谷样例似乎过了，wa求调。

#include <bits/stdc++.h>
using namespace std;
const double EPS=1e-5;
namespace A_Typical_Homework{
	using namespace std;
	struct score{
		int a[10];
		int& operator[](int i){
			return a[i];
		}
		friend istream& operator>>(istream& in,score& b){
			in>>b[1]>>b[2]>>b[3]>>b[4];
			return in;
		}
		friend ostream& operator<<(ostream& out,score& b){
			out<<b[1]<<' '<<b[2]<<' '<<b[3]<<' '<<b[4];
			return out;
		}
		score& operator=(score& b){
			for(int i=1; i<=6; i++)this->a[i]=b[i];
			return *this;
		}

	};
	struct student{
		string name,sid;
		int cid;
		score sco;
		bool remov;
		student(){
            remov=0;
			name="";
			sid="";
			for(int i=1; i<=6; i++)sco[i]=0;
			cid=0;
		}
		student& operator=(student& a){
			this->cid=a.cid;
			this->sid=a.sid;
			this->name=a.name;
			this->sco=a.sco;
			return *this;
		}
		friend istream& operator>>(istream& in,student& tmp){
			in>>tmp.cid>>tmp.name>>tmp.sco;
			return in;
		}
		friend ostream& operator<<(ostream& out,student& tmp){
			out<<tmp.sid<<' '<<tmp.cid<<' '<<tmp.name<<' '<<tmp.sco<<' ';
			return out;
		}
	} stu[1000];
	int cnt=0;
	bool is_same_sid(student stu_tmp){
		for(int i=1; i<=cnt; i++) {
			if(stu_tmp.sid==stu[i].sid)return true;
		}
		return false;
	}
	void join(student stu_tmp){
		stu[++cnt]=stu_tmp;
	}
	bool is_sid(string s){
		if(s[0]>='0'&&s[0]<='9')return 1;
		else return 0;
	}
	int find_sid_or_name_cnt_and_del_it(string s){
		int ans;
		if(is_sid(s)){
			for(int i=1;i<=cnt;i++){
				if(stu[i].sid==s&&!stu[i].remov){
					ans++;
					stu[i].remov=1;
				}
			}
		}
		else{
			for(int i=1;i<=cnt;i++){
				if(stu[i].name==s&&!stu[i].remov){
					ans++;
					stu[i].remov=1;
				}
			}			
		}
		return ans;
	}
	int total(student stud){
		int tot=0;
		for(int i=1;i<=6;i++)tot+=stud.sco[i];
		return tot;
	}
	int rank(student stud){
		int ans=1;
		for(int i=1;i<=cnt;i++){
			if(!stu[i].remov&&total(stu[i])>total(stud))ans++;			
		}
		return ans;
	}
	int type(string s){
		if(s=="Chinese")return 1;
		if(s=="Mathematics")return 2;
		if(s=="English")return 3;
		if(s=="Programming")return 4;
	}
	void part_subject(string subjects,int class_need){
		cout<<subjects<<'\n';
		int sub_type=type(subjects);
		int pass=0,fail=0,sum=0,num=0;
		double avg;
		if(class_need){
			for(int i=1;i<=cnt;i++){
				if(!stu[i].remov&&stu[i].cid==class_need){
					num++;
					sum+=stu[i].sco[sub_type];
					if(stu[i].sco[sub_type]>=60)pass++;
					else fail++;
				}
			}
		}
		else{
			for(int i=1;i<=cnt;i++){
				if(!stu[i].remov){
					num++;
					sum+=stu[i].sco[sub_type];
					if(stu[i].sco[sub_type]>=60)pass++;
					else fail++;
				}
			}
		}
		if(num){
			avg=sum/(num+0.0)+EPS;
			cout<<"Average Score: "<<fixed<<setprecision(2)<<avg<<'\n';
			cout<<"Number of passed students: "<<pass<<'\n';
			cout<<"Number of failed students: "<<fail<<'\n'<<'\n';
		}
		else{
			cout<<"Average Score:-nan"<<'\n';
			cout<<"Number of passed students: "<<pass<<'\n';
			cout<<"Number of failed students: "<<fail<<'\n'<<'\n';		
		}
	}
	void over_alls(int class_need){
		int answer[]={0,0,0,0,0};
		if(class_need){
			for(int i=1;i<=cnt;i++){
				int array_=0;
				if(!stu[i].remov&&stu[i].cid==class_need){
					for(int j=1;j<=4;j++){
						if(stu[i].sco[j]>=60)array_++;
					}
					if(array_){
						for(int j=array_;j>0;j--){
							answer[j]++;
						}
					}
					else answer[array_]++;
				}
			}
		}	
		else{
			for(int i=1;i<=cnt;i++){
				int array_=0;
				if(!stu[i].remov){
					for(int j=1;j<=4;j++){
						if(stu[i].sco[j]>=60)array_++;
					}
					if(array_){
						for(int j=array_;j>0;j--){
							answer[j]++;
						}
					}
					else answer[array_]++;
				}
			}				
		}
		cout<<"Overall:"<<'\n';
		cout<<"Number of students who passed all subjects: "<<answer[4]<<'\n';
		cout<<"Number of students who passed 3 or more subjects: "<<answer[3]<<'\n';
		cout<<"Number of students who passed 2 or more subjects: "<<answer[2]<<'\n';
		cout<<"Number of students who passed 1 or more subjects: "<<answer[1]<<'\n';
		cout<<"Number of students who failed all subjects: "<<answer[0]<<'\n'<<'\n';
		
