LeetCode Construct the Rectangle 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.

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给定一个面积area，要求出一个长L和宽W，使得L*W=area，并且L>=W，并且L和W的差越小越好。 简单题，先对area开根号，然后L不断++，直到L*W=area为止。 唯一需要注意的是，必须L=ceil(sqrt(area))，因为如果area=2，不加ceil的话，L=1,W=2了。 完整代码如下： [cpp] class Solution { public: vector<int> constructRectangle(int area) { int L = ceil(sqrt(area)); while (area%L != 0) { ++L; } return vector<int>({ L,area / L }); } }; [/cpp] 本代码提交AC，用时89MS。不开心，为啥这么慢呢。。。]]>