HDU 2093(考试排名)解题纠错

以下来自点击打开链接

#include <iostream>#include <iomanip>#include<algorithm>#include <string>#include <vector>using namespace std;class Problem{public:    Problem();    int GetGrade();    static void SetPunish();private:    int accept_time;    int wrong_times;    static int punish;};Problem::Problem()    {        int temp;        cin>>temp;        if(temp<0)        {            this->wrong_times = -temp;            this->accept_time = 0;        }        else        {            if(temp==0)            {                this->wrong_times = 0;                this->accept_time = 0;            }            else            {                this->accept_time = temp;                if( cin.get()=='(')                {                    cin>>this->wrong_times;                    cin.get();                }                else                {                    this->wrong_times = 0;                }            }        }    }int Problem::GetGrade(){    if( this->accept_time==0 )    {        return 0;    }    else    {        return this->accept_time + this->wrong_times * this->punish;    }}void Problem::SetPunish(){    cin>>Problem::punish;}class Student{public:    Student();    void Calculate();    int GetGrade();    int GetAccept();    string& GetName();    void print();    static void SetPeople();private:    string name;    Problem *questions;    int accept_problem;    int grade;    static int people;};Student::Student(){    cin>>this->name;    this->questions = new Problem[this->people];    this->Calculate();}inline string& Student::GetName(){    return this->name;}inline int Student::GetAccept(){    return this->accept_problem;}inline int Student::GetGrade(){    return this->grade;}void Student::Calculate(){    int i, grade;    this->accept_problem = 0;    this->grade = 0;    for(i = 0; i < this->people; i++)    {        grade = this->questions[i].GetGrade();        if( grade )        {            this->grade += grade;            this->accept_problem += 1;        }    }}void Student::SetPeople(){    cin>>Student::people;}bool compare(Student &a,Student &b);bool compare(Student &a,Student &b){    if( a.GetAccept() < b.GetAccept() )    {        return false;    }    if( a.GetAccept() > b.GetAccept() )    {        return true;    }    if( a.GetGrade() < b.GetGrade() )    {        return true;    }    if( a.GetGrade() > b.GetGrade() )    {        return false;    }    if( a.GetName().compare( b.GetName() ) < 0 )    {        return true;    }    else    {        return false;    }}void Student::print(){    cout<<setw(10)<<left<<this->GetName()<<" "<<right<<setw(2)<<this->GetAccept()<<" "<<right<<setw(4)\        <<this->GetGrade()<<endl;}int Problem::punish = 0;int Student::people = 0;int main(){    Student *p;    vector<Student>students;    Student::SetPeople();    Problem::SetPunish();    while( cin.peek()!=EOF )    {        p = new Student();        students.push_back(*p);        cin.get();    }    sort(students.begin(),students.end(),compare);    int i = students.size(),j;    for(j = 0; j < i; j++)    {        students[j].print();    }    return 0;}

设有以下输入：

1 20
Smith 10
John 20

John的第1个字符被该程序中cin.get()吃掉，变成了ohn。

另外，有时会多出1个数值全为0的记录。

问题出在cin.peek()!=EOF 这个条件，它不能及时地发挥作用。还是要判读入的人名是否为空。

还有，程序中的变量名people改为problem_number较为确切。

以下修改AC:

#include <iostream>#include <iomanip>#include<algorithm>#include <string>#include <vector>using namespace std;class Problem{public:    Problem();    int GetGrade();    static void SetPunish();private:    int accept_time;    int wrong_times;    static int punish;};Problem::Problem()    {        int temp;        char c;        cin>>temp;        if(temp<0)        {            this->wrong_times = -temp;            this->accept_time = 0;        }        else        {            if(temp==0)            {                this->wrong_times = 0;                this->accept_time = 0;            }            else            {                this->accept_time = temp;                if( (c=cin.get())=='(')                {                    cin>>this->wrong_times;                    cin.get();                }                else                {                    this->wrong_times = 0;                }            }        }    }int Problem::GetGrade(){    if( this->accept_time==0 )    {        return 0;    }    else    {        return this->accept_time + this->wrong_times * this->punish;    }}void Problem::SetPunish(){    cin>>Problem::punish;}class Student{public:    Student();    void Calculate();    int GetGrade();    int GetAccept();    string& GetName();    void print();    static void SetPeople();private:    string name;    Problem *questions;    int accept_problem;    int grade;    static int people;};Student::Student(){    cin>>this->name;    if (!this->name.empty())//加    {      this->questions = new Problem[this->people];      this->Calculate();    }}inline string& Student::GetName(){    return this->name;}inline int Student::GetAccept(){    return this->accept_problem;}inline int Student::GetGrade(){    return this->grade;}void Student::Calculate(){    int i, grade;    this->accept_problem = 0;    this->grade = 0;    for(i = 0; i < this->people; i++)    {        grade = this->questions[i].GetGrade();        if( grade )        {            this->grade += grade;            this->accept_problem += 1;        }    }}void Student::SetPeople(){    cin>>Student::people;}bool compare(Student &a,Student &b);bool compare(Student &a,Student &b){    if( a.GetAccept() < b.GetAccept() )    {        return false;    }    if( a.GetAccept() > b.GetAccept() )    {        return true;    }    if( a.GetGrade() < b.GetGrade() )    {        return true;    }    if( a.GetGrade() > b.GetGrade() )    {        return false;    }    if( a.GetName().compare( b.GetName() ) < 0 )    {        return true;    }    else    {        return false;    }}void Student::print(){    cout<<setw(10)<<left<<this->GetName()<<" "<<right<<setw(2)<<this->GetAccept()<<" "<<right<<setw(4)\        <<this->GetGrade()<<endl;}int Problem::punish = 0;int Student::people = 0;int main(){    Student *p;    vector<Student>students;    Student::SetPeople();    Problem::SetPunish();    while( cin.peek()!=EOF )    {        p = new Student();        if (!p->GetName().empty())//加        students.push_back(*p);        //删 cin.get();    }    sort(students.begin(),students.end(),compare);    int i = students.size(),j;    for(j = 0; j < i; j++)    {        students[j].print();    }    return 0;}