rt,先将序列随机排列 m 次,然后取最趋近于有序的一个序列(具体怎么找到可以看代码),对这个序列进行插入排序,平均时间复杂度未知,但是开了 O2 能过。
实测 m 取 10 跑的比较快。
代码:
#include <bits/stdc++.h>
using namespace std;
int a[100010], b[100010];
void my_sort(int n, int m)
{
long long minn = 0;
for (int i = 1; i < n; i++) minn += max(0, a[i] - a[i + 1]);
mt19937 random(time(0));
while (m--)
{
for (int i = 1; i <= n; i++) b[i] = a[i];
shuffle(b + 1, b + n + 1, random);
long long sum = 0;
for (int i = 1; i < n; i++) sum += max(0, b[i] - b[i + 1]);
if (sum < minn)
{
minn = sum;
for (int i = 1; i <= n; i++) a[i] = b[i];
}
}
for (int i = 2; i <= n; i++)
{
int t = i;
while (a[t] < a[t - 1])
{
swap(a[t], a[t - 1]);
t--;
}
}
}
int main()
{
ios::sync_with_stdio(0);
cin.tie(0), cout.tie(0);
int n;
cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
my_sort(n, 10);
for (int i = 1; i <= n; i++) cout << a[i] << " ";
return 0;
}