coin change solution

Author: yhkee0404

coin-change/yhkee0404.dart

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+class Solution {
+  int coinChange(List<int> coins, int amount) {
+    List<int> dp = List.filled(amount + 1, amount + 1);
+    // S(n) = O(amount)
+    dp[0] = 0;
+    for (int i = 1; i <= amount; i++) {
+        // T(n) = O(amount * coins.length)
+        dp[i] = 1 + coins.where((x) => x <= i)
+                .map((x) => dp[i - x])
+                .fold(amount, (a, b) => min(a, b));
+    }
+    return dp[amount] <= amount ? dp[amount] : -1;
+  }
+}