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#include <iostream>
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#include <cstring>
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#include <iomanip>
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#include <cstdlib>
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#include <fstream>
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#include <string>
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#include <cctype>
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using namespace std;
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const int SIZE=20;
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struct student
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{
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char classnum[SIZE]; //班级
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char id[SIZE]; //学号
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char name[SIZE]; //姓名
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int *score;
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};
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void input(student p[], string c_name[],int s_num,int c_num); //输入学生的成绩信息，包括学号、姓名、性别等基本信息和各科成绩
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void show(student p[], string c_name[],int s_num,int c_num); // 显示全部学生各科成绩信息；
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void statistic(student p[], string c_name[],int s_num,int c_num);//对各科分班进行成绩统计分析，计算总分、平均分、最高分、最低分、及格率等；
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void section(student p[], string c_name[],int s_num,int c_num); //统计各个科目各分数段人数及班级信息；
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void search(student p[], string c_name[],int s_num,int c_num); //按学号或姓名查找并显示某个学生的各科成绩；
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void sort(student p[], string c_name[],int s_num,int c_num); //按课程成绩或总分由高到低排序显示；
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void update(student p[], string c_name[],int s_num,int c_num); //更新某个学生的基本信息或课程成绩；
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void quicksort(int s[],int l,int r); //快速排序
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void fileout(student p[], string c_name[],int s_num,int c_num,int semester);//文件形式输出
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int main()
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{
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cout<<setw(25)<<" "<<"欢迎使用本系统！"<<endl;
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cout<<"********************************************************************************"<<endl<<endl;
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cout<<"****************************《学生成绩管理系统》********************************"<<endl<<endl;
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cout<<"********************************************************************************"<<endl;
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int n=0;
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int student_num;//学生数
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int semester;//学期
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int cour_num;//课程数
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cout<<"是否从文档中读取基础信息？（Y/N）：";
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char first_sel;
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cin>>first_sel;
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cin.get();
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while(tolower(first_sel)!='y'&&tolower(first_sel)!='n')
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{
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cout<<"输入有误，请重新输入（Y/N）：";
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cin>>first_sel;
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cin.get();
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}
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if(tolower(first_sel)=='y')
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{
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ifstream fin;
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n=1;
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cout<<"**************** 说明： ****************"<<endl;
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cout<<"**************** 如上次保存的文档名为student.txt ****************"<<endl;
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cout<<"**************** 则读取的文档名为basic_student.txt。 ****************"<<endl;
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cout<<"请输入基本信息文档名：";
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char _fname[SIZE];
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cin.getline(_fname,SIZE);
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fin.open(_fname);
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while(!fin.is_open())
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{
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cout<<"不能打开此文档名的文档，请重新输入：";
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cin.getline(_fname,SIZE);
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fin.open(_fname);
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}
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fin>>student_num;
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fin.get();
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fin>>semester;
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fin.get();
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fin>>cour_num;
