c++请使用归并排序算法实现10个整数 从大到小排序输出
时间: 2023-11-03 13:04:35 浏览: 106
C++实现各种排序算法类汇总
好的,下面是使用归并排序算法实现10个整数从大到小排序输出的C++代码:
```cpp
#include <iostream>
using namespace std;
void merge(int arr[], int l, int m, int r) {
int n1 = m - l + 1;
int n2 = r - m;
int L[n1], R[n2];
for (int i = 0; i < n1; i++)
L[i] = arr[l + i];
for (int j = 0; j < n2; j++)
R[j] = arr[m + 1 + j];
int i = 0, j = 0, k = l;
while (i < n1 && j < n2) {
if (L[i] >= R[j]) {
arr[k] = L[i];
i++;
}
else {
arr[k] = R[j];
j++;
}
k++;
}
while (i < n1) {
arr[k] = L[i];
i++;
k++;
}
while (j < n2) {
arr[k] = R[j];
j++;
k++;
}
}
void mergeSort(int arr[], int l, int r) {
if (l < r) {
int m = l + (r - l) / 2;
mergeSort(arr, l, m);
mergeSort(arr, m + 1, r);
merge(arr, l, m, r);
}
}
int main() {
int arr[] = { 5, 9, 2, 8, 3, 7, 1, 6, 4, 10 };
int n = sizeof(arr) / sizeof(arr[0]);
mergeSort(arr, 0, n - 1);
cout << "排序后的数组为:\n";
for (int i = n - 1; i >= 0; i--)
cout << arr[i] << " ";
cout << endl;
return 0;
}
```
程序输出:
```
排序后的数组为:
10 9 8 7 6 5 4 3 2 1
```
阅读全文