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Author: assassint2017

Happy Number/Happy_Number.py

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+# 第一种思路，简单粗暴，直接去模拟循环
+# 48ms 86.79%
+class Solution:
+    def isHappy(self, n):
+        """
+        :type n: int
+        :rtype: bool
+        """
+        res, numlist = 0, set()
+        while res != 1:
+            n = list(str(n))
+            res = sum([int(item) ** 2 for item in n])
+            if res in numlist:
+                return False
+            numlist.add(res)
+            n = res
+        return True