排列的字典序

#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<algorithm>
using namespace std;
long long  a[14],j[15]={1,1,2,6,24,120,720,5040,40320,362880,3628800,39916800,479001600};
int n,sum=0;
int ronaldo(int x,int y,int z)
{
	if (x==1) return a[x]-1;
	if (x==n) return 1;
	for (int f=1;f<=x-1;f++)
		if (a[z]>a[f]) y--;
	return y-1;
}
int main()
{
	scanf("%d",&n);
	for (int i=1;i<=n;i++)
		scanf("%d",&a[i]);
	for (int i=1;i<=n;i++)
		sum=sum+ronaldo(i,a[i],i)*j[n-i];
	cout<<sum-1<<endl;//因爲從0開始算第一個
	next_permutation(a+1,a+n+1);
	for (int i=1;i<=n;i++)
		cout<<a[i]<<" ";
}