hdu1497(图书馆系统简单模拟）

新手出品 

题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=1497 

#include <iostream>
#include<stdio.h>

#include<string.h>
using namespace std;

struct node1
{
    int ID;
	int date;	
}p[2000];

struct node2
{
	int ID;
	int person;
	int At;
}b[200000];
int main(){
	cin.sync_with_stdio(false);
    int M,N,i;
    while(cin>>M>>N)
    {
    	for(i=1;i<=N;i++)
    	{
    		b[i].ID=i;
    		b[i].person=0;
    		b[i].At=1;
		}
    	for(i=1;i<=M;i++)
    	{
    		p[i].ID=i;
    		p[i].date=0;
		}
		int t;
		cin>>t;
	    
		
	    while(t--)
		{
			char s;
			cin>>s;
			cin.get();
			if(s=='R')
			{
				int id;
				cin>>id;
				if(b[id].At==1)
				{
					cout<<"The book is already in the library"<<endl;
				}
				else 
				{
					cout<<"Return success"<<endl;
					p[b[id].person].date-=1;
					b[id].person=0;
					b[id].At=1;
				}
			}
			if(s=='B')
			{
				int m,n;
				cin>>m>>n;
			    if(b[n].At==0)
				{
					cout<<"The book is not in the library now"<<endl;
				}
				else if(p[m].date>=9)
				{
					cout<<"You are not allowed to borrow any more"<<endl;
				}
				
				else 
				{
					cout<<"Borrow success"<<endl;
					p[m].date+=1;
					b[n].At=0;
					b[n].person=m;
				}
			}
			if(s=='Q')
			{
				int id;
				cin>>id;
				if(p[id].date==0)
				{
					cout<<"Empty"<<endl;
				}
				else 
				{
					int k;
					for(i=1,k=1;i<=N;i++)
					{
						if(b[i].person==id)
						{
							if(k==1)
							{
							   cout<<b[i].ID;
							   k++;	
							}
							else
							{
							   cout<<' '<<b[i].ID;	
							} 
						}
					}
					cout<<endl;
				}
			}
		}
		cout<<endl;
	}
    return 0;
}