nextpermutation的错误

#include<bits/stdc++.h>
using namespace std;

int n;

int a[10];

int main(){
	
	cin>>n;
	
	for(int i=1;i<=n;i++){
		
		a[i]=i;
		
	}
	
	do{
		
		for(int i=1;i<=n;i++){
			
			printf("    %d    %d    %d",a[i]);
			
		}	
		
		cout<<endl;
		
	}while(next_permutation(a+1,a+n+1));
	
	
	
	
	
	return 0;
}