Commit 1dc1959

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feat: add swift implementation to lcof2 problem: No.036 (doocs#3041)

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Original file line number	Diff line number	Diff line change
`@@ -217,6 +217,37 @@ func popInt(stack *arraystack.Stack) int {`
`217`	`217`	`}`
`218`	`218`	```
`219`	`219`
	`220`	`+#### Swift`
	`221`	`+`
	`222`	+```swift
	`223`	`+class Solution {`
	`224`	`+ func evalRPN(_ tokens: [String]) -> Int {`
	`225`	`+ var stk = [Int]()`
	`226`	`+`
	`227`	`+ for token in tokens {`
	`228`	`+ if let num = Int(token) {`
	`229`	`+ stk.append(num)`
	`230`	`+ } else {`
	`231`	`+ let y = stk.removeLast()`
	`232`	`+ let x = stk.removeLast()`
	`233`	`+ switch token {`
	`234`	`+ case "+":`
	`235`	`+ stk.append(x + y)`
	`236`	`+ case "-":`
	`237`	`+ stk.append(x - y)`
	`238`	`+ case "*":`
	`239`	`+ stk.append(x * y)`
	`240`	`+ default:`
	`241`	`+ stk.append(x / y)`
	`242`	`+ }`
	`243`	`+ }`
	`244`	`+ }`
	`245`	`+`
	`246`	`+ return stk.removeLast()`
	`247`	`+ }`
	`248`	`+}`
	`249`	+```
	`250`	`+`
`220`	`251`	`<!-- tabs:end -->`
`221`	`252`
`222`	`253`	`<!-- solution:end -->`

Lines changed: 26 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,26 @@`
	`1`	`+class Solution {`
	`2`	`+ func evalRPN(_ tokens: [String]) -> Int {`
	`3`	`+ var stk = [Int]()`
	`4`	`+`
	`5`	`+ for token in tokens {`
	`6`	`+ if let num = Int(token) {`
	`7`	`+ stk.append(num)`
	`8`	`+ } else {`
	`9`	`+ let y = stk.removeLast()`
	`10`	`+ let x = stk.removeLast()`
	`11`	`+ switch token {`
	`12`	`+ case "+":`
	`13`	`+ stk.append(x + y)`
	`14`	`+ case "-":`
	`15`	`+ stk.append(x - y)`
	`16`	`+ case "*":`
	`17`	`+ stk.append(x * y)`
	`18`	`+ default:`
	`19`	`+ stk.append(x / y)`
	`20`	`+ }`
	`21`	`+ }`
	`22`	`+ }`
	`23`	`+`
	`24`	`+ return stk.removeLast()`
	`25`	`+ }`
	`26`	`+}`

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