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`@@ -1844,6 +1844,14 @@ class Solution:`
`1844`	`1844`	```
`1845`	`1845`	`- odd 记录上一个奇数位节点,p 记录前一个节点`
`1846`	`1846`	`- 从第3个位置开始循环,每次都把当前节点接到 odd 后面,然后跳到下一个奇数位节点继续循环`
	`1847`	`+## [342. Power of Four 1行](https://leetcode.com/problems/power-of-four/)`
	`1848`	+```python
	`1849`	`+class Solution:`
	`1850`	`+ def isPowerOfFour(self, num: int) -> bool:`
	`1851`	`+ return num > 0 and not math.log(num, 4) % 1`
	`1852`	+```
	`1853`	+- 采用 log 运算,若结果为整数则 `num` 为 4 的幂
	`1854`	`+- 整数 % 1 为 0`
`1847`	`1855`	`## [344. Reverse String 1行](https://leetcode.com/problems/reverse-string/)`
`1848`	`1856`	```python
`1849`	`1857`	`class Solution:`

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