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fin.get();
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fin.close();
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system("pause");
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system("cls");
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}
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else
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{
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cout<<setfill('=')<<setw(32);
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cout<<"请输入学生人数：";
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cin>>student_num;
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while(!cin.good())
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{
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cin.clear();
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cin.sync();
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cout<<"输入有误！请重新输入学生个数: ";
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cin>>student_num;
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cin.get();
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}
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cout<<"================";
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cout<<"请输入学期（以数字形式）：";
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cin>>semester;
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while(!cin.good())
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{
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cin.clear();
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cin.sync();
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cout<<"输入有误！请重新输入学期: ";
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cin>>student_num;
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cin.get();
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}
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cout<<setfill('=')<<setw(25);
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cout<<"请输入第 "<<semester<<" 学期的课程数目: ";
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cin>>cour_num;
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cin.get();
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while(!cin.good())
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{
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cin.clear();
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cin.sync();
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cout<<"输入有误！请重新输入第 "<<semester<<" 学期的课程数目: ";
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cin>>cour_num;
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cin.get();
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}
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}
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student *p=new student[student_num];
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string *cour_name=new string[cour_num];
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if(tolower(first_sel)=='y')
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{
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ifstream fin;
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cout<<"**************** 说明： ******************"<<endl;
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cout<<"**************** 如上次保存的文档名为student.txt ******************"<<endl;
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cout<<"**************** 则读取的文档名为course_student.txt。 ******************"<<endl;
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cout<<"请输入课程信息文档名：";
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char _fname[SIZE];
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cin.getline(_fname,SIZE);
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fin.open(_fname);
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while(!fin.is_open())
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{
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cout<<"不能打开此文档名的文档，请重新输入：";
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cin.getline(_fname,SIZE);
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fin.open(_fname);
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}
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for(int i=0;i<cour_num;i++)
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{
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getline(fin,cour_name[i]);
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}
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fin.close();
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system("pause");
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system("cls");
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}
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else
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{
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int i;
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for(i=0;i<cour_num;i++)
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{
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cout<<setfill('=')<<setw(25);
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cout<<"请输入第 "<<i+1<<" 个课程名：";
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cin>>cour_name[i];
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cin.get();
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}
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}
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int i;
