solution: 0202. Happy Number

Author: flynnpark

solutions/solution_0202/__init__.py

@@ -1,2 +1,18 @@
 class Solution:
-    def isHappy(self, n: int) -> bool: ...
+    def isHappy(self, n: int) -> bool:
+        current_number = n
+        checked_numbers = {}
+
+        while True:
+            number_sum = 0
+            for i in str(current_number):
+                number_sum += int(i) ** 2
+
+            if number_sum == 1:
+                return True
+
+            if number_sum in checked_numbers:
+                return False
+
+            checked_numbers[number_sum] = True
+            current_number = number_sum