选择排序

常规:

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#include "iostream"
using namespace std;
int main() {
    int length;
    cout << "请输入数组长度:";
    cin >> length;
    int *arr = new int[length];
    cout << "请输入数组元素:" << endl;
    for (int i = 0; i < length; i++) {
        cin >> arr[i];
    }
    //选择排序
    for (int i = 0; i < length - 1; i++) {
        int minIndex = i;
        for (int j = i + 1; j < length; j++) {
            minIndex=arr[i]>arr[j]?j:i;
        }
        if (minIndex!=i) {
            int temp = arr[i];
            arr[i] = arr[minIndex];
            arr[minIndex] = temp;
        }
    }
    for (int i = 0; i < length; ++i) {
        cout << arr[i] << " ";
    }
    delete []arr;
    return 0;
}

变种:

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#include "iostream"
using namespace std;
int main() {
    int length;
    cout << "请输入数组长度:";
    cin >> length;
    int *arr = new int[length];
    cout << "请输入数组元素:" << endl;
    for (int i = 0; i < length; i++) {
        cin >> arr[i];
    }
    //选择排序
    for (int i = 0; i < length; ++i) {
        for (int j = i+1; j < length; ++j) {
            if (arr[i]>arr[j])
            {
                int temp = arr[i];
                arr[i]=arr[j];
                arr[j]=temp;
            }
        }
    }
    for (int i = 0; i <length ; ++i) {
        cout<<arr[i]<<" ";
    }
    return 0;
}