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int **all_score=new int*[student_num];
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for(i=0;i<student_num;i++)
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all_score[i]=new int[cour_num];
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for(i=0;i<student_num;i++)
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p[i].score=&all_score[i][0];
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if(tolower(first_sel)=='y')
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{
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ifstream fin;
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cout<<"****************** 说明： ******************"<<endl;
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cout<<"****************** 如上次保存的文档名为student.txt ******************"<<endl;
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cout<<"****************** 则读取的文档名为student_student.txt。 ******************"<<endl;
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cout<<"请输入学生信息文档名：";
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char _fname[SIZE];
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cin.getline(_fname,SIZE);
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fin.open(_fname);
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while(!fin.is_open())
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{
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cout<<"不能打开此文档名的文档，请重新输入：";
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cin.getline(_fname,SIZE);
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fin.open(_fname);
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}
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int i;
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for(i=0;i<student_num;i++)
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{
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fin.get(p[i].classnum,SIZE);
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fin.get();
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fin.get(p[i].id,SIZE);
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fin.get();
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fin.getline(p[i].name,SIZE);
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for(int j=0;j<cour_num;j++)
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{
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fin>>*(p[i].score+j);
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fin.get();
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}
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}
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fin.close();
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}
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system("pause");
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system("cls");
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char select='a';
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while(select!='q')
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{
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cout<<"********************************************************************************"<<endl;
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cout<<"请输入选择："<<endl;
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cout<<"【1】输入基本信息 "<<"【2】显示成绩信息 "<<"【3】成绩统计分析"<<endl;
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cout<<"【4】统计各科各分数段人数 "<<"【5】查找某个学生的各科成绩 " <<"【6】由高到低显示成绩"<<endl;
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cout<<"【7】更新学生成绩 "<<"【8】保存学生与成绩信息 "<<"【9】结束"<<endl<<endl;
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cout<<"********************************************************************************"<<endl;
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cout<<"输入：";
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cin.get(select);
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cin.get();
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while(n==0&&select!='1')
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{
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cout<<"输入有误，请先输入基本信息！"<<endl;
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select='1';
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}
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if(select=='1')
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input(p,cour_name,student_num,cour_num);
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else if(select=='2')
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show(p,cour_name,student_num,cour_num);
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else if(select=='3')
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statistic(p,cour_name,student_num,cour_num);
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else if(select=='4')
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section(p,cour_name,student_num,cour_num);
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else if(select=='5')
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search(p,cour_name,student_num,cour_num);
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else if(select=='6')
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sort(p,cour_name,student_num,cour_num);
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else if(select=='7')
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update(p,cour_name,student_num,cour_num);
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else if(select=='8')
