UVa 10935 - Throwing Cards Away I

#include <bits/stdc++.h>
#define LL  long long
#define SZ(x) ((int)(x).size())
#define ALL(x) (x).begin(),(x).end()
#define REP(i,n) for(int i=0;i<n;i++)
#define REV(i,n) for(int i=n-1;i>=0;i--)
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define pri(a) cout<<a<<endl
#define prii(a,b) cout<<a<<" "<<b<<endl
#define priii(a,b,c) cout<<a<<" "<<b<<" "<<c<<endl
#define hi printf("Hello World\n")
#define pcs printf("CASE# %d:\n", ++cs);
#define WRITE(fn) freopen(fn, "w", stdout);
using namespace std;

/****/ int cs = 0;
const int INF = 1<<29;
const int MX  = 1e5+10;

int main()
{
    int n,x;

    while(cin>>n and n)
    {
        queue <int> q;

        FOR(i,1,n) q.push(i);

        printf("Discarded cards:");

        while(SZ(q)>1)
        {
            printf(" %d", q.front());
            q.pop();

            x = q.front();
            q.push(x);

            q.pop();

            if(SZ(q) > 1) printf(",");
        }

        printf("\nRemaining card: %d\n", q.front());
    }
    return 0;
}