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1. 数组可以直接开到`int[] res = new int[n + 3];`然后就不需要用过`res[n-1]`的方式访问第`n`个元素了，直接`res[n]`即可。 2. 另外，开辟长度为n的数组存储中间结果不是最优的。空间复杂度可进一步优化。 3. md的代码格式，可以在代码段的开头和结尾加上```
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int[] res = new int[n + 3];此外，不需要通过res[n-1]的方式访问第n个元素，直接res[n]即可。n的数组存储中间结果不是最优的。空间复杂度可进一步优化为O(1)。