[LeetCode By Go 29]492. Construct the Rectangle

這是一個建立於 的文章，其中的資訊可能已經有所發展或是發生改變。

馬上寫了30道題目了，使用golang寫起題目來代碼簡潔明了，還可以非常方便的寫測試案例，加上Goland可以進行調試，有如神助。
但無論如何，寫了測試就會依賴測試判斷對錯，用了debug就會依賴debug來尋找出錯的地方，這些其實都是自己大腦偷懶把壓力推到了測試和工具上，在日常開發上可以這樣提高代碼品質和工作效率，但是在筆試面試時基本上不會用編譯器調試代碼，更別說寫測試案例了。
因此，之後如果能直接把題目解出來，就不寫測試案例了，我也省（寫）時（煩）間（啦）嘛。

題目

For a web developer, it is very important to know how to design a web page's size. So, given a specific rectangular web page’s area, your job by now is to design a rectangular web page, whose length L and width W satisfy the following requirements:

1. The area of the rectangular web page you designed must equal to the given target area.
2. The width W should not be larger than the length L, which means L >= W.
3. The difference between length L and width W should be as small as possible.

You need to output the length L and the width W of the web page you designed in sequence.

Example:

Input: 4
Output: [2, 2]
Explanation: The target area is 4, and all the possible ways to construct it are [1,4], [2,2], [4,1].
But according to requirement 2, [1,4] is illegal; according to requirement 3, [4,1] is not optimal compared to [2,2]. So the length L is 2, and the width W is 2.

Note:

1. The given area won't exceed 10,000,000 and is a positive integer
2. The web page's width and length you designed must be positive integers.

解題思路

求面積的平方根，然後將根作為寬度w，如果area能整除w，則l=area/w, 否則w減1，再進行相同的判斷
注意
有人覺得根可以作為寬度遞減判斷，也可以作為長度遞增判斷。但是考慮到求平方根後有可能得到小數，如果將根轉換為int後，l < (area/l), 與實際不符，因此平方根應該作為寬度

代碼

constructRectangle.go

package _492_Construct_the_Rectangleimport "math"func constructRectangle(area int) []int {    var ret []int    sqrtArea := math.Sqrt(float64(area))    var w int    w = int(sqrtArea)    for ; w > 0; w-- {        if area % w == 0 {            l := area / w            ret = []int{l, w}            break        }    }    return ret}