whace

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解决了 ![image](https://user-images.githubusercontent.com/20571798/123576421-f3ff5d80-d804-11eb-8b65-87a6f14a259c.png)

三行代码 内存击败100% `var merge = function(nums1, m, nums2, n) { for(let i = 0; i< n; i++){ nums1[i+m] = nums2[i] } nums1.sort((a,b)=>a -b) }; `