速贴墙纸

描述：

约翰想用墙纸装饰他的房间，但他不确定需要买几卷，已知约翰的房间长“l”米，宽“w”米，高“h”米。墙纸长“10”米，宽“52”厘米。为了以防万一，他想买比他所需要的墙纸长度多百分之十五，你能帮帮他吗？

例如：

wallpaper(4, 3.5, 3) 应该返回 “ten”

CodeWar:

using System;
using System.Collections.Generic;

public class Wallpaper
{
    public static string WallPaper(double l, double w, double h)
    {
        var numberName = new Dictionary<int, string>()
        {
            { 1, "one" },
            { 2, "two" },
            { 3, "three" },
            { 4, "four" },
            { 5, "five" },
            { 6, "six" },
            { 7, "seven" },
            { 8, "eight" },
            { 9, "nine" },
            { 10, "ten" },
            { 11, "eleven" },
            { 12, "twelve" },
            { 13, "thirteen" },
            { 14, "fourteen" },
            { 15, "fifteen" },
            { 16, "sixteen" },
            { 17, "seventeen" },
            { 18, "eighteen" },
            { 19, "nineteen" },
            { 20, "twenty" }
        };
        return l > 0 && w > 0 && h > 0 ? numberName[(int)Math.Ceiling(2 * h * (l + w) / 5.2 * 1.15)] : "zero";
    }
}