PAT (Advanced Level) 1022. Digital Library (30)

#include<iostream>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<cstdio>
#include<map>
#include<queue>
#include<vector>
using namespace std;

struct X
{
    string id;
    char title[90]; int Title;
    char author[90]; int Author;
    vector<int>key;
    char publisher[90]; int Publisher;
    int year;
}s[10000+10];
int n,m;

map<string,int>Tit,Aut,Key,Pub;
vector<string>ans;
int tot_Tit=0,tot_Aut=0,tot_Key=0,tot_Pub=0;

bool cmp(const X&a,const X&b)
{
    return a.id<b.id;
}

int main()
{
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
    {
        cin>>s[i].id; getchar();
        gets(s[i].title); if(Tit[s[i].title]==0) Tit[s[i].title]=++tot_Tit; s[i].Title=Tit[s[i].title];
        gets(s[i].author); if(Aut[s[i].author]==0) Aut[s[i].author]=++tot_Aut; s[i].Author=Aut[s[i].author];
        char tmp[1000]; gets(tmp);
        int len=strlen(tmp);
        string q;
        for(int j=0;j<=len;j++)
        {
            if(tmp[j]==' '||tmp[j]=='