlink old 'Library/Aliases/svn' (Permission denied)
error: unable to unlink old 'Library/Aliases/tinyfugue' (Permission denied)
error: unable to create symlink Library/Aliases/twemproxy (Permission denied)
error: unable to unlink old 'Library/Aliases/twolame' (Permission denied)
error: unable to unlink old 'Library/Aliases/unix2dos' (Permission denied)
error: unable to unlink old 'Library/Aliases/urxvt' (Permission denied)
error: unable to unlink old 'Library/Aliases/usb-multiplex-daemon' (Permission denied)
error: unable to create symlink Library/Aliases/vid.stab (Permission denied)
error: unable to unlink old 'Library/Aliases/wxwidgets' (Permission denied)
error: unable to unlink old 'Library/Aliases/xmlsec1' (Permission denied)
error: unable to unlink old 'Library/Aliases/zmq' (Permission denied)
error: unable to unlink old 'Library/Contributions/brew_bash_completion.sh' (Permission denied)
error: unable to unlink old 'Library/Contributions/brew_fish_completion.fish' (Permission denied)
error: unable to unlink old 'Library/Contributions/brew_zsh_completion.zsh' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-aspell-dictionaries.rb' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-beer.rb' (Permission denied)
error: unable to create file Library/Contributions/cmd/brew-bundle-dir.rb (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-bundle.rb' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-cleanup-installed' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-gist-logs.rb' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-graph' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-man' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-profile.rb' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-pull.rb' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-server' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-services.rb' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-switch.rb' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-tap-readme.rb' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-test-bot.rb' (Permission denied)
error: unable to create file Library/Contributions/cmd/brew-versions.rb (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/brew-which.rb' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/git' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/public/bootstrap.min.css' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/public/glyphicons-halflings-white.png' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/public/glyphicons-halflings.png' (Permission denied)
error: unable to unlink old 'Library/Contributions/cmd/svn' (Permission denied)
error: unable to unlink old 'Library/Contributions/example-formula.rb' (Permission denied)
error: unable to unlink old 'Library/Contributions/manpages/brew.1.md' (Permission denied)
error: unable to unlink old 'Library/ENV/3.2.6' (Permission denied)
error: unable to unlink old 'Library/ENV/4.2' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/ant' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/apr-1-config' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/bsdmake' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/c++' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/c89' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/c99' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/cc' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/clang' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/clang++' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/cpp' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/g++' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/g++-4.2' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/g++-4.3' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/g++-4.4' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/g++-4.5' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/g++-4.6' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/g++-4.7' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/g++-4.8' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/g++-4.9' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/gcc' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/gcc-4.2' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/gcc-4.3' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/gcc-4.4' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/gcc-4.5' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/gcc-4.6' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/gcc-4.7' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/gcc-4.8' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/gcc-4.9' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/git' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/gmake' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/i686-apple-darwin11-llvm-g++-4.2' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/i686-apple-darwin11-llvm-gcc-4.2' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/ld' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/llvm-g++' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/llvm-g++-4.2' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/llvm-gcc' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/llvm-gcc-4.2' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/make' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/mig' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/pod2man' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/sed' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/svn' (Permission denied)
error: unable to unlink old 'Library/ENV/4.3/xcrun' (Permission denied)
fatal: cannot create directory at 'Library/ENV/pkgconfig/10.10': Permission denied
Failed during: git reset --hard origin/master

Reason

Probably you have multiple users on your computer. And you uninstalled the old Homebrew and trying to re-install it.

Solution

Theorotically you can remove the directory /usr/local/Library but this will happens again when you try to use Homebrew with another user. It is better to change the permission of directory with this:

sudo chmod -R 775 /usr/local/Library

and after a successful install, you better fix the permission for another directory. This directory may appear after you run some ruby commands.

sudo chmod -R 775 /usr/local/Cellar

 

Question

You have 9 marbles. 8 marbles weigh 1 ounce each, & one marble weighs 1.5 ounces. You are unable to determine which is the heavier marble by looking at them. You have a weighing scale that consists of 2 pans, but the scale is only good for 2 total weighings. How can you determine which marble is the heaviest one using the scale & in 2 weighings?

Solution

1. Divide 9 marbles into 3 groups of 3 marbles each.

2. Take any 2 groups and place them on each pan. If they balance, remove the marbles from the pans, & place any 2 of the marbles from the remaining un-weighed group on the pans, 1 on each pan.

2.1. If one is heavier, it is the heavier marble, but if they balance, the remaining un-weighed marble is the heavier one.

2.2. If your first weighing does not balance, the heavier pan has the heavy marble.

3. Remove the marbles from the lighter pan, & place 1 marble on each pan from the heavier pan.

3.1. The heavier 1 is the 1.5 ounce marble.

3.2. But if they balance, then the marble from the heavy pan from the first weighing that was not weighed in the second weighing is the heavy one.

Question

Write an algorithm to remove duplicated node from a linked list.

Solution

There are many ways to do it. For the first one, as the simplest one, we could use 2 loops to compare each element with all other elements. However, this takes forever: O(n²).

The second way

Reference

http://www.geeksforgeeks.org/remove-duplicates-from-an-unsorted-linked-list/

Question

Sum up 1 to n without using division, multiplication, for loop, while loop, if else, switch and condition statement (A?B:C).

Solution 1

Actually, for loop can be simulated through making use of the static property. Since static value will be stored in the class, we can increase the value every time we init a static class.

#include <iostream.h>

class Temp
{
public:
    Temp() {
        ++N;
        Sum += N;
    }
    static void Reset() { N = 0; Sum = 0; }
    static int GetSum() { return Sum; }

private:
    static int N;
    static int Sum;
};

int Temp::N = 0;
int Temp::Sum = 0;

int solution1_Sum(int n)
{
    Temp::Reset();
    Temp *a = new Temp[n];   //就是这个意思,new出n个数组。
    delete []a;
    a = 0;
    return Temp::GetSum();
}

int main()
{
    cout<<solution1_Sum(100)<<endl;
    return 0;
}

//运行结果:
//5050
//Press any key to continue

Solution 2

既然不能判断是不是应该终止递归,我们不妨定义两个函数。
一个函数充当递归函数的角色,另一个函数处理终止递归的情况,
我们需要做的就是在两个函数里二选一。

从二选一我们很自然的想到布尔变量,
比如ture/(1)的时候调用第一个函数,false/(0)的时候调用第二个函数。
那现在的问题是如和把数值变量n转换成布尔值。

如果对n连续做两次反运算,即!!n,那么非零的n转换为true,0转换为false。

#include <iostream.h>

class A;
A* Array[2];

class A
{
public:
    virtual int Sum (int n) { return 0; }
};

class B: public A
{
public:
    virtual int Sum (int n) { return Array[!!n]->Sum(n-1)+n; }
};

int solution2_Sum(int n)
{
    A a;
    B b;
    Array[0] = &a;
    Array[1] = &b;
    int value = Array[1]->Sum(n);
    //利用虚函数的特性,当Array[1]为0时,即Array[0] = &a; 执行A::Sum,
    //当Array[1]不为0时,即Array[1] = &b; 执行B::Sum。
    return value;
}

int main()
{
    cout<<solution2_Sum(100)<<endl;
    return 0;
}

//5050
//Press any key to continue

 

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