不得不说Ruby的核心api就自带解题的爽点，例如transpose和squeeze。
先是这道会员简单题，大家自己体会
422. 有效的单词方块

# @param {String[]} words
# @return {Boolean}
def valid_word_square(words)
   len = words.map {|it| it.length}.max
   words_t = words.map {|it| if it.length < len then it.each_char.to_a.concat(Array.new(len-it.length,"")) else it.each_char.to_a end }.transpose
   for i in 0...words.length
       if words[i] != words_t[i].join
            return false
        end
    end
    return true
end

然后是这道中等题
443. 压缩字符串

# @param {Character[]} chars
# @return {Integer}
def compress(chars1)
    c = chars1.join.squeeze
    i = 0
    j = 0
    ans = []
    ans << c[0]
    cnt = 0
    while i < c.length && j < chars1.length
        if c[i] == chars1[j]
            cnt += 1
            j += 1
        else
            if cnt > 1
                ans = ans.concat(cnt.to_s.each_char.to_a)
            end
            ans << chars1[j]
            cnt = 1
            i += 1
            j += 1
        end
        if j == chars1.length - 1 && c[i] == chars1[j]
            cnt += 1
            if cnt > 1
                ans = ans.concat(cnt.to_s.each_char.to_a)
            end
            chars1.clear
            chars1 = chars1.concat(ans)
            break
        end
        if j == chars1.length - 1 && c[i] != chars1[j]
            if cnt > 1
                ans = ans.concat(cnt.to_s.each_char.to_a)
            end
            ans << chars1[j]
            chars1.clear
            chars1 = chars1.concat(ans)
            break
        end
    end
end