feat: WEEK 04 solution (coin-change)

Author: tigermint

coin-change/tigermint.kt

@@ -0,0 +1,16 @@
+class Solution {
+    fun coinChange(coins: IntArray, amount: Int): Int {
+        val dp = IntArray(amount + 1) { amount + 1 }
+        dp[0] = 0
+
+        for (i in 1..amount) {
+            for (c in coins) {
+                if (i - c >= 0) {
+                    dp[i] = minOf(dp[i], dp[i - c] + 1)
+                }
+            }
+        }
+
+        return if (dp[amount] > amount) - 1 else dp[amount]
+    }
+}