分区函数 partition function ## partition function: 归位函数,把最左边的数字当成分界数字,比它小的放左边,比它大的放右边 def ptn(lis, left, right): tmp = lis[left] while left < right: while left < right and lis[right] >= tmp: ## 不动那些大的. 必须加上等于号! right = right - 1 ...
functionquicksort(array,left,right)if(left<right)// 对当前子序列进行分割操作,并得到新基准值位置pivotIndex=partition(array,left,right)// 对左侧子序列递归排序quicksort(array,left,pivotIndex-1)// 对右侧子序列递归排序quicksort(array,pivotIndex+1,right) 在上面的伪代码中,quicksort()是快速排序函数的...
function quicksort(arr, left, right): if left < right: pivotIndex = partition(arr, left, right) quicksort(arr, left, pivotIndex - 1) quicksort(arr, pivotIndex + 1, right) function partition(arr, left, right): pivot = arr[right] i = left - 1 for j from left to right - 1: ...
function quicksort(arr, low, high) { if (low < high) { let pi = partition(arr, low, high); quicksort(arr, low, pi - 1); quicksort(arr, pi + 1, high); } } function partition(arr, low, high) { let pivot = arr[high]; let i = low - 1; for (let j = low; j < hi...
functionpartition(array, left, right, pivotIndex) pivotValue := array[pivotIndex] swap array[pivotIndex] and array[right]// Move pivot to endstoreIndex := leftforifromlefttoright - 1// left ≤ i < rightifarray[i] < pivotValue
functionpartition(array, left, right, pivotIndex) pivotValue := array[pivotIndex] swap array[pivotIndex] and array[right]// Move pivot to endstoreIndex := leftforifromlefttoright - 1// left ≤ i < rightifarray[i] < pivotValue
●Recursive Case: Choose a pivot, partition the array, and recursively sort the sub-arrays. Partition Function Partition(A[1...n]): swap (A[1] <=> #items <= pivot) i <- 0 for j <- 1 to n - 1 if (A[j] <= A[n]) ...
function swap(items, firstIndex, secondIndex){ var temp = items[firstIndex]; items[firstIndex] = items[secondIndex]; items[secondIndex] = temp; } 1. 2. 3. 4. 5. 实现的代码 function partition(items, left, right) { var pivot = items[Math.floor((right + left) / 2)], ...
快速排序(英语:Quicksort),又称划分交换排序(partition-exchange sort),简称快排,一种排序算法,最早由东尼·霍尔提出。在平均状况下,排序n个项目要O(nLogn)次比较。在最坏状况下则需要O(n^2)次比较,但这种状况并不常见。事实上,快速排序O(nLogn)通常明显比其他算法更快,因为它的内部循环(inner loop)可以在大...
class quick_sort{function quicksort(&$arr,$low,$top){if($low < $top){$pivotpos = $this->partition($arr,$low,$top);$this->quicksort($arr,$low,$pivotpos-1);$this->quicksort($arr,$pivotpos+1,$top);}}function partition(&$arr, $low ,$top){if($low == $top){return;}// ...