feat: Add solution for LeetCode problem 322

Author: WhiteHyun

coin-change/WhiteHyun.swift

@@ -0,0 +1,23 @@
+//  
+//  322. Coin Change
+//  https://leetcode.com/problems/coin-change/description/
+//  Dale-Study
+//  
+//  Created by WhiteHyun on 2024/07/14.
+//  
+
+class Solution {
+  func coinChange(_ coins: [Int], _ amount: Int) -> Int {
+    var dp: [Int] = .init(repeating: .max, count: amount + 1)
+
+    dp[0] = 0
+
+    for coin in coins {
+      for index in stride(from: coin, to: dp.count, by: 1) where dp[index - coin] != .max && dp[index - coin] + 1 < dp[index] {
+        dp[index] = dp[index - coin] + 1
+      }
+    }
+
+    return dp.last == .max ? -1 : dp.last!
+  }
+}