UVa 10935 - Throwing cards away I（模拟）

#include<iostream>
#include<vector>
using namespace std;
int n;
vector<int>cards;
int main()
{
while(cin>>n&&n)
{
int first=1;
for(int i=1;i<=n;i++)
cards.push_back(i);
cout<<"Discarded cards:";
while(!cards.empty())
{
if(cards.size()==1)
break;
if(first)
{
first=0;
cout<<" ";
}
else
cout<<", ";
cout<<cards[0];
cards.erase(cards.begin());
cards.push_back(cards[0]);
cards.erase(cards.begin());
}
cout<<endl;
cout<<"Remaining card: "<<cards[0]<<endl;
cards.clear();
}
return 0;
}