Add naive approach

maths/fizz_buzz.rb

@@ -0,0 +1,56 @@
+# Write a program that outputs the string representation of numbers
+# from 1 to n. But for multiples of three it should output “Fizz”
+# instead of the number and for the multiples of five output “Buzz”.
+# For numbers which are multiples of both three and five output
+# “FizzBuzz”.
+
+#
+# Approach 1: Naive Approach
+#
+
+# Complexity Analysis
+
+# Time Complexity: O(N)
+# Space Complexity: O(1)
+
+# @param {Integer} n
+# @return {String[]}
+def fizz_buzz(n)
+  str = []
+
+  n.times do |i|
+    i += 1
+
+    if i % 5 == 0 && i % 3 == 0
+      str.push('FizzBuzz')
+    elsif i % 3 == 0
+      str.push('Fizz')
+    elsif i % 5 == 0
+      str.push('Buzz')
+    else
+      str.push(i.to_s)
+    end
+  end
+
+  str
+end
+
+n = 15
+fizz_buzz(n)
+# => [
+#     "1",
+#     "2",
+#     "Fizz",
+#     "4",
+#     "Buzz",
+#     "Fizz",
+#     "7",
+#     "8",
+#     "Fizz",
+#     "Buzz",
+#     "11",
+#     "Fizz",
+#     "13",
+#     "14",
+#     "FizzBuzz"
+# ]