Deloitte | COGNIZANT | IBM | CAPGEMINI
#include <bits/stdc++.h>
using namespace std;
class LibrarySystem {
private:
unordered_map<int, int> bookBorrower;
unordered_map<int, bool> bookStatus;
unordered_map<int, unordered_set<int>> userBooks;
unordered_map<int, int> userIssuedCount;
map<pair<int,int>, int> userBookCount;
unordered_map<int, int> bookFrequency;
public:
LibrarySystem(){}
bool checkout(int library_card_id, int book_id) {
if(userIssuedCount[library_card_id] >= 50) return false;
if(userBooks[library_card_id].size() >= 5) return false;
if(bookStatus.find(book_id)!=bookStatus.end() && bookStatus[book_id]==false)
return false;
if(userBookCount[{library_card_id, book_id}] >= 3) return false;
bookStatus[book_id] = false;
bookBorrower[book_id] = library_card_id;
userBooks[library_card_id].insert(book_id);
userIssuedCount[library_card_id]++;
userBookCount[{library_card_id, book_id}]++;
bookFrequency[book_id]++;
return true;
}
bool returnBook(int library_card_id, int book_id){
if(bookBorrower.find(book_id)==bookBorrower.end()) return false;
if(bookBorrower[book_id]!=library_card_id) return false;
if(bookStatus[book_id]==true) return false;
bookStatus[book_id] = true;
bookBorrower.erase(book_id);
userBooks[library_card_id].erase(book_id);
return true;
}
bool available(int book_id){
if(bookStatus.find(book_id)==bookStatus.end()) return true;
return bookStatus[book_id];
}
int borrower(int book_id){
if(bookBorrower.find(book_id)==bookBorrower.end()) return -1;
return bookBorrower[book_id];
}
int count(int library_card_id){
return userIssuedCount[library_card_id];
}
int frequency(int book_id){
return bookFrequency[book_id];
}
};
Library system ✅
//SIEMENS
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