add: 只出现一次的数字等

src/array/best-time-to-buy-and-sell-stock-ii.js

@@ -0,0 +1,14 @@
+/**
+ * @param {number[]} prices
+ * @return {number}
+ */
+var maxProfit = function (prices) {
+  let profit = 0
+  for (let n = 1; n < prices.length; n++) {
+    if (prices[n] > prices[n - 1]) profit += prices[n] - prices[n - 1]
+  }
+
+  return profit
+}
+
+export default maxProfit