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fileout(p,cour_name,student_num,cour_num,semester);
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else if(select=='9')
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;
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else
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cout<<"输入有误，请重新输入： "<<endl;
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n++;
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}
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cout<<"********************************************************************************"<<endl;
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cout<<"欢迎使用，再见!"<<endl;
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delete p;
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delete cour_name;
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for(i=0;i<student_num;i++)
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delete[] all_score[i];
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delete all_score;
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return 0;
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}
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void input(student p[], string c_name[],int s_num,int c_num)
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{
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for(int i=0;i<s_num;i++)
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{
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if(i>0)
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{
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cout<<"《****************************************************************************》";
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cout<<"《****************************************************************************》";
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cout<<"《********************************请继续输入**********************************》";
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cout<<"《****************************************************************************》";
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cout<<"《****************************************************************************》";
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cout<<endl;
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}
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cout<<setfill('=')<<setw(25);
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cout<<"请输入第 "<<i+1<<"个学生的班级（例如：自动化1122）：";
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cin.get(p[i].classnum,SIZE);
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cin.get();
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while(!cin.good())
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{
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cin.clear();
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cin.sync();
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cout<<"输入有误！请重新输入: ";
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cin.get(p[i].classnum,SIZE);
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cin.get();
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}
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cout<<setfill('=')<<setw(24);
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cout<<"请输入"<<i+1<<"个学生的学号：";
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cin.get(p[i].id,SIZE);
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cin.get();
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while(!cin.good())
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{
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cin.clear();
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cin.sync();
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cout<<"输入有误！请重新输入: ";
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cin.get(p[i].id,SIZE);
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cin.get();
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}
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for(int k=0;k<s_num;k++)
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{
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if(k==i)
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k++;
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if(strcmp(p[k].id,p[i].id)==0)
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{
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cout<<setfill('=')<<setw(25);
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cout<<"与已有学生的学号重复，请重新输入：";
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cin.get(p[i].id,SIZE);
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cin.get();
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while(!cin.good())
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{
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cin.clear();
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cin.sync();
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cout<<"输入有误！请重新输入: ";
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cin.get(p[i].id,SIZE);
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cin.get();
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}
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}
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}
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cout<<setfill('=')<<setw(32);
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cout<<"请输入其姓名：";
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cin.getline(p[i].name,SIZE);
