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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                歸并也使用了分治的思想,并且可以使用 `遞歸` 實現。 圖示: ![](https://img.kancloud.cn/6f/92/6f92326f3277c3d2e3e5d23bfbb29d3d_1638x1194.png) ~~~ // 拆分原數組,一半一半的拆分成左右兩個數組 function mergeSort(arr) { // 當分的只剩一個時直接返回 if(arr.length<2) { return arr } // 取中間位置 let midPos = parseInt(arr.length/2) // 拆分成兩個子數組 let left = arr.slice(0, midPos) let right = arr.slice(midPos) // 合并兩個分支 return merge(mergeSort(left), mergeSort(right)) } // 合并兩個數組(按升序合并) function merge(left, right) { // 定義一個額外的數組,用來實現合并,這個數組的長度就是原數組的長度 n,所有空間復雜度是 O(n) let result = [] while(left.length && right.length) { // 如果左邊小就彈出左邊的第1個元素放到 result 中,否則彈出右邊的第1個元素放到 result 中 if(left[0]<right[0]) { result.push(left.shift()) } else { result.push(right.shift()) } } // 如果左邊還剩有元素 while(left.length) { result.push(left.shift()) } while(right.length) { result.push(right.shift()) } return result } ~~~
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