feat: add swift implementation to lcp problem: No.50 (#3785)

Author: klever34

lcp/LCP 50. 宝石补给/README.md

@@ -154,6 +154,27 @@ function giveGem(gem: number[], operations: number[][]): number {
 }
 ```
 
+#### Swift
+
+```swift
+class Solution {
+    func giveGem(_ gem: [Int], _ operations: [[Int]]) -> Int {
+        var gem = gem
+        
+        for op in operations {
+            let x = op[0], y = op[1]
+            let v = gem[x] / 2
+            gem[y] += v
+            gem[x] -= v
+        }
+        
+        let maxGem = gem.max() ?? 0
+        let minGem = gem.min() ?? 0
+        return maxGem - minGem
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

lcp/LCP 50. 宝石补给/Solution.swift

@@ -0,0 +1,16 @@
+class Solution {
+    func giveGem(_ gem: [Int], _ operations: [[Int]]) -> Int {
+        var gem = gem
+        
+        for op in operations {
+            let x = op[0], y = op[1]
+            let v = gem[x] / 2
+            gem[y] += v
+            gem[x] -= v
+        }
+        
+        let maxGem = gem.max() ?? 0
+        let minGem = gem.min() ?? 0
+        return maxGem - minGem
+    }
+}