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Project Euler 22

Project Euler

Problem22を解きました.

  • Names scores

Using names.txt (right click and 'Save Link/Target As...'), a 46K text file containing over five-thousand first names, begin by sorting it into alphabetical order. Then working out the alphabetical value for each name, multiply this value by its alphabetical position in the list to obtain a name score.

For example, when the list is sorted into alphabetical order, COLIN, which is worth 3 + 15 + 12 + 9 + 14 = 53, is the 938th name in the list. So, COLIN would obtain a score of 938 × 53 = 49714.

What is the total of all the name scores in the file?

https://projecteuler.net/problem=22

問題は「ファイルhttps://projecteuler.net/project/resources/p022_names.txt中の全名前のスコアの合計を求めよ」.

  • 例: COLIN
    • ソートした場合:リストの938番目にある
    • アルファベットの順番: 3 + 15 + 12 + 9 + 14 = 53
    • スコア: 938 × 53 = 49714
$hash = {"A" => "1", "B" => "2", "C" => "3", "D" => "4", "E" => "5", "F" => "6", "G" => "7", "H" => "8", "I" => "9", "J" => "10", "K" => "11", "L" => "12", "M" => "13", "N" => "14", "O" => "15", "P" => "16", "Q" => "17", "R" => "18", "S" => "19", "T" => "20", "U" => "21", "V" => "22", "W" => "23", "X" => "24", "Y" => "25", "Z" => "26"}

data = Array.new()
File.open("names.txt") do |file|
	file.each_line do |numStr|
		data = numStr.delete("\"").split(",")
	end
end

data.sort!

score = 0
for i in 0..data.length - 1 do
	temp = 0
	for j in 0..data.length - 1 do
		temp += $hash[data[i][j]].to_i
	end
	score += (i + 1) * temp
end

p score

ハッシュを使わなくても良かったかもしれません.