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feat: add swift implementation to lcp problem: No.61 (doocs#3932)

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`@@ -183,6 +183,31 @@ impl Solution {`
`183`	`183`	`}`
`184`	`184`	```
`185`	`185`
	`186`	`+#### Swift`
	`187`	`+`
	`188`	+```swift
	`189`	`+class Solution {`
	`190`	`+ func temperatureTrend(_ temperatureA: [Int], _ temperatureB: [Int]) -> Int {`
	`191`	`+ var maxTrend = 0`
	`192`	`+ var currentTrend = 0`
	`193`	`+`
	`194`	`+ for i in 0..<temperatureA.count - 1 {`
	`195`	`+ let changeA = temperatureA[i + 1] - temperatureA[i]`
	`196`	`+ let changeB = temperatureB[i + 1] - temperatureB[i]`
	`197`	`+`
	`198`	`+ if (changeA == 0 && changeB == 0) \|\| (changeA * changeB > 0) {`
	`199`	`+ currentTrend += 1`
	`200`	`+ maxTrend = max(maxTrend, currentTrend)`
	`201`	`+ } else {`
	`202`	`+ currentTrend = 0`
	`203`	`+ }`
	`204`	`+ }`
	`205`	`+`
	`206`	`+ return maxTrend`
	`207`	`+ }`
	`208`	`+}`
	`209`	+```
	`210`	`+`
`186`	`211`	`<!-- tabs:end -->`
`187`	`212`
`188`	`213`	`<!-- solution:end -->`

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`@@ -0,0 +1,20 @@`
	`1`	`+class Solution {`
	`2`	`+ func temperatureTrend(_ temperatureA: [Int], _ temperatureB: [Int]) -> Int {`
	`3`	`+ var maxTrend = 0`
	`4`	`+ var currentTrend = 0`
	`5`	`+`
	`6`	`+ for i in 0..<temperatureA.count - 1 {`
	`7`	`+ let changeA = temperatureA[i + 1] - temperatureA[i]`
	`8`	`+ let changeB = temperatureB[i + 1] - temperatureB[i]`
	`9`	`+`
	`10`	`+ if (changeA == 0 && changeB == 0) \|\| (changeA * changeB > 0) {`
	`11`	`+ currentTrend += 1`
	`12`	`+ maxTrend = max(maxTrend, currentTrend)`
	`13`	`+ } else {`
	`14`	`+ currentTrend = 0`
	`15`	`+ }`
	`16`	`+ }`
	`17`	`+`
	`18`	`+ return maxTrend`
	`19`	`+ }`
	`20`	`+}`

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