CCF CSP 201612-3权限查询

按题意模拟，一层层嵌套，有注释

#include<iostream>
#include<map>
#include<string>
#include<algorithm>
using namespace std;
map<string,int>category,cy;
map<string,map<string, int> >role;
map<string,map<string, int> >user;
int main(){
	int n;
	cin>>n;
	//存储权限 
	for(int i = 0; i < n; i++){
		string s;
		cin>>s;
		int f = -1;
		//分有权限和无权限两种 
		if((f = s.find(':'))!=-1){
			int num = 0;
			for(int j = f+1; j < s.size(); j++){
				num = num * 10 + s[j]-'0';
			}
			category[s.substr(0,f)] = num;
		}
		else category[s] = -1;
	}
	cin>>n;
	//存储权限 
	for(int i = 0; i < n; i++){
		string str,s;
		int m;
		cin>>str>>m;
		cy.clear();
		for(int k = 0; k < m; k++){
			cin>>s;
			int f = -1;	
			//带权限的存储最大权限，无权限的存储为-1 
			if((f = s.find(':'))!=-1){
				int num = 0;
				for(int j = f+1; j < s.size(); j++){
					num = num * 10 + s[j]-'0';
				}
				if(cy.count(s.substr(0,f))){
					cy[s.substr(0,f)] = max(cy[s.substr(0,f)],num);
				}
				else{
					cy[s.substr(0,f)] = num;
				}
			}
			else cy[s] = -1;
		}
		role[str] = cy;
	}
	//存储角色	
	cin>>n;
	for(int i = 0; i < n; i++){
		string str,s;
		int m;
		cin>>str>>m;
		cy.clear();
		for(int k = 0; k < m; k++){
			cin>>s;
			int f = -1;	
			//遍历角色中的权限，替换到用户中 
			map<string,int> mp = role[s];
			for(map<string,int>::iterator it = mp.begin(); it != mp.end(); it++){
				if(cy.count(it->first)){
					cy[it->first] = max(cy[it->first],it->second);
				}
				else{
					cy[it->first] = it->second;
				}
			}
		}
		user[str] = cy;
	}
//	for(map<string,map<string,int> > ::iterator it = user.begin(); it != user.end(); it++){
//		cout<<it->first<<":";
//		for(map<string,int>::iterator it1 = it->second.begin(); it1 != it->second.end(); it1++){
//			cout<<it1->first<<"  "<<it1->second<<" ";
//		}
//		cout<<endl;
//	}
	cin>>n;
	for(int i = 0; i < n; i++){
		string name,privilege;
		cin>>name>>privilege;
		//是否有该用户 
		if(user.count(name)){
			int f = -1;
			//是否是带权限查询 
			if((f = privilege.find(':'))!=-1){
				int num = 0;
				for(int j = f+1; j < privilege.size(); j++){
					num = num * 10 + privilege[j]-'0';
				}
				//权限是否存在 
				if(user[name].count(privilege.substr(0,f))){
					if(user[name][privilege.substr(0,f)] >= num){
						cout<<"true";
					}
					else{
						cout<<"false";
					}
				}
				else{
					cout<<"false";
				}
			}
			else{
				if(user[name].count(privilege)){
					if(user[name][privilege] == -1)
						cout<<"true";
					else{
						cout<<user[name][privilege];
					}
				}
				else{
					cout<<"false";
				}
			}
		}
		else{
			cout<<"false";
		}
		cout<<endl;
	}
	return 0;
}