C++ 代码

# include <iostream>
using namespace std;
const int N = 1e5 + 10;
int q[N], tmp[N], n;
void merge_sort(int q[], int l, int r)
{
    // 递归出口
    if(l >= r) return;
    // 取中间值
    int mid = l + r >> 1;
    // 递归过程
    merge_sort(q, l, mid), merge_sort(q, mid + 1, r);
    // 归并过程
    int k = 0, i = l, j = mid + 1;
    while (i <= mid && j <= r)
        if (q[i] <= q[j]) tmp[k ++] = q[i ++];
        else tmp[k ++] = q[j ++];
    while (i <= mid) tmp[k ++] = q[i ++];
    while (j <= r) tmp[k ++] = q[j ++];
    // 复制过程
    for (i = l, j = 0; i <= r; i ++, j ++) q[i] = tmp[j];
}
int main()
{
    scanf("%d", &n);
    for (int i = 0; i < n; i ++) scanf("%d", &q[i]);
    merge_sort(q, 0, n - 1);
    for (int i = 0; i < n; i ++) printf("%d ", q[i]);
    return 0;
}