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while(!cin.good())
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{
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cin.clear();
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cin.sync();
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cout<<"输入有误！请重新输入: ";
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cin.getline(p[i].name,SIZE);
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}
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for(int j=0;j<c_num;j++)
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{
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cout<<setfill('=')<<setw(24);
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cout<<"请输入"<<c_name[j]<<"的成绩：";
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cin>>*(p[i].score+j);
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cin.get();
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while(!cin.good())
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{
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cin.clear();
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cin.sync();
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cout<<"输入有误！请重新输入: ";
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cin>>*(p[i].score+j);
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cin.get();
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}
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while(*(p[i].score+j)>100||*(p[i].score+j)<0)
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{
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cout<<setfill('=')<<setw(25);
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cout<<"输入有误，请输入0到100之内的数：";
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cin>>*(p[i].score+j);
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cin.get();
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while(!cin.good())
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{
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cin.clear();
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cin.sync();
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cout<<"输入有误！请重新输入: ";
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cin>>*(p[i].score+j);
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cin.get();
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}
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}
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}
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system("pause");
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system("cls");
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}
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}
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void show(student p[], string c_name[],int s_num,int c_num)
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{
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cout<<"********************************************************************************";
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cout<<"科目：\t\t";
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for(int j=0;j<c_num;j++)
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cout<<"\t"<<c_name[j];
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cout<<endl;
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cout<<"********************************************************************************";
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for(int i=0;i<s_num;i++)
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{
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cout<<p[i].classnum<<"班："<<p[i].name<<":";
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if(isalpha(p[i].name[0]))
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cout<<"\t\t";
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else
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cout<<"\t";
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for(int j=0;j<c_num;j++)
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cout<<*(p[i].score+j)<<"\t";
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cout<<endl;
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cout<<"********************************************************************************";
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}
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system("pause");
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system("cls");
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}
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void statistic(student p[], string c_name[],int s_num,int c_num)
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{
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int sum,ave,max,min,pass,trigger,cl_num;
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double pass_rate;
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for(int i=0;i<c_num;i++)
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{
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cout<<"【"<<c_name[i]<<"科目】"<<endl;
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for(int k=0;k<s_num;k++)
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{
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sum=0;
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trigger=0;
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ave=0;
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cl_num=0;
