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

Create: 0202-happy-number.rb

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