排序算法 C++实现

Posted 2022-06-24 heifengli

一、插入排序 （Insertion Sort）

void insertion_sort(vector<int>& number)
    int length = number.size();
    if(length <= 1) return;
    
    for(int index = 1; index < length; ++index)
        int temp = number[index];
        int compare = index;
        for(; compare > 0 && temp < number[compare-1]; compare--)
            number[compare] = number[compare-1];
        number[compare] = temp;
    

 

二、 快速排序（Quick Sort）

void quick_sort(vector<int>& number, int begin, int end)

    if(begin >= end) return;
    int mid = (begin+end)/2, pivot = number[mid];
    swap(number[mid], number[end]);
    
    int temp = begin - 1;
    for(int i = begin; i < end; i++)
        if(number[i] <= pivot)
            swap(number[++temp], number[i]);
    swap(number[++temp], number[end]);
    
    quick_sort(number, begin, temp-1);
    quick_sort(number, temp+1, end);

 

 

 

示例代码：

#include <iostream>
#include <vector>

using namespace std;

void insertion_sort(vector<int>&);
void quick_sort(vector<int>&, int, int);

int main()

    vector<int> numbers = 34,8,64,51,21,1,23,45,90,47,35,70,134,152,251,540;
    // 1 8 21 23 34 35 45 47 51 64 70 90 134 152 251 540
    
    // insertion_sort(numbers);
    // quick_sort(numbers, 0, numbers.size()-1);

    for(int num : numbers)
        cout << num << ‘ ‘ ;
    return 0;