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pass_rate=0;
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pass=0;
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max=*(p[k].score+i);
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min=*(p[k].score+i);
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int j;
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for(j=0;j<k;j++)
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if(strcmp(p[k].classnum,p[j].classnum)==0)
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trigger=1;
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if(trigger==1)
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continue;
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for(j=k;j<s_num;j++)
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{
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if(strcmp(p[k].classnum,p[j].classnum)==0)
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{
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sum+=*(p[j].score+i);
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cl_num++;
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if((*p[j].score+i)>max)
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max=*(p[j].score+i);
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if((*p[j].score+i)<min)
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min=*(p[j].score+i);
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if(*(p[j].score+i)>=60)
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pass++;
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}
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}
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cout<<"《"<<p[k].classnum<<"班》"<<endl;
|
|
|
cout<<"********************************************************************************";
|
|
|
cout<<"总分为："<<sum<<" ";
|
|
|
ave=sum/cl_num;
|
|
|
cout<<"平均分为："<<ave<<" ";
|
|
|
cout<<"最高分为："<<max<<" ";
|
|
|
cout<<"最低分为："<<min<<" ";
|
|
|
pass_rate=(1.0*pass)/cl_num;
|
|
|
cout<<"及格率为："<<pass_rate*100<<"%"<<endl;
|
|
|
cout<<"********************************************************************************";
|
|
|
}
|
|
|
}
|
|
|
system("pause");
|
|
|
system("cls");
|
|
|
}
|
|
|
void section(student p[], string c_name[],int s_num,int c_num)
|
|
|
{
|
|
|
int s_nopass,s_60,s_70,s_80,s_90,trigger;
|
|
|
for(int i=0;i<c_num;i++)
|
|
|
{
|
|
|
cout<<"【"<<c_name[i]<<"】";
|
|
|
for(int k=0;k<s_num;k++)
|
|
|
{
|
|
|
trigger=0;
|
|
|
s_nopass=0;
|
|
|
s_60=0;
|
|
|
s_70=0;
|
|
|
s_80=0;
|
|
|
s_90=0;
|
|
|
for(int j=0;j<k;j++)
|
|
|
if(strcmp(p[k].classnum,p[j].classnum)==0)
|
|
|
trigger=1;
|
|
|
if(trigger==1)
|
|
|
continue;
|
|
|
for(int j=k;j<s_num;j++)
|
|
|
{
|
|
|
if(strcmp(p[k].classnum,p[j].classnum)==0)
|
|
|
{
|
|
|
if(*(p[j].score+i)>=90)
|
|
|
s_90++;
|
|
|
else if(*(p[j].score+i)>=80)
|
|
|
s_80++;
|
|
|
else if(*(p[j].score+i)>=70)
|
|
|
s_70++;
|
|
|
else if(*(p[j].score+i)>=60)
|
|
|
s_60++;
|
|
|
else if(*(p[j].score+i)<60)
|
|
|
s_nopass++;
|
|
|
}
|
|
|
}
|
|
|
cout<<endl;
|
|
|
cout<<"《"<<p[k].classnum<<"班》"<<endl;
|
|
|
cout<<"********************************************************************************";
|
|
|
cout<<"不及格："<<s_nopass<<" 人 ";
|
|
|
cout<<"60至70分："<<s_60<<" 人 ";
|
|
|
cout<<"70至80分："<<s_70<<" 人 ";
|
|
|
cout<<"80至90分："<<s_80<<" 人 ";
|
|
|
cout<<"90至100分："<<s_90<<" 人 "<<endl;
|
|
|
cout<<"********************************************************************************";
|
|
|
}
|
|
|
}
|
|
|
system("pause");
|
|
|
system("cls");
|
|
|
}
|
|
|
void search(student p[], string c_name[],int s_num,int c_num)
|
|
|
{
|
|
|
char name_or_id[SIZE];
|
|
|
cout<<"请输入学号或名字：";
|
|
|
cin.get(name_or_id,SIZE);
|
|
|
cin.get();
|
|
|
while(!cin.good())
|
|
|
{
|
|
|
cin.clear();
|
|
|
cin.sync();
|
|
|
cout<<"输入有误！请重新输入: ";
|
|
|
cin.get(name_or_id,SIZE);
|
|
|
cin.get();
|
|
|
}
|
|
|
cout<<"********************************************************************************";
|
|
|
int n=0;
|
|
|
for(int i=0;i<s_num;i++)
|
|
|
{
|
|
|
if(strcmp(p[i].name,name_or_id)==0||strcmp(p[i].id,name_or_id)==0)
|
|
|
{
|
|
|
n++;
|
|
|
cout<<"学号"<<p[i].id<<"的"<<p[i].name<<"同学的成绩如下："<<endl;
|
|
|
cout<<"********************************************************************************";
|
|
|
for(int j=0;j<c_num;j++)
|
|
|
cout<<c_name[j]<<"科目："<<*(p[i].score+j)<<"分"<<" ";
|
|
|
cout<<endl;
|
|
|
cout<<"********************************************************************************";
|
|
|
}
|
|
|
}
|
|
|
if(n==0)
|
|
|
cout<<"没有这名同学的信息。"<<endl;
|
|
|
system("pause");
|
|
|
system("cls");
|
|
|
}
|
|
|
void sort(student p[], string c_name[],int s_num,int c_num)
|
|
|
{
|
|
|
int *score_s=new int[s_num];
|
|
|
for(int i=0;i<c_num;i++)
|
|
|
{
|
|
|
for(int j=0;j<s_num;j++)
|
|
|
score_s[j]=*(p[j].score+i);
|
|
|
quicksort(score_s,0,s_num-1);
|
|
|
cout<<"【"<<c_name[i]<<"】由高到低的分数排序如下："<<endl;
|
|
|
cout<<"********************************************************************************";
|
|
|
for(int j=0;j<s_num;j++)
|
|
|
cout<<score_s[j]<<"分 ";
|
|
|
cout<<endl;
|
|
|
cout<<"********************************************************************************";
|
|
|
}
|
|
|
system("pause");
|
|
|
system("cls");
|
|
|
delete[] score_s;
|
|
|
}
|
|
|
void update(student p[], string c_name[],int s_num,int c_num)
|
|
|
{
|
|
|
char name_or_id[SIZE];
|
|
|
cout<<"请输入学号或名字：";
|
|
|
cin.get(name_or_id,SIZE);
|
|
|
cin.get();
|
|
|
char ch;
|
|
|
int n=0;
|
|
|
for(int i=0;i<s_num;i++)
|
|
|
{
|
|
|
if(strcmp(p[i].name,name_or_id)==0||strcmp(p[i].id,name_or_id)==0)
|
|
|
{
|
|
|
n++;
|
|
|
cout<<"请选择要执行的操作："<<endl;
|
|
|
