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feat: add swift implementation to lcof2 problem: No.042 (doocs#3052)

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Original file line number	Diff line number	Diff line change
`@@ -213,6 +213,32 @@ RecentCounter.prototype.ping = function (t) {`
`213`	`213`	`*/`
`214`	`214`	```
`215`	`215`
	`216`	`+#### Swift`
	`217`	`+`
	`218`	+```swift
	`219`	`+class RecentCounter {`
	`220`	`+ private var q: [Int]`
	`221`	`+`
	`222`	`+ init() {`
	`223`	`+ q = []`
	`224`	`+ }`
	`225`	`+`
	`226`	`+ func ping(_ t: Int) -> Int {`
	`227`	`+ q.append(t)`
	`228`	`+ while q.first! < t - 3000 {`
	`229`	`+ q.removeFirst()`
	`230`	`+ }`
	`231`	`+ return q.count`
	`232`	`+ }`
	`233`	`+}`
	`234`	`+`
	`235`	`+/**`
	`236`	`+ * Your RecentCounter object will be instantiated and called as such:`
	`237`	`+ * let obj = RecentCounter()`
	`238`	`+ * let param_1 = obj.ping(t)`
	`239`	`+ */`
	`240`	+```
	`241`	`+`
`216`	`242`	`<!-- tabs:end -->`
`217`	`243`
`218`	`244`	`<!-- solution:end -->`

Lines changed: 21 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,21 @@`
	`1`	`+class RecentCounter {`
	`2`	`+ private var q: [Int]`
	`3`	`+`
	`4`	`+ init() {`
	`5`	`+ q = []`
	`6`	`+ }`
	`7`	`+`
	`8`	`+ func ping(_ t: Int) -> Int {`
	`9`	`+ q.append(t)`
	`10`	`+ while q.first! < t - 3000 {`
	`11`	`+ q.removeFirst()`
	`12`	`+ }`
	`13`	`+ return q.count`
	`14`	`+ }`
	`15`	`+}`
	`16`	`+`
	`17`	`+/**`
	`18`	`+ * Your RecentCounter object will be instantiated and called as such:`
	`19`	`+ * let obj = RecentCounter()`
	`20`	`+ * let param_1 = obj.ping(t)`
	`21`	`+ */`

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