Lua论分析需求（学好英文）的重要性

题目是这样的：

 

Observe that its base and height are both equal to

, and the image is drawn using # symbols and spaces. The last line is not preceded by any spaces.

Write a program that prints a staircase of size .

Function Description

Complete the staircase function in the editor below. It should print a staircase as described above.

例子是这样的：

 

 What fuck!这是右对齐么？？？耗尽我的脑细胞，分析每行#号前后需要空格与行数的对应关系。结果只要右对齐就可以了。

function InitStr(n )
    str = {}-- body
    for i=1,n do
        str[i] = {}
        for j=1,n do
            str[i][j] = "#"            
        end
    end
    return str
end

function staircase1(n)
        -- body

    arr = InitStr(n)
    for i=1,n do
        integer,frac = math.modf((n-i)/2)
        if(frac > 0)then
            leftSpaceCount = integer + 1
        else
            leftSpaceCount = integer
        end
        for j=1,i do
            arr[i][leftSpaceCount+j] = "#"
        end
        print(table.concat(arr[i]))
    end
end

function staircase(n)
        -- body

    arr = InitStr(n)
    for i=1,n do
        leftSpaceCount = n - i
        for j=1,leftSpaceCount do
            arr[i][j] = " "
        end
        print(table.concat(arr[i]))
    end
end
staircase(6)