记录编号	189792	评测结果	AAAAAAAAAA
题目名称	[USACO Open09] 奶牛队列	最终得分	100
用户昵称	琴殇''遙暩焱鐄	是否通过	通过
代码语言	C++	运行时间	0.223 s
提交时间	2015-09-29 20:27:01	内存使用	1.84 MiB

#include <algorithm>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <cmath>

#define MAXS 400005
#define MIDS 200000

using namespace std;

int s, queue[MAXS], cnt, lv;
int lsz = MIDS, rsz = MIDS + 1;
char io, rl;

int main ()
{
	freopen ("cline.in", "r", stdin);
	freopen ("cline.out", "w", stdout);
	
	scanf ("%d\n", &s);
	
	for (int i = 1; i <= s; i ++)
	{
		scanf ("%c %c", &io, &rl);
		switch (io)
		{
			case 'A' :
				getchar ();
				switch (rl)
				{
					case 'L' :
						queue[lsz --] = ++ cnt;
						break;
					case 'R' :
						queue[rsz ++] = ++ cnt;
						break;
				}
				break;
			
			case 'D' :
				scanf (" %d", &lv);
				if (i != s) getchar ();
				switch (rl)
				{
					case 'L' :
						lsz = (lsz + lv > rsz - 1) ? rsz - 1 : lsz + lv;
						break;
					case 'R' :
						rsz = (rsz - lv < lsz + 1) ? lsz + 1 : rsz - lv;
						break;
				}
				break;
		}
	}
	
	for (int i = lsz + 1; i < rsz; i ++)
		printf ("%d\n", queue[i]);
	
	return 0;
}