Create YoureASquare.java

Author: cbarkinozer

StreamSolutions/YoureASquare.java

@@ -0,0 +1,48 @@
+/*
+A square of squares
+You like building blocks. You especially like building blocks that are squares. And what you even like more, is to arrange them into a square of square building blocks!
+However, sometimes, you can't arrange them into a square. Instead, you end up with an ordinary rectangle! Those blasted things! If you just had a way to know, whether you're currently working in vain… Wait! That's it! You just have to check if your number of building blocks is a perfect square.
+Task
+Given an integral number, determine if it's a square number:
+In mathematics, a square number or perfect square is an integer that is the square of an integer; in other words, it is the product of some integer with itself.
+The tests will always use some integral number, so don't worry about that in dynamic typed languages.
+Examples
+-1  =>  false
+ 0  =>  true
+ 3  =>  false
+ 4  =>  true
+25  =>  true
+26  =>  false
+*/
+
+
+//This takes long time with large data
+import java.util.stream.IntStream;
+
+public class Square {    
+    public static boolean isSquare(int n) {
+      
+      if (n==0){
+        return true;
+      }
+      
+        return IntStream.rangeClosed(1, n)
+                .filter(x -> x * x == n)
+                .findFirst()
+                .isPresent();
+    }
+}
+
+//Use this instead:
+
+public class Square {    
+    public static boolean isSquare(int n) {
+      
+        if (n < 0) {
+            return false;
+        }
+        
+        int sqrt = (int) Math.sqrt(n);
+        return sqrt * sqrt == n;
+      }
+}