Merge pull request neetcode-gh#1903 from saip7795/sp/happy-number

Create: 0202-happy-number.rb

Author: tahsintunan

Diff for: ruby/0202-happy-number.rb

@@ -0,0 +1,22 @@
+def is_happy(n)
+    visit = Set.new([])
+
+    while !visit.include?(n)
+        visit.add(n)
+        n = sum_of_squares(n)
+        return true if n==1
+    end
+
+    return false
+
+end
+
+def sum_of_squares(n)
+ output = 0
+ while n != 0
+    digit = n%10
+    output += (digit*digit)
+    n = n/10
+ end
+ return output
+end