resolve two problem with swift

Author: EternalChildren

.gitignore

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+# OSX
+.DS_Store

numJewelsInStones/numJewelsInStones.playground/Contents.swift

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+// You're given strings J representing the types of stones that are jewels, and S representing the stones you have.
+// Each character in S is a type of stone you have.
+// You want to know how many of the stones you have are also jewels.
+// The letters in J are guaranteed distinct, and all characters in J and S are letters. Letters are case sensitive,
+// so "a" is considered a different type of stone from "A".
+
+
+var J = "aA"
+var S = "aAAbbbb"
+
+// 12ms
+func numJewelsInStones(_ J: String, _ S: String) -> Int {
+    var dic = [Character: Int]()
+    var res = 0
+    for (_, v) in S.enumerated() {
+        if let count = dic[v] {
+            dic[v] = count + 1
+        } else {
+            dic[v] = 1
+        }
+    }
+    for (_, j) in J.enumerated() {
+        if let count = dic[j] {
+            res += count
+        }
+    }
+    return res
+}
+
+
+numJewelsInStones(J, S)

numJewelsInStones/numJewelsInStones.playground/contents.xcplayground

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='macos' executeOnSourceChanges='false'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>

removeDuplicates/removeDuplicates.playground/Contents.swift

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+
+var num = [Int]()
+
+// 80ms
+func removeDuplicates1(_ nums: inout [Int]) -> Int {
+    guard nums.count > 0 else {
+        return 0
+    }
+    var i = 0
+    for j in 1..<nums.count {
+        if nums[i] != nums[j] {
+            i += 1
+            nums[i] = nums[j]
+        }
+    }
+    return i + 1
+}
+
+// 100ms
+func removeDuplicates2(_ nums: inout [Int]) -> Int {
+    var dic = [Int: Int]()
+    for i in 0..<nums.count {
+        dic[nums[i]] = i
+    }
+    nums = Array(dic.keys)
+    nums.sort()
+    return dic.keys.count
+}
+
+
+removeDuplicates1(&num)
+removeDuplicates2(&num)
+

removeDuplicates/removeDuplicates.playground/contents.xcplayground

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='macos' executeOnSourceChanges='false'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>

removeDuplicates/removeDuplicates.playground/playground.xcworkspace/contents.xcworkspacedata

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>