Merge branch 'master' of https://github.com/azl397985856/leetcode

Author: robot

README.md

@@ -334,7 +334,7 @@ leetcode 题解，记录自己的 leetcode 解题之路。
 - [0309. 最佳买卖股票时机含冷冻期](./problems/309.best-time-to-buy-and-sell-stock-with-cooldown.md)
 - [0322. 零钱兑换](./problems/322.coin-change.md) 👍
 - [0328. 奇偶链表](./problems/328.odd-even-linked-list.md)
-- [0331. 验证二叉树的前序序列化](./problems/328.odd-even-linked-list.md)
+- [0331. 验证二叉树的前序序列化](./problems/331.verify-preorder-serialization-of-a-binary-tree.md)
 - [0334. 递增的三元子序列](./problems/334.increasing-triplet-subsequence.md)
 - [0337. 打家劫舍 III](./problems/337.house-robber-iii.md)
 - [0343. 整数拆分](./problems/343.integer-break.md)

problems/416.partition-equal-subset-sum.md

@@ -294,6 +294,8 @@ var change = function (amount, coins) {
 };
 ```
 
+**注意这里内层循环和外层循环不能颠倒，即必须外层是遍历 coins，内层遍历 amount，否则 coins 就可能被使用多次而导致和题意不符**
+
 **复杂度分析**
 
 - 时间复杂度：$O(amount * len(coins))$