MPCA #1

l4.js

var count = {};

var array = ["str1", "str2", "string 3", "string 4", "s5", "string 4", "s5", "str2", "string 3", "string 4", "s5", "string 4", "str1"];

for(var i = 0; i < array.length; i++) {
	if(count[array[i]]) {
		count[array[i]]++;
	}
	else {
		count[array[i]] = 1;
	}
}
console.log(count);

l5.py

count = {}

a = "str1", "str2", "string 3", "string 4", "s5", "string 4", "s5", "str2", "string 3", "string 4", "s5", "string 4", "str1"

for x in a:
	if x in count:
		count[x] = count[x] + 1
	else:
		count[x] = 1

print count

l6.js

/*
How to use: 
node l6.js

Then use the command line to put the input

Link:
http://htl.reneheinzl.net/htl_contest_prog.html

*/
//status variables
var dataSets = -1;
var currentSet = -1;

var meta;
var readMeta = false;

var conversionData;
var readConversion = false;

var setData;
var dataLinesRead = -1;

//smallest el in array
function min(a) {
	var min = a[0];
	for (var i = 0; i < a.length; i++) {
		if(a[i] < min) {
			min = a[i];
		}
	}
	return min;
}

//biggest el in array
function max(a) {
	var max = a[0];
	for (var i = 0; i < a.length; i++) {
		if(a[i] > max) {
			max = a[i];
		}
	}
	return max;
}

//init session
process.stdin.resume();
process.stdin.setEncoding("utf8")
process.stdin.on('data', function(chunk) {
	var str = chunk.toString();
	var splitted = str.trim().split(" ");
	if(dataSets < 0) {
		dataSets = parseInt(str);
		currentSet = 0;
		conversionData = [];
		setData = [];
		meta = [];
		dataLinesRead = 0;
	}
	else if(!readMeta) {
		meta[currentSet] = str.split(" ");
		setData[currentSet] = [];
		readMeta = true;
	}
	else if(!readConversion) {
		if(splitted.length != meta[currentSet][0] - 1) {
			console.log("error! please specify exactly " + (meta[currentSet][0] - 1) + " denominations");
		}
		else {
			conversionData[currentSet] = calcCurrencyRate(splitted);
			readConversion = true;
		}
	}
	else {
		if(splitted.length != meta[currentSet][0]) {
			console.log("error! please specify exactly " + (meta[currentSet][1]) + " prices");
		}
		else {
			setData[currentSet][dataLinesRead] = splitted;
			if(++dataLinesRead == meta[currentSet][1]) {
				currentSet++;

				calculateResult();

				//restart session
				readMeta = false;
				readConversion = false;
				dataLinesRead = 0;
			}
		}
	}

});

// calculate the results
function calculateResult() {
	if(currentSet >= dataSets) {
		var prices = [];
		for(var i = 0; i < setData.length; i++) { // each dataset
			prices[i] = [];
			for(var x = 0; x < setData[i].length; x++) { // each line
				prices[i][x] = 0;
				line = setData[i][x];
				for(var n = 0; n < line.length; n++) { // each column
					prices[i][x] += parseInt(line[n]) * parseInt(conversionData[i][n]);
				}
			}

			console.log("Data Set " + (i + 1));
			console.log(max(prices[i]) - min(prices[i]));
		}
		dataSets = -1;
	}
}

// input: 2 3
// output: 6 (2*3) 3 (3) 1 (3/3)

// input 2
// output 2 1
function calcCurrencyRate(a) {
	var out = [];
	for(var i = 0; i <= a.length; i++) {
		out[i] = 1;
		for (var n = i; n < a.length; n++) {
			out[i] *= a[n];
		}
	}
	return out;
}