Time: 36 ms (70.15%), Space: 13.8 MB (95.83%) - LeetHub

202-happy-number/202-happy-number.py

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+class Solution:
+    def isHappy(self, n: int) -> bool:
+        def sumSquareDigits(x: int) -> int:
+            sum = 0
+            while x > 0:
+                sum += (x % 10) ** 2
+                x = int(x / 10)
+            return sum
+        
+        used = set({n})
+        n = sumSquareDigits(n)
+        
+        while n != 1:
+            if n in used:
+                return False
+            used.add(n)
+            n = sumSquareDigits(n)
+        
+        return True