uDebug的数据和Luogu样例都已经过了

#include<bits/stdc++.h>
using namespace std;
struct Student{
    string name,sid,cid;
    int chinese,math,english,program,sum,rank;
    bool cz;
}student[205];
int st;
bool cmp(Student x,Student y){
    if(x.cz==0&&y.cz==0) return x.sum>y.sum;
    else return x.cz<y.cz;
}
bool cmp2(Student x,Student y){
    if(x.cz==0&&y.cz==0) return x.sid<y.sid;
    else return x.cz<y.cz;
}
void SPMS_AddStudent(){
    sort(student,student+st,cmp);
    student[st].cz=0;
    while(true){
        printf("Please enter the SID, CID, name and four scores. Enter 0 to finish.\n");
        cin>>student[st].sid;
        if(student[st].sid=="0") return;
        cin>>student[st].cid>>student[st].name>>student[st].chinese>>student[st].math>>student[st].english>>student[st].program;
        student[st].sum=student[st].chinese+student[st].math+student[st].english+student[st].program;
        bool f=1;
        for(int i=0;i<st;i++){
            if(student[st].sid==student[i].sid&&student[st].cz==0){
                printf("Duplicated SID.\n");
                f=0;
                break;
            }
        }
        student[st].cz=0;
        if(f) st++;
        student[st].cz=0;
    }
}
void SPMS_DelStudent(){
    while(true){
        printf("Please enter SID or name. Enter 0 to finish.\n");
        string ns;
        cin>>ns;
        if(ns=="0") return;
        int deld=0;
        for(int i=0;i<st;i++){
            if((ns==student[i].sid||ns==student[i].name)&&student[i].cz==0){
                deld++;
                student[i].cz=1;
            }
        }
        printf("%d student(s) removed.\n",deld);
        sort(student,student+st,cmp);
        st-=deld;
    }
}
void SPMS_Search(){
    sort(student,student+st,cmp);
    int score=student[0].sum,pm=0;
    for(int i=0;i<st;i++){
        if(score!=student[i].sum){
            score=student[i].sum;
            pm=i;
        }
        student[i].rank=pm+1;
    }
    sort(student,student+st,cmp2);
    while(true){
        printf("Please enter SID or name. Enter 0 to finish.\n");
        string ns;
        cin>>ns;
        if(ns=="0") return;
        for(int i=0;i<st;i++){
            if((ns==student[i].sid||ns==student[i].name)&&student[i].cz==0){
                cout<<student[i].rank<<" "<<student[i].sid<<" "<<student[i].cid<<" "<<student[i].name<<" ";
                printf("%d %d %d %d %d %.2lf\n",student[i].chinese,student[i].math,student[i].english,student[i].program,student[i].sum,((double)student[i].sum)/4);
            }
        }
    }
}
void SPMS_Ranking(){
    printf("Showing the ranklist hurts students' self-esteem. Don't do that.\n");
    return ;
}
void SPMS_Classes(){
    printf("Please enter class ID, 0 for the whole statistics.\n");
    string ns;
    cin>>ns;
    double Chinese_pjf=0,Math_pjf=0,English_pjf=0,Program_pjf=0;
    int Chinese_psd=0,Chinese_fld=0;
    int Math_psd=0,Math_fld=0;
    int English_psd=0,English_fld=0;
    int Program_psd=0,Program_fld=0;
    int Psd[5],studenttot=0;
    memset(Psd,0,sizeof(Psd));
    if(ns=="0"){
        for(int i=0;i<st;i++){
            studenttot++;
            int apsd=0;
            Chinese_pjf+=student[i].chinese;
            if(student[i].chinese>=60){
                Chinese_psd++;
                apsd++;
            }
            else Chinese_fld++;
            Math_pjf+=student[i].math;
            if(student[i].math>=60) {
                Math_psd++;
                apsd++;
            }
            else Math_fld++;
            English_pjf+=student[i].english;
            if(student[i].english>=60) {
                English_psd++;
                apsd++;
            }
            else English_fld++;
            Program_pjf+=student[i].program;
            if(student[i].program>=60) {
                Program_psd++;
                apsd++;
            }
            else Program_fld++;
            Psd[apsd]++;
        }
    }
    else{
        for(int i=0;i<st;i++){
            if(student[i].cid==ns&&student[i].cz==0){
                studenttot++;
                int apsd=0;
                Chinese_pjf+=student[i].chinese;
                if(student[i].chinese>=60){
                    Chinese_psd++;
                    apsd++;
                }
                else Chinese_fld++;
                Math_pjf+=student[i].math;
                if(student[i].math>=60) {
                    Math_psd++;
                    apsd++;
                }
                else Math_fld++;
                English_pjf+=student[i].english;
                if(student[i].english>=60) {
                    English_psd++;
                    apsd++;
                }
                else English_fld++;
                Program_pjf+=student[i].program;
                if(student[i].program>=60) {
                    Program_psd++;
                    apsd++;
                }
                else Program_fld++;
                Psd[apsd]++;    
            }
        }
    }
    printf("Chinese\n");
    if(studenttot!=0) printf("Average Score: %.2lf\n",Chinese_pjf/studenttot);
    else printf("Average Score: -nan\n");
    printf("Number of passed students: %d\n",Chinese_psd);
    printf("Number of failed students: %d\n",Chinese_fld);
    printf("\n");
    printf("Mathematics\n");
    if(studenttot!=0) printf("Average Score: %.2lf\n",Math_pjf/studenttot);
    else printf("Average Score: -nan\n");
    printf("Number of passed students: %d\n",Math_psd);
    printf("Number of failed students: %d\n",Math_fld);
    printf("\n");
    printf("English\n");
    if(studenttot!=0) printf("Average Score: %.2lf\n",English_pjf/studenttot);
    else printf("Average Score: -nan\n");
    printf("Number of passed students: %d\n",English_psd);
    printf("Number of failed students: %d\n",English_fld);
    printf("\n");
    printf("Programming\n");
    if(studenttot!=0) printf("Average Score: %.2lf\n",Program_pjf/studenttot);
    else printf("Average Score: -nan\n");
    printf("Number of passed students: %d\n",Program_psd);
    printf("Number of failed students: %d\n",Program_fld);
    printf("\n");
    printf("Overall:\n");
    printf("Number of students who passed all subjects: %d\n",Psd[4]);
    printf("Number of students who passed 3 or more subjects: %d\n",Psd[3]+Psd[4]);
    printf("Number of students who passed 2 or more subjects: %d\n",Psd[2]+Psd[3]+Psd[4]);
    printf("Number of students who passed 1 or more subjects: %d\n",Psd[1]+Psd[2]+Psd[3]+Psd[4]);
    printf("Number of students who failed all subjects: %d\n",Psd[0]);
    printf("\n");
}
void SPMS_main(){
    while(true){
        printf("Welcome to Student Performance Management System (SPMS).\n\n");
        printf("1 - Add\n");
        printf("2 - Remove\n");
        printf("3 - Query\n");
        printf("4 - Show ranking\n");
        printf("5 - Show Statistics\n");
        printf("0 - Exit\n");
        printf("\n");
        int willdo;
        scanf("%d",&willdo);
        if(willdo==0) return;
        else if(willdo==1) SPMS_AddStudent(); 
        else if(willdo==2) SPMS_DelStudent();
        else if(willdo==3) SPMS_Search();
        else if(willdo==4) SPMS_Ranking();
        else if(willdo==5) SPMS_Classes();
    }
    return ;
}
int main(){
    SPMS_main();
    return 0;
}