cout<<"********************************************************************************";
|
|
|
cout<<"(a)更新学生的基本信息 (b)更新学生的成绩"<<endl;
|
|
|
cout<<"(q)结束"<<endl;
|
|
|
cout<<"********************************************************************************";
|
|
|
cout<<"输入：";
|
|
|
cin.get(ch);
|
|
|
cin.get();
|
|
|
cout<<"********************************************************************************";
|
|
|
if(ch!='q')
|
|
|
{
|
|
|
if(ch=='a')
|
|
|
{
|
|
|
cout<<"请输入其班级（例如：自动化1122）：";
|
|
|
cin.get(p[i].classnum,SIZE);
|
|
|
cin.get();
|
|
|
cout<<"********************************************************************************";
|
|
|
while(!cin.good())
|
|
|
{
|
|
|
cin.clear();
|
|
|
cin.sync();
|
|
|
cout<<"输入有误！请重新输入: ";
|
|
|
cin.get(p[i].classnum,SIZE);
|
|
|
cin.get();
|
|
|
cout<<"********************************************************************************";
|
|
|
}
|
|
|
cout<<"请输入其学号：";
|
|
|
cin.get(p[i].id,SIZE);
|
|
|
cin.get();
|
|
|
cout<<"********************************************************************************";
|
|
|
while(!cin.good())
|
|
|
{
|
|
|
cin.clear();
|
|
|
cin.sync();
|
|
|
cout<<"输入有误！请重新输入: ";
|
|
|
cin.get(p[i].id,SIZE);
|
|
|
cin.get();
|
|
|
cout<<"********************************************************************************";
|
|
|
}
|
|
|
for(int k=0;k<s_num;k++)
|
|
|
{
|
|
|
if(k==i)
|
|
|
k++;
|
|
|
if(strcmp(p[k].id,p[i].id)==0)
|
|
|
{
|
|
|
cout<<"与已有学生的学号重复，请重新输入："<<endl;
|
|
|
cin.get(p[i].id,SIZE);
|
|
|
cin.get();
|
|
|
cout<<"********************************************************************************";
|
|
|
while(!cin.good())
|
|
|
{
|
|
|
cin.clear();
|
|
|
cin.sync();
|
|
|
cout<<"输入有误！请重新输入: ";
|
|
|
cin.get(p[i].id,SIZE);
|
|
|
cin.get();
|
|
|
cout<<"********************************************************************************";
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
cout<<"请输入其姓名：";
|
|
|
cin.getline(p[i].name,SIZE);
|
|
|
cout<<"********************************************************************************";
|
|
|
while(!cin.good())
|
|
|
{
|
|
|
cin.clear();
|
|
|
cin.sync();
|
|
|
cout<<"输入有误！请重新输入: ";
|
|
|
cin.getline(p[i].name,SIZE);
|
|
|
cout<<"********************************************************************************";
|
|
|
}
|
|
|
}
|
|
|
else if(ch=='b')
|
|
|
{
|
|
|
for(int j=0;j<c_num;j++)
|
|
|
{
|
|
|
cout<<"请输入"<<c_name[j]<<"的成绩：";
|
|
|
cin>>*(p[i].score+j);
|
|
|
cin.get();
|
|
|
cout<<"********************************************************************************";
|
|
|
while(!cin.good())
|
|
|
{
|
|
|
cin.clear();
|
|
|
cin.sync();
|
|
|
cout<<"输入有误！请重新输入: ";
|
|
|
cin>>*(p[i].score+j);
|
|
|
cin.get();
|
|
|
cout<<"********************************************************************************";
|
|
|
}
|
|
|
while(*(p[i].score+j)>100||*(p[i].score+j)<0)
|
|
|
{
|
|
|
cout<<"输入有误，请输入0到100之内的数：";
|
|
|
cin>>*(p[i].score+j);
|
|
|
cin.get();
|
|
|
while(!cin.good())
|
|
|
{
|
|
|
cin.clear();
|
|
|
cin.sync();
|
|
|
cout<<"输入有误！请重新输入: ";
|
|
|
cin>>*(p[i].score+j);
|
|
|
cin.get();
|
|
|
cout<<"********************************************************************************";
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
cout<<"输入有误，请重新输入：";
|
|
|
cin.get(ch);
|
|
|
cin.get();
|
|
|
cout<<"********************************************************************************";
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
if(n==0)
|
|
|
{
|
|
|
cout<<"没有这名同学。"<<endl;
|
|
|
cout<<"********************************************************************************";
|
|
|
}
|
|
|
system("pause");
|
|
|
system("cls");
|
|
|
}
|
|
|
void fileout(student p[], string c_name[],int s_num,int c_num,int semester)
|
|
|
{
|
|
|
ofstream fout;
|
|
|
char fname[SIZE];
|
|
|
char _fname1[SIZE]="basic_";
|
|
|
char _fname2[SIZE]="course_";
|
|
|
char _fname3[SIZE]="student_";
|
|
|
cout<<"请输入要保存的文件名(需要加上后缀.txt)：";
|
|
|
cin.getline(fname,SIZE);
|
|
|
strcat(_fname1,fname);
|
|
|
strcat(_fname2,fname);
|
|
|
strcat(_fname3,fname);
|
|
|
fout.open(fname);
|
|
|
for(int i=0;i<s_num;i++)
|
|
|
{
|
|
|
fout<<"********************************************************************************"<<endl;
|
|
|
fout<<"【个人信息】";
|
|
|
fout<<"姓名："<<p[i].name<<" "<<"班级："<<p[i].classnum<<"班 "<<"学号："<<p[i].id<<endl;
|
|
|
fout<<"********************************************************************************"<<endl;
|
|
|
fout<<"【成绩】";
|
|
|
for(int j=0;j<c_num;j++)
|
|
|
fout<<c_name[j]<<"："<<*(p[i].score+j)<<" ";
|
|
|
fout<<endl;
|
|
|
fout<<"********************************************************************************"<<endl;
|
|
|
fout<<endl;
|
|
|
}
|
|
|
fout.close();
|
|
|
fout.open(_fname1);
|
|
|
fout<<s_num<<endl;
|
|
|
fout<<semester<<endl;
|
|
|
fout<<c_num<<endl;
|
|
|
fout.close();
|
|
|
fout.open(_fname2);
|
|
|
for(int i=0;i<c_num;i++)
|
|
|
{
|
|
|
fout<<c_name[i]<<endl;
|
|
|
}
|
|
|
fout.close();
|
|
|
fout.open(_fname3);
|
|
|
for(int i=0;i<s_num;i++)
|
|
|
{
|
|
|
fout<<p[i].classnum<<endl;
|
|
|
fout<<p[i].id<<endl;
|
|
|
fout<<p[i].name<<endl;
|
|
|
for(int j=0;j<c_num;j++)
|
|
|
{
|
|
|
fout<<*(p[i].score+j)<<endl;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
cout<<"已输出到"<<fname<<"中。"<<endl;
|
|
|
system("pause");
|
|
|
system("cls");
|
|
|
}
|
|
|
void quicksort(int s[],int l,int r)
|
|
|
{
|
|
|
if(l<r)
|
|
|
{
|
|
|
int i=l,j=r,x=s[l];
|
|
|
while(i<j)
|
|
|
{
|
|
|
while(i<j&&s[j]<=x)
|
|
|
j--;
|
|
|
if(i<j)
|
|
|
s[i++]=s[j];
|
|
|
while(i<j&&s[i]>=x)
|
|
|
i++;
|
|
|
if(i<j)
|
|
|
s[j--]=s[i];
|
|
|
}
|
|
|
s[i]=x;
|
|
|
quicksort(s,l,i-1);
|
|
|
quicksort(s,i+1,r);
|
|
|
}
|
|
|
}
|
|
|
|
