isaacs

echo 'export PATH=$HOME/local/bin:$PATH' >> ~/.bashrc
. ~/.bashrc
mkdir ~/local
mkdir ~/node-latest-install
cd ~/node-latest-install
curl http://nodejs.org/dist/node-latest.tar.gz | tar xz --strip-components=1
./configure --prefix=~/local
make install # ok, fine, this step probably takes more than 30 seconds...
curl https://www.npmjs.org/install.sh | sh

OpenGrid

/* http://blog.codility.com/2012/06/sigma-2012-codility-programming.html */

function stone_wall ( H ) {
    var blocks = 0, stack = [], m, stack_length = 0;
    
    for(m in H) {        
        // I use stack to remember all previous skyline levels
        while(stack_length > 0 && stack[stack_length - 1] > H[m]) {
            stack_length -= 1;
            blocks += 1;