	}
	void greet(){
		cout<<"Welcome to Student Performance Management System (SPMS)."<<endl;
		cout<<endl;
		cout<<"1 - Add"<<endl;
		cout<<"2 - Remove"<<endl;
		cout<<"3 - Query"<<endl;
		cout<<"4 - Show ranking"<<endl;
		cout<<"5 - Show Statistics"<<endl;
		cout<<"0 - Exit"<<endl;
		cout<<endl;
	}
	void add(){
		for(;;){
			cout<<"Please enter the SID, CID, name and four scores. Enter 0 to finish."<<'\n';
			student tmp;
			cin>>tmp.sid;
			if(tmp.sid=="0")return;
			cin>>tmp;
			if(!is_same_sid(tmp)){
				join(tmp);
			} 
            	else cout<<"Duplicated SID."<<'\n';
		}
	}
	void remove(){
		int ans;
		for(;;){
			cout<<"Please enter SID or name. Enter 0 to finish."<<'\n';
			string s;		
            	cin>>s;	
			if(s=="0")return;
			ans+=find_sid_or_name_cnt_and_del_it(s);
			cout<<ans<<" student(s) removed."<<'\n';	
		}	
	}
	void query(){
		for(;;){
			cout<<"Please enter SID or name. Enter 0 to finish."<<'\n';
			string s;
			cin>>s;
			if(s=="0")return;
			if(is_sid(s)){
				for(int i=1;i<=cnt;i++){
					int ans=total(stu[i]);
					double avg=ans/4.0+EPS;
					if(s==stu[i].sid)cout<<rank(stu[i])<<' '<<stu[i]<<ans<<' '<<fixed<<setprecision(2)<<avg<<'\n';
				}
			}
			else{
				for(int i=1;i<=cnt;i++){
					int ans=total(stu[i]);
					double avg=ans/4.0+EPS;
					if(s==stu[i].name)cout<<rank(stu[i])<<' '<<stu[i]<<ans<<' '<<fixed<<setprecision(2)<<avg<<'\n';
				}
			}	
		}
	}
	void show_ranking(){
		cout<<"Showing the ranklist hurts students' self-esteem. Don't do that."<<'\n';
	}
	void show_statistics(){
		cout<<"Please enter class ID, 0 for the whole statistics."<<'\n';
      	int class_cin;
      	cin>>class_cin;
      	part_subject("Chinese",class_cin);
      	part_subject("Mathematics",class_cin);
      	part_subject("English",class_cin);
      	part_subject("Programming",class_cin);
      	over_alls(class_cin);
	}
}
int main(){
	for(;;){
		A_Typical_Homework::greet();
		int opt;
		cin>>opt;
		if(opt==0)break;
		else if(opt==1)A_Typical_Homework::add();
		else if(opt==2)A_Typical_Homework::remove();
		else if(opt==3)A_Typical_Homework::query();
		else if(opt==4)A_Typical_Homework::show_ranking();
		else if(opt==5)A_Typical_Homework::show_statistics();
	}
	return 0;
}