probleme_22.groovy

def process(line) {
	def returned = new TreeSet()
	line.split(",").each { elt ->
		returned.add(elt)
	}
	return returned
}

def compute(name, position, mapping) {
	def sum = new BigInteger(0);
	name.each { elt ->
		def character = elt as char
		if(mapping.containsKey(character))
			sum += mapping.get(character)
	}
	return sum*position
}

def mapping = new TreeMap();
for(i in 0..25) {
	mapping[i.plus('A' as char) as char] = new BigInteger(i+1);
}

def wholeSum = new BigInteger(0);

def wholeCollection = new TreeSet();
new File("names.txt").eachLine {
	wholeCollection.addAll(process(it))
}

wholeCollection.eachWithIndex {entry, index ->
// Damn, positions are 0-offset, while Euler expects a 1-offset !
	wholeSum += compute(entry, new BigInteger(index+1), mapping)
}

println wholeSum