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feat: add swift implementation to lcof2 problem: No.038 (doocs#3048)

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`@@ -180,6 +180,28 @@ impl Solution {`
`180`	`180`	`}`
`181`	`181`	```
`182`	`182`
	`183`	`+#### Swift`
	`184`	`+`
	`185`	+```swift
	`186`	`+class Solution {`
	`187`	`+ func dailyTemperatures(_ temperatures: [Int]) -> [Int] {`
	`188`	`+ let n = temperatures.count`
	`189`	`+ var ans = [Int](repeating: 0, count: n)`
	`190`	`+ var stack = [Int]()`
	`191`	`+`
	`192`	`+ for i in 0..<n {`
	`193`	`+ while !stack.isEmpty && temperatures[stack.last!] < temperatures[i] {`
	`194`	`+ let j = stack.removeLast()`
	`195`	`+ ans[j] = i - j`
	`196`	`+ }`
	`197`	`+ stack.append(i)`
	`198`	`+ }`
	`199`	`+`
	`200`	`+ return ans`
	`201`	`+ }`
	`202`	`+}`
	`203`	+```
	`204`	`+`
`183`	`205`	`<!-- tabs:end -->`
`184`	`206`
`185`	`207`	`<!-- solution:end -->`

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`@@ -0,0 +1,17 @@`
	`1`	`+class Solution {`
	`2`	`+ func dailyTemperatures(_ temperatures: [Int]) -> [Int] {`
	`3`	`+ let n = temperatures.count`
	`4`	`+ var ans = [Int](repeating: 0, count: n)`
	`5`	`+ var stack = [Int]()`
	`6`	`+`
	`7`	`+ for i in 0..<n {`
	`8`	`+ while !stack.isEmpty && temperatures[stack.last!] < temperatures[i] {`
	`9`	`+ let j = stack.removeLast()`
	`10`	`+ ans[j] = i - j`
	`11`	`+ }`
	`12`	`+ stack.append(i)`
	`13`	`+ }`
	`14`	`+`
	`15`	`+ return ans`
	`16`	`+ }`
	`17`	`+}`

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