相关知识点运用：
如下图所示，为学生的出勤情况（从左至右，每一列表示一个学生，1~25号）
下图是学生出勤情况表数据 （可直接复制到student.txt文件中）
1111111111111111111111111
1110111011101110111011100
1101101101101101101101101
1111011110111101111011110
0011101110111101111101111
0011101111011111110111111
1111101111110111111100111
1100111110001111111111110
1111111111111101111111111
1111011111011111111110111
1
2
3
4
5
6
7
8
9
10
代码实现
#include
#include
#include
#include
#include
#include
#define N 25
using namespace std;
class Student
{
public:
int id;
int attend;
Student(int id,int attend) :id(id), attend(attend) {}
friend ostream& operator << (ostream& os, const Student& s)
{
os << s.id << '\t' << s.attend << endl;
return os;
}
};
class Sort
{
public :
vector& student;
Sort(vector& student) :student(student){}
bool operator() (Student a,Student b){
return a.attend < b.attend;
}
};
void count()
{
vector stu;
vector > bit;
string str;
for (int i = 1; i < N + 1; i++)
{
Student s(i, 0);
stu.push_back(s);
}
ifstream in("student.txt"); //读
if (!in)
{
cout << " open failed" << endl;
return;
}
while (getline(in, str))
{
bitsetb(str);
bit.push_back(b);
}
for (int i = 0; i < bit.size(); i++)
{
for (int j = 0; j < stu.size(); j++)
{
if (bit[i].test(j) == 1)
{
stu[j].attend++;
}
}
}
cout<< '\t' << "id" << '\t' << "attend" << endl;
sort(stu.begin(), stu.end(),Sort(stu));
cout << "\t";
copy(stu.begin(), stu.end(), ostream_iterator(cout, "\t"));
for (int i = stu.size()-1; i > stu.size() - 4; i--)
{
cout << stu.at(i).id <<" ";
}
cout << "三名同学获得小红花" << endl;
}
int main()
{
count();
system("pause");
return 0;
}
运行结果截图
