UVA 230 Borrowers(vector和map的应用,模拟)

 1 //#include<bits/stdc++.h>
 2 #include<cstdio>
 3 #include<queue>
 4 #include<algorithm>
 5 #include<cstring>
 6 #include<string>
 7 #include<iostream>
 8 using namespace std;
 9 typedef long long ll;
10 /**
11     题意:SHELVE指令表示把所有已归还但还未上架的图书排序后依次插入书架
12             排序方法:先作者从小到大,再标题从小到大
13        需要用到一些string类的方法  ,如果用C,需要用到cstring的一些方法
14     思路:
15         结构体Book保存信息,status表示图书状态,放入vector中
16
17     上面那个思路龊了,但因为懒,代码就不改了
18     **************
19     ：加入用vector保存图书信息,在还书和借书改变status时,需要遍历vector,妈呀太浪费资源了
20     正确的姿势应该是
21         用vector<string> title 保存书名
22         用map<string,book> books    K：书名  V：book中存放 author和 status
23         这样在排序vector时:vector用 map里的信息排序
24             bool compare(string a, string b){
25                 if(books[a].author == books[b].author) return a < b;
26                 else return books[a].author < books[b].author;
27             }
28         SHELVE操作时候
29             for(int i = 0; i < title.size(); i++)
30                 if(books[title[i]].status == 0){
31                     int j;
32                     for(j = i; j >= 0; --j)
33                         if(books[title[j]].status == 1) break;
34                 }
35 */
36 struct Book{
37     string title;
38     string author;
39     int status;
40 };
41 bool cmp(Book b1,Book b2){
42     if(b1.author == b2.author)
43         return b1.title < b2.title;
44     return b1.author < b2.author;
45 }
46 vector<Book> vec;
47 int main(){
48
49     string str,op,name,title,author;
50     while(getline(cin,str)){
51         if(str == "END") break;
52         int pos = str.find_last_of("\"");
53         title = str.substr(0,pos+1);    //不包含pos
54         author = str.substr(pos+5);     //包含pos
55         Book tmp; tmp.author = author; tmp.title = title;
56         tmp.status = 1;
57         vec.push_back(tmp);
58     }
59     sort(vec.begin(),vec.end(),cmp);
60     while(cin >> op){
61         if(op == "END") break;
62         getchar();
63         if(op == "BORROW"){
64             getline(cin,name);
65             for(int i = 0 ; i < vec.size() ; i ++){
66                 if(vec[i].title == name){
67                     vec[i].status = -1;
68                     break;
69                 }
70             }
71         }else if(op == "RETURN"){
72             getline(cin,name);
73             for(int i = 0 ; i < vec.size() ; i ++){
74                 if(vec[i].title == name){
75                     vec[i].status = 0;
76                     break;
77                 }
78             }
79         }else if(op == "SHELVE"){
80             for(int i = 0 ; i < vec.size() ; i ++){
81                 int index1 = 0 , index2 = -1;
82                 if(vec[i].status == 0){
83                     index1 = i;
84                     for(int j = index1 - 1 ; j >= 0 ; j --){
85                         if(vec[j].status == 1){
86                             index2 = j;
87                             break;
88                         }
89                     }
90                     if(index2 == -1) cout << "Put " << vec[index1].title << " first" << endl;
91                     else    cout << "Put " << vec[index1].title << " after " << vec[index2].title << endl;
92                     vec[index1].status = 1;
93                 }
94             }
95             cout << "END" << endl;
96         }
97     }
98     return 0;
99 }