在不知道学生人数和每个学生课程数量的情况下对学生的平均成绩排序

#include <iostream>
#include <sstream>
#include <vector>
#include <algorithm>
using namespace std;

typedef struct {
	string name;
	int ave;
}Stu;
vector<Stu> vec;
int cmp(const Stu& lhs, const Stu& rhs)
{
	return lhs.ave > rhs.ave;
}
int main() {
	string line;
	stringstream ss;
	while (getline(cin, line) && line != "") 
	{
		Stu s;
		int cnt = 0;
		double sum = 0.0;
		double score;
		ss.clear();
		ss << line;
		//cout << ss << endl;
		ss >> s.name;
		//cout << s.name << endl;
		while (ss >> score) 
		{
			sum += score;
			cnt++;
		}
		s.ave = (int)(sum / (double)cnt + 0.5);//这里+0.5的意思是如果4舍5入
		//cout << s.ave << endl;
		vec.push_back(s);
	}
	sort(vec.begin(), vec.end(),cmp);
	for (int i = 0; i < vec.size(); ++i) 
	{
		cout << vec[i].name << " " << vec[i].ave << endl;
	}
	return 0;
}