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`@@ -2121,6 +2121,13 @@ class Solution:`
`2121`	`2121`	`- 按照从右上角到左下角的顺序遍历 matrix 的所有对角线并放入列表 temp`
`2122`	`2122`	`- 如果对角线元素个数是偶数则应该把 temp 反转`
`2123`	`2123`	`- 把 temp 加入结果 r`
	`2124`	`+## [507. Perfect Number](https://leetcode.com/problems/perfect-number/)`
	`2125`	+```python
	`2126`	`+class Solution:`
	`2127`	`+ def checkPerfectNumber(self, num: int) -> bool:`
	`2128`	`+ return num in (6, 28, 496, 8128, 33550336, 8589869056, 137438691328, 2305843008139952128)`
	`2129`	+```
	`2130`	`+- 题目中给出了解的范围,且解的个数是固定的,因此可以提前计算出所有解`
`2124`	`2131`	`## [557. Reverse Words in a String III 1行](https://leetcode.com/problems/reverse-words-in-a-string-iii/)`
`2125`	`2132`	```python
`2126`	`2133`	`class Solution:`

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