小熊的果篮

#include<iostream>
#include<list>
using namespace std;
int n;
struct node
{
	int val;
	int num;	
};
list<node> List;
int main()
{
	//freopen("fruit.in","r",stdin);
	//freopen("fruit.out","w",stdout);
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		int x;scanf("%d",&x);
		List.push_back(node{x,i});
	}
	while(!List.empty())
	{
		int prev=-1;
		list<node>::iterator it=List.begin();
		for(it=List.begin();it!=List.end();it++)
		{
			if(prev!=it->val)
			{
				printf("%d ",it->num);
				List.erase(it);
			}
			prev=it->val;
		}
		cout<<endl;
	}
	return 0;
} 

RE了？