Create MinPerimeterRectangle.md

Author: yaseenshaik

MinPerimeterRectangle.md

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+
+### Task description
+
+An integer N is given, representing the area of some rectangle.
+
+The area of a rectangle whose sides are of length A and B is A * B, and the perimeter is 2 * (A + B).
+
+The goal is to find the minimal perimeter of any rectangle whose area equals N. The sides of this rectangle should be only integers.
+
+For example, given integer N = 30, rectangles of area 30 are:
+
+* (1, 30), with a perimeter of 62,
+* (2, 15), with a perimeter of 34,
+* (3, 10), with a perimeter of 26,
+* (5, 6), with a perimeter of 22.
+
+Write a function:
+
+`function solution(N);`
+
+that, given an integer N, returns the minimal perimeter of any rectangle whose area is exactly equal to N.
+
+For example, given an integer N = 30, the function should return 22, as explained above.
+
+Assume that:
+
+* N is an integer within the range [1..1,000,000,000].
+
+Complexity:
+
+* expected worst-case time complexity is O(sqrt(N));
+* expected worst-case space complexity is O(1).
+
+```javascript
+function solution(N) {
+    // write your code in JavaScript (Node.js 6.4.0)
+    for (var i = parseInt(Math.sqrt(N), 10); true ; i--)
+            if (N % i == 0)
+                return 2 * i + 2 * (N / i);
+}
+```