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feat: add swift implementation to lcof2 problem: No.034 (doocs#3039)

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Original file line number	Diff line number	Diff line change
`@@ -199,6 +199,40 @@ function isAlienSorted(words: string[], order: string): boolean {`
`199`	`199`	`}`
`200`	`200`	```
`201`	`201`
	`202`	`+#### Swift`
	`203`	`+`
	`204`	+```swift
	`205`	`+class Solution {`
	`206`	`+ func isAlienSorted(_ words: [String], _ order: String) -> Bool {`
	`207`	`+ var index = [Character: Int]()`
	`208`	`+`
	`209`	`+ for (i, char) in order.enumerated() {`
	`210`	`+ index[char] = i`
	`211`	`+ }`
	`212`	`+`
	`213`	`+ for i in 0..<words.count - 1 {`
	`214`	`+ let w1 = Array(words[i])`
	`215`	`+ let w2 = Array(words[i + 1])`
	`216`	`+ let l1 = w1.count`
	`217`	`+ let l2 = w2.count`
	`218`	`+`
	`219`	`+ for j in 0..<max(l1, l2) {`
	`220`	`+ let i1 = j >= l1 ? -1 : index[w1[j]]!`
	`221`	`+ let i2 = j >= l2 ? -1 : index[w2[j]]!`
	`222`	`+`
	`223`	`+ if i1 > i2 {`
	`224`	`+ return false`
	`225`	`+ }`
	`226`	`+ if i1 < i2 {`
	`227`	`+ break`
	`228`	`+ }`
	`229`	`+ }`
	`230`	`+ }`
	`231`	`+ return true`
	`232`	`+ }`
	`233`	`+}`
	`234`	+```
	`235`	`+`
`202`	`236`	`<!-- tabs:end -->`
`203`	`237`
`204`	`238`	`<!-- solution:end -->`

Lines changed: 29 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,29 @@`
	`1`	`+class Solution {`
	`2`	`+ func isAlienSorted(_ words: [String], _ order: String) -> Bool {`
	`3`	`+ var index = [Character: Int]()`
	`4`	`+`
	`5`	`+ for (i, char) in order.enumerated() {`
	`6`	`+ index[char] = i`
	`7`	`+ }`
	`8`	`+`
	`9`	`+ for i in 0..<words.count - 1 {`
	`10`	`+ let w1 = Array(words[i])`
	`11`	`+ let w2 = Array(words[i + 1])`
	`12`	`+ let l1 = w1.count`
	`13`	`+ let l2 = w2.count`
	`14`	`+`
	`15`	`+ for j in 0..<max(l1, l2) {`
	`16`	`+ let i1 = j >= l1 ? -1 : index[w1[j]]!`
	`17`	`+ let i2 = j >= l2 ? -1 : index[w2[j]]!`
	`18`	`+`
	`19`	`+ if i1 > i2 {`
	`20`	`+ return false`
	`21`	`+ }`
	`22`	`+ if i1 < i2 {`
	`23`	`+ break`
	`24`	`+ }`
	`25`	`+ }`
	`26`	`+ }`
	`27`	`+ return true`
	`28`	`+ }`
	`29`	`+}`

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