选择排序、冒泡排序和插入排序的代码示例

当循环下标从 1 开始且不使用 a[0] 时，以下是选择排序、冒泡排序和插入排序的代码示例：

#include <iostream>  
  
// 选择排序  
void selectionSort(int* a, int size) {  
    for (int i = 1; i < size - 1; i++) {  
        int minIndex = i;  
        for (int j = i + 1; j < size; j++) {  
            if (a[j] < a[minIndex]) {  
                minIndex = j;  
            }  
        }  
        if (a[minIndex] < a[i]) {  
            int temp = a[i];  
            a[i] = a[minIndex];  
            a[minIndex] = temp;  
        }  
    }  
}  
  
// 冒泡排序  
void bubbleSort(int* a, int size) {  
    for (int i = 1; i < size - 1; i++) {  
        for (int j = 1; j < size - i; j++) {  
            if (a[j] > a[j + 1]) {  
                int temp = a[j];  
                a[j] = a[j + 1];  
                a[j + 1] = temp;  
            }  
        }  
    }  
}  
  
// 插入排序  
void insertionSort(int* a, int size) {  
    for (int i = 2; i < size; i++) {  
        int key = a[i];  
        int j = i - 1;  
        while (j > 0 && a[j] > key) {  
            a[j + 1] = a[j];  
            j--;  
        }  
        a[j + 1] = key;  
    }  
}  
  
int main() {  
    int n;  
    std::cout << "Enter the number of elements: ";  
    std::cin >> n;  
  
    int* arr1 = new int[n+1]; // 选择排序用  
    int* arr2 = new int[n+1]; // 冒泡排序用  
    int* arr3 = new int[n+1]; // 插入排序用  
  
    std::cout << "Enter " << n << " elements: ";  
    for (int i = 1; i <= n; i++) {  
        std::cin >> arr1[i];  
        arr2[i] = arr1[i];  
        arr3[i] = arr1[i];  
    }  
  
    selectionSort(arr1, n+1);  
    bubbleSort(arr2, n+1);  
    insertionSort(arr3, n+1);  
  
    std::cout << "Selection Sorted array: ";  
    for (int i = 1; i <= n; i++) {  
        std::cout << arr1[i] << " ";  
    }  
    std::cout << std::endl;  
  
    std::cout << "Bubble Sorted array: ";  
    for (int i = 1; i <= n; i++) {  
        std::cout << arr2[i] << " ";  
    }  
    std::cout << std::endl;  
  
    std::cout << "Insertion Sorted array: ";  
    for (int i = 1; i <= n; i++) {  
        std::cout << arr3[i] << " ";  
    }  
    std::cout << std::endl;  
  
    delete[] arr1;  
    delete[] arr2;  
    delete[] arr3;  
  
    return 0;  
}