Create 322.零钱兑换.js

Author: yinxin630

322.零钱兑换.js

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+/**
+ * BFS 遍历
+ * @param {number[]} coins
+ * @param {number} amount
+ * @return {number}
+ */
+var coinChange = function(coins, amount) {
+    const set = new Set([amount]);
+    let queue = [[amount, 0]];
+    while (queue.length) {
+        const [a, b] = queue.shift();
+        if (a === 0) {
+            return b;
+        }
+        for (const c of coins) {
+            if (a - c >= 0 && !set.has(a - c)) {
+                set.add(a - c);
+                queue.push([a - c, b + 1]);
+            }
+        }
+    }
+    return -1;
+};
+
+/**
+ * 动态规划
+ * @param {number[]} coins
+ * @param {number} amount
+ * @return {number}
+ */
+/*
+var coinChange = function(coins, amount) {
+    const dp = new Array(amount + 1).fill(Number.MAX_SAFE_INTEGER);
+    dp[0] = 0;
+    for (let i = 1; i <= amount; i++) {
+        for (let j = 0; j < coins.length; j++) {
+            if (i - coins[j] >= 0) {
+                dp[i] = Math.min(dp[i], dp[i - coins[j]] + 1);
+            }
+        }
+    }
+    return dp[amount] === Number.MAX_SAFE_INTEGER ? -1 : dp[[amount]];
+};
+*/