注意输入输出格式

#include<iostream>
#include<cstdio>
#include<vector>
using namespace std;
typedef struct Node{
	string sno;
	string cname;
	string name;
	double grade[3];
	double ave;
}node;
int main()
{
	int N;
	cin >> N;
	vector<node> vstu;
	for (int i = 0; i < N; i++) {
		node stu;
		cin >> stu.sno >> stu.cname >> stu.name;
		double sum = 0;
		for (int j = 0; j < 3; j++) {
			cin >> stu.grade[j];
			sum += stu.grade[j];
		}
		stu.ave = sum / 3.0;
		vstu.push_back(stu);
	}
	double max = 0;
	int index = -1;
	for (int i = 0; i < N; i++) {
		cout << vstu[i].name;
		printf(" %.1f\n", vstu[i].ave);
		if (vstu[i].ave > max) {
			max = vstu[i].ave;
			index = i;
		}
	}
	cout << vstu[index].sno << " " << vstu[index].cname << " " << vstu[index].name << " ";
	for (int i = 0; i < 3; i++) {
		printf("%.1f ", vstu[index].grade[i]);
	}
	printf("%....