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by Sumit Chourasia | Oct 17, 2020 | Category :coding | Tags : algorithm data-structure easy leetcode maths

Construct the Rectangle - Maths - Easy - LeetCode

Construct the Rectangle - Maths - Easy - LeetCode

A web developer needs 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:

The area of the rectangular web page you designed must equal to the given target area.
The width W should not be larger than the length L, which means L >= W.
The difference between length L and width W should be as small as possible.
Return an array [L, W] where L and W are the length and width of the web page you designed in sequence.

 

Example 1:

Input: area = 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.
Example 2:

Input: area = 37
Output: [37,1]
Example 3:

Input: area = 122122
Output: [427,286]
 

Constraints:

1 <= area <= 107

public class Solution {
    public int[] ConstructRectangle(int area) {
        int min = int.MaxValue;
        var res = new int[2];
        var sqrt = Math.Sqrt(area);
        for(int W = 1;W<=sqrt;W++){
            
            if(area%W!=0){
                continue;
            }
            
            int L = area/W;
            if(min>(L-W)){
                min = L-W;
                res[0]=L;
                res[1]=W;
            }
        }
        
        return res;
    }
}

Time Complexity: O(n*m)

Space Complexity: O(1)

 

Here n is the input number and m is the time take to compute square root of each number.

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