feat: 322. Coin Change

Author: gwbaik9717

coin-change/gwbaik9717.js

@@ -0,0 +1,33 @@
+// n: amount m: length of coins
+// Time complexity: O(n * m) + O(mlogm)
+// Space complexity: O(n * m)
+
+/**
+ * @param {number[]} coins
+ * @param {number} amount
+ * @return {number}
+ */
+var coinChange = function (coins, amount) {
+  const dp = Array.from({ length: coins.length + 1 }, () =>
+    Array.from({ length: amount + 1 }, () => Infinity)
+  );
+  coins.sort((a, b) => a - b);
+
+  for (let i = 0; i < coins.length + 1; i++) {
+    dp[i][0] = 0;
+  }
+
+  for (let i = 1; i <= amount; i++) {
+    for (let j = 1; j <= coins.length; j++) {
+      const coin = coins[j - 1];
+
+      if (i >= coin) {
+        dp[j][i] = Math.min(dp[j][i], 1 + dp[j][i - coin]);
+      }
+
+      dp[j][i] = Math.min(dp[j][i], dp[j - 1][i]);
+    }
+  }
+
+  return dp.at(-1).at(-1) === Infinity ? -1 : dp.at(-1).at(-1);
+};