Commit 1d47b74

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Merge pull request youngyangyang04#1989 from fwqaaq/master

Update 24. 两两交换链表中的节点 about rust 优化

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Original file line number	Diff line number	Diff line change
`@@ -409,7 +409,7 @@ impl Solution {`
`409`	`409`	`// 递归`
`410`	`410`	`impl Solution {`
`411`	`411`	`pub fn swap_pairs(head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {`
`412`		`- if head==None\|\| head.as_ref().unwrap().next==None {`
	`412`	`+ if head.is_none() \|\| head.as_ref().unwrap().next.is_none() {`
`413`	`413`	`return head;`
`414`	`414`	`}`
`415`	`415`

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