【算法圖解】：數據結構教程李春葆版P378

1. ?遞歸代碼：

#include<iostream> #include<vector> using namespace std;void quicksort(vector<int> &v, int left, int right) {if (left < right){int key = v[left];int low = left;int high = right;while (low < high){while(low < high && v[high] >= key)high--;v[low] = v[high];while (low < high && v[low] < key)low++;v[high] = v[low];}v[low] = key;quicksort(v, left, low - 1);quicksort(v, low + 1, right);} }int main() {vector<int> num = { 6, 8, 7, 9, 0, 1, 3, 2, 4, 5 };quicksort(num, 0, num.size() - 1);for (auto c : num)cout << c << " ";cout << endl;return 0; }

2. 非遞歸版本：

#include<iostream> #include<vector> #include<stack> using namespace std;void quicksort(vector<int> & arr, int length) {stack<int> lowHigh;//先存大再存小，取得時候就可以先取小再取大，此處的大小指的是數組索引lowHigh.push(length - 1);lowHigh.push(0);int low, high;while (!lowHigh.empty()){low = lowHigh.top(); lowHigh.pop();high = lowHigh.top(); lowHigh.pop();if (low >= high)continue;int i = low; int j = high;int value = arr[low];while (i < j)//i==j循環結束{while (arr[j] > value)j--;//右邊的都大于valuestd::swap(arr[j], arr[i]);while (arr[i] < value)i++;//左邊的都小于valuestd::swap(arr[i], arr[j]);}//開始存儲左右兩側待處理的數據，為了先處理左側先保存右側數據lowHigh.push(high);lowHigh.push(i + 1);//左側lowHigh.push(i - 1);lowHigh.push(low);} }int main() {vector<int> data = { 6, 8, 7, 9, 0, 1, 3, 2, 4, 5 };quicksort(data, data.size());for (int i = 0; i < 10; ++i)printf("%d ", data[i]);